# Marine Shrimp Broodstock Maturation ## Key Takeaways - Broodstock sourcing requires rigorous verification of disease-free status, utilizing resources like the FAO cultured species database, to mitigate risks of introducing pathogens such as White Spot Syndrome Virus (WSSV), Taura Syndrome Virus (TSV), and Infectious Hypodermal and Hematopoietic Necrosis Virus (IHHNV) through methods like PCR screening. - Optimal maturation diets combine natural feeds (squid, polychaetes, mussel) with formulated pellets enriched in phospholipids and highly unsaturated fatty acids (HUFA), crucial for ovary development and egg quality, with feeding frequency at 4-6 times daily at 5-10% of body weight. - Unilateral eyestalk ablation, a technique to remove gonad-inhibiting hormone, is performed on mature females using cauterization or ligation under anesthetic protocols to reduce stress and pain, though welfare concerns necessitate trained personnel and exploration of alternatives. - Environmental conditioning is critical, maintaining stable parameters such as temperature (28-30°C), salinity (28-32 ppt), dissolved oxygen (>5 mg/L), and pH (7.8-8.2), with photoperiod control (12-14 hours light) mimicking natural cycles to stimulate reproductive readiness. - Comprehensive biosecurity protocols, including a minimum 14-day quarantine for new broodstock, dedicated equipment, UV or ozone water treatment, and regular pathogen screening, are essential to prevent vertical transmission of diseases to gametes and embryos. - Performance indicators such as spawning frequency (3-7 days post-ablation), fecundity (100,000-500,000 eggs/spawn), fertilization rate (70-90%), and hatch rate (60-80%) are vital for monitoring broodstock health and guiding management decisions, with professional escalation to veterinarians recommended for disease outbreaks or persistent reproductive failures. --- Marine shrimp broodstock maturation is the controlled process of conditioning adult Penaeid shrimp to achieve reproductive readiness, produce viable gametes, and support hatchery seed production. This guide covers broodstock sourcing, environmental conditioning, maturation diets, eyestalk ablation, and spawning induction for hatchery managers and technicians. The content is based on published research and official sources from the Food and Agriculture Organization (FAO), USDA Agricultural Research Service, and peer-reviewed journals. ## At a Glance | Parameter | Recommended Practice | Key Consideration | |-----------|---------------------|-------------------| | Broodstock source | Wild-caught or captive-reared from certified disease-free stocks | Source verification reduces disease introduction risk, FAO cultured species database provides guidance on species selection | | Maturation diet | Combination of fresh or frozen natural feeds (squid, polychaetes, mussel) and formulated maturation pellets | Phospholipid content in diets influences ovary development in female Pacific white shrimp | | Eyestalk ablation | Unilateral eyestalk ablation of females using cauterization or ligation | Performed only on mature females, welfare considerations require trained personnel and anesthetic protocols | | Spawning induction | Environmental cues: temperature 28-30°C, salinity 28-32 ppt, photoperiod 12-14 hours light | Water quality parameters must be stable, biofloc systems may affect reproduction and hemato-immunology | | Biosecurity | Quarantine new broodstock minimum 14 days, UV or ozone water treatment, dedicated equipment per tank | Disease prevention for gametes and embryos requires comprehensive protocols | | Records | Daily water quality, feed consumption, weekly maturation stage, per-spawn egg quality | Performance indicators guide management decisions | ## Broodstock Sourcing and Selection ### Species Selection Criteria Marine shrimp hatcheries typically work with Penaeus vannamei (Pacific white shrimp), Penaeus monodon (giant tiger prawn), Penaeus merguiensis (banana shrimp), and other commercially important species. The FAO cultured species database provides information on suitable species for different regions and production systems. Selection depends on market demand, local environmental conditions, and disease resistance profiles. Hatchery managers must evaluate which species matches their facility capabilities and target markets before committing to broodstock acquisition. ### Source Verification Broodstock can be sourced from wild populations or captive breeding programs. Wild-caught broodstock offer genetic diversity but carry higher disease risk. Captive-reared stocks from specific pathogen-free (SPF) programs reduce disease introduction but may have lower reproductive performance. Recent developments in penaeid broodstock and seed production technologies have improved the outlook for superior captive stocks. Hatchery managers should maintain records of broodstock origin, health status, and genetic lineage. Each source has tradeoffs that affect long-term hatchery productivity and biosecurity risk. ### Health Screening Before introducing broodstock to maturation facilities, quarantine and health screening are essential. Disease prevention and control for gametes and embryos of fish and marine shrimp requires rigorous biosecurity protocols. Screening should target common pathogens including [white spot syndrome virus](/knowledge/viruses/aquatic-viruses/white-spot-syndrome-virus) (WSSV), [Taura syndrome virus](/knowledge/viruses/aquatic-viruses/taura-syndrome-virus) (TSV), and [infectious hypodermal and hematopoietic necrosis virus](/knowledge/viruses/aquatic-viruses/infectious-hypodermal-hematopoietic-necrosis-virus) (IHHNV). The USDA National Agricultural Library's Animal Health and Welfare resources provide guidance on disease surveillance protocols. Health screening records must be maintained for each broodstock batch and reviewed before introduction to production areas. ## Maturation Facility Design and Environmental Conditioning ### Facility Requirements Maturation facilities require separate areas for male and female broodstock, controlled lighting systems, water treatment infrastructure, and spawning tanks. Water quality parameters must be maintained within species-specific ranges. Temperature control systems should maintain stability within 0.5°C of target. Salinity management requires reliable mixing and monitoring equipment. Facility design should allow for isolation of sick animals and prevent cross-contamination between tanks. The USDA Agricultural Research Service's aquaculture program provides resources on facility design considerations for broodstock management. ### Water Quality Management Stable water quality is critical for successful maturation. Key parameters include temperature 28-30°C for most Penaeid species, salinity 28-32 ppt, pH 7.8-8.2, dissolved oxygen above 5 mg/L, and total ammonia nitrogen below 0.1 mg/L. The biofloc system has been studied for its effects on water quality, reproduction, and hemato-immunology of Penaeus vannamei during broodstock maturation. Hatchery managers should evaluate whether biofloc technology is appropriate for their specific maturation protocols. Daily water quality records allow early detection of trends that may affect reproductive performance. ### Photoperiod Control Photoperiod manipulation influences reproductive readiness. A 12-14 hour light cycle with gradual dawn and dusk transitions mimics natural conditions. Light intensity should be 500-1000 lux at the water surface. Sudden changes in photoperiod can stress broodstock and delay maturation. Automated lighting systems with dimmers provide consistent photoperiod control. Record photoperiod settings and any deviations from target schedules. ## Maturation Diets and Nutrition ### Natural Feed Components Maturation diets typically include fresh or frozen natural feeds such as squid, polychaete worms (bloodworms, sandworms), mussel meat, and artemia biomass. These feeds provide essential fatty acids, proteins, and reproductive hormones. Gonad quality of banana shrimp male broodstock fed different natural diets has been studied, showing that diet composition directly affects sperm quality and quantity. Hatchery managers should source natural feeds from reliable suppliers and verify their nutritional quality through periodic analysis. ### Formulated Maturation Feeds Commercial maturation pellets are formulated with elevated levels of highly unsaturated fatty acids (HUFAs), particularly docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), as well as cholesterol and phospholipids. Effects and mechanism of different phospholipid diets on ovary development in female broodstock Pacific white shrimp demonstrate that phospholipid composition influences ovarian maturation and egg quality. Formulated feeds should be stored in cool, dry conditions and used within manufacturer-recommended timeframes to prevent nutrient degradation. ### Feeding Protocols Feed frequency should be 4-6 times daily at 5-10% of body weight per day. Feed composition should be 50-70% natural feeds and 30-50% formulated pellets. Feed size should be appropriate for broodstock mouth size, typically 3-5 mm pellets. Natural feeds stored at -20°C or below maintain nutritional quality. Pellets stored in cool, dry conditions prevent rancidity and mold growth. Record feed type, amount offered, and amount consumed at each feeding. ### Nutritional Monitoring Record feed consumption daily. Uneaten feed indicates overfeeding or health problems. Body weight and gonadosomatic index (GSI) should be monitored weekly. Nutritional deficiencies manifest as poor gonad development, low fecundity, or reduced hatch rates. Compare feed consumption patterns across tanks and time periods to identify trends. Adjust feeding rates based on observed consumption and reproductive performance. ## Eyestalk Ablation ### Purpose and Mechanism Unilateral eyestalk ablation removes the X-organ sinus gland complex, which produces gonad-inhibiting hormone (GIH). This procedure removes hormonal inhibition of ovarian maturation, allowing females to develop and spawn more frequently. The procedure is standard in commercial hatcheries but raises welfare concerns. Hatchery managers must weigh productivity benefits against animal welfare obligations and regulatory requirements. ### Ablation Techniques Two primary methods are used. Cauterization uses a heated blade or electrocautery device to sever and seal the eyestalk. Ligation involves tying a sterile suture around the eyestalk base until it detaches. Both methods require trained personnel and aseptic technique. Anesthesia using clove oil or MS-222 at appropriate concentrations reduces stress and pain. The USDA National Agricultural Library's Animal Health and Welfare resources provide information on ethical considerations in aquaculture. Personnel must be trained and certified in ablation techniques before performing the procedure independently. ### Welfare Considerations Eyestalk ablation is controversial due to animal welfare concerns. Alternatives being researched include hormonal induction and selective breeding for naturally maturing stocks. Hatcheries should use ablation only on mature females with developed ovaries, maintain strict hygiene to prevent infection, monitor ablated females for stress indicators, and consider adopting non-ablative methods where feasible. Record the number of females ablated, technique used, and any complications observed. ### Post-Ablation Care After ablation, females should be held in separate tanks with optimal water quality. Antibiotic treatment may be necessary to prevent infection, but withdrawal periods must be observed. Females typically resume feeding within 24 hours and spawn within 3-7 days. Monitor ablated females for signs of infection, stress, or delayed recovery. Remove any females that show signs of severe stress or infection. ## Spawning Induction and Egg Collection ### Environmental Cues Spawning is induced by environmental manipulation including temperature increase of 1-2°C, water exchange of 50-100% with slightly cooler water, introduction of conditioned males, and photoperiod adjustment to simulate dusk conditions. These cues mimic natural spawning triggers and stimulate final oocyte maturation and ovulation. Record the specific cues used for each spawning event and the time between cue application and spawning. ### Spawning Behavior Mature females with fully developed ovaries (stage IV) are transferred to spawning tanks in the evening. Spawning typically occurs 6-12 hours after transfer. Males and females are usually separated after mating to prevent multiple spawns. Observe spawning behavior and record any abnormalities such as incomplete spawning or delayed spawning. ### Egg Collection Eggs are collected using fine mesh nets (100-200 micron) or by draining spawning tanks through collection screens. Eggs should be rinsed with clean seawater and transferred to hatching tanks. Egg quality assessment includes fertilization rate (percentage of eggs showing [cell division](/blog/guides/cell-division)), hatch rate (percentage of eggs that produce nauplii), and egg diameter measured under microscope. Record egg quality parameters for each spawn to track female performance over time. ### Spawning Records Maintain individual female records including female identification number, date of ablation, date of spawning, number of eggs produced, fertilization rate, hatch rate, and larval quality observations. These records allow identification of top-performing females and early detection of declining reproductive performance. Review spawning records weekly to identify trends and adjust management practices. ## Disease Prevention and Biosecurity ### Facility Biosecurity Disease prevention and control for gametes and embryos of fish and marine shrimp requires comprehensive biosecurity protocols. Key measures include footbaths and handwashing stations at facility entrances, dedicated equipment for each tank, UV or ozone water treatment, quarantine of new broodstock for minimum 14 days, and regular health monitoring by trained personnel. The USDA National Agricultural Library's Animal Health and Welfare resources provide guidance on biosecurity planning. Document all biosecurity measures and train all personnel in their proper implementation. ### Pathogen Screening Broodstock should be screened for specific pathogens before entering maturation facilities. Common screening targets include [white spot syndrome virus](/knowledge/viruses/aquatic-viruses/white-spot-syndrome-virus) (WSSV), [Taura syndrome virus](/knowledge/viruses/aquatic-viruses/taura-syndrome-virus) (TSV), [infectious hypodermal and hematopoietic necrosis virus](/knowledge/viruses/aquatic-viruses/infectious-hypodermal-hematopoietic-necrosis-virus) (IHHNV), [yellow head virus](/knowledge/viruses/aquatic-viruses/yellow-head-virus) (YHV), and Vibrio species. Screening frequency should be based on local disease prevalence and facility history. Maintain records of all screening results and actions taken in response to positive findings. ### Disinfection Protocols Disinfection of Perinereis aibuhitensis eggs with peroxymonosulfate to eliminate covert mortality nodavirus (CMNV) demonstrates the importance of egg disinfection in preventing vertical disease transmission. Hatchery managers should implement disinfection protocols for all incoming water, equipment, and feed items. Record disinfection procedures, chemical concentrations, and contact times for each batch. ### Worker Safety Workers handling broodstock and performing ablation should wear appropriate personal protective equipment (PPE) including gloves, aprons, and eye protection. Needles and sharp instruments require proper disposal. Chemical disinfectants must be used according to manufacturer safety data sheets. Train all personnel in safe handling procedures and emergency response protocols. Maintain a first aid kit and emergency contact information in the facility. ## Records and Measurements ### Essential Records | Record Type | Frequency | Purpose | |-------------|-----------|---------| | Water quality parameters | Daily | Monitor environmental stability | | Feed consumption | Daily | Assess nutritional status | | Female maturation stage | Weekly | Track ovarian development | | Spawning events | Per event | Document reproductive output | | Egg quality | Per spawn | Evaluate fertilization and hatch rates | | Health observations | Daily | Detect disease early | | Ablation procedures | Per procedure | Track technique and complications | ### Maturation Stage Classification Female ovarian development is classified into stages. Stage I is undeveloped with translucent ovaries. Stage II is early development with slight yellow coloration. Stage III is late development with dark green or orange coloration. Stage IV is fully mature with swollen ovaries visible through carapace. Record maturation stage for each female weekly using a standardized classification system. Train all technicians in consistent stage identification. ### Performance Indicators Key performance indicators for maturation success include spawning frequency of 3-7 days post-ablation, fecundity of 100,000-500,000 eggs per spawn depending on species and female size, fertilization rate of 70-90% in well-managed systems, hatch rate of 60-80% of fertilized eggs, and nauplii production of 50,000-300,000 per female per spawn. Compare performance indicators against facility benchmarks and published ranges. Investigate deviations from expected performance. ## Common Failure Patterns ### Poor Gonad Development Causes include inadequate nutrition, suboptimal water quality, stress from handling, or genetic factors. Solutions involve reviewing diet composition, checking water parameters, reducing handling frequency, and sourcing broodstock from different lines. Record gonad development scores for each female and compare across diet treatments and environmental conditions. ### Low Fertilization Rates May result from poor male quality, improper mating conditions, or environmental stress. Male broodstock should be evaluated for sperm quality. Mating ratios of 1 male to 2-3 females are typical. Water temperature and salinity must be within optimal ranges during mating. Record fertilization rates for each spawn and investigate when rates fall below 70%. ### High Egg Mortality Causes include bacterial or fungal infection, poor water quality, or mechanical damage during collection. Egg disinfection protocols should be reviewed. Water quality in spawning tanks must be maintained at optimal levels. Record egg mortality rates and investigate when rates exceed 30%. ### Disease Outbreaks Disease prevention and control for gametes and embryos of fish and marine shrimp requires immediate isolation of affected animals. Quarantine protocols must be followed. Veterinary consultation is recommended for disease diagnosis and treatment planning. Record all disease events, treatments applied, and outcomes. ## Limitations and Professional Escalation ### Technical Limitations Maturation success depends on multiple interacting factors. Even with optimal management, some females may not respond to ablation or environmental cues. Genetic factors, age, and prior health history influence individual performance. Hatchery managers should maintain realistic expectations and plan for variable production. Document limitations encountered and adjust protocols accordingly. ### When to Escalate Professional escalation is required when disease outbreaks affect more than 10% of broodstock, mortality rates exceed 5% per week, fertilization rates remain below 50% for two consecutive spawns, water quality cannot be maintained within acceptable ranges, or abnormal behavior or physical abnormalities appear in multiple animals. Contact a veterinarian or aquaculture specialist when these thresholds are exceeded. ### Veterinary Consultation Veterinary involvement is necessary for disease diagnosis, treatment recommendations, and regulatory compliance. The USDA Agricultural Research Service's aquaculture program provides resources for disease management. Local veterinary diagnostic laboratories can perform pathogen testing and histopathology. Maintain contact information for veterinary services and diagnostic laboratories. ### Regulatory Compliance Hatcheries must comply with local, national, and international regulations regarding animal welfare standards for ablation procedures, use of antibiotics and other veterinary drugs, discharge of wastewater from maturation facilities, and transport and sale of broodstock and larvae. The FAO Animal Production and Health resources provide guidance on regulatory frameworks. Review regulatory requirements annually and update protocols as needed. ## Practical Decision Framework for Broodstock Replacement and Culling ### Replacement Timing Criteria Broodstock replacement decisions directly affect hatchery productivity and operating costs. Female Pacific white shrimp typically produce viable spawns for 2 to 4 weeks after ablation, with peak egg quality occurring during the first 7 to 14 days. After this period, fecundity declines and fertilization rates drop below acceptable thresholds. Hatchery managers should establish clear replacement triggers based on measurable performance data instead of calendar schedules alone. Replace females when individual spawn records show fertilization rates below 60 percent for two consecutive spawns, hatch rates below 50 percent, or egg production falling below 50,000 eggs per spawn for smaller females or 100,000 for larger specimens. Male broodstock require replacement every 4 to 6 weeks or when spermatophore quality declines, indicated by reduced sperm count or motility observed under microscope. The FAO cultured species database provides species-specific guidance on reproductive cycles and expected productive lifespans for different Penaeid species. ### Culling Decision Matrix Develop a standardized culling matrix that combines multiple performance indicators into a single replacement score. Assign points for each criterion: fertilization rate below 60 percent (2 points), hatch rate below 50 percent (2 points), egg production below species-specific minimum (2 points), visible physical deterioration such as carapace lesions or limb loss (3 points), disease symptoms (4 points), and failure to spawn within 10 days post-ablation (3 points). Cull any female scoring 6 or more points within a single evaluation period. This systematic approach removes subjective decision-making and ensures consistent broodstock quality across the facility. Record culling decisions and the specific criteria that triggered each removal. Review culling patterns monthly to identify systemic issues such as diet deficiencies or water quality problems that may be accelerating broodstock decline. ### Record System for Individual Female Performance Maintain individual female records using a standardized form or database that tracks each animal from introduction through culling. Essential fields include female identification number, source and date of arrival, date of ablation, ablation method used, spawn dates and times, egg count per spawn, fertilization rate, hatch rate, nauplii production, and culling date with reason. Record maturation stage at each weekly assessment using the four-stage classification system. The USDA Agricultural Research Service's aquaculture program resources emphasize the importance of individual tracking for genetic improvement programs and performance benchmarking. Review individual records weekly to identify top-performing females that may be candidates for selective breeding programs. Compare performance across source populations to inform future broodstock purchasing decisions. ### Troubleshooting Declining Reproductive Output When reproductive output declines across multiple females simultaneously, investigate environmental factors before assuming individual animal problems. Check water temperature stability over the previous 7 days, as fluctuations exceeding 1 degree Celsius can disrupt ovarian maturation. Verify salinity remains within 28 to 32 parts per thousand and has not drifted outside this range. Review feed consumption records for the previous 2 weeks, noting any reduction in intake that may indicate feed palatability issues or nutritional degradation. Examine natural feed quality, particularly frozen squid and polychaetes, for signs of freezer burn or spoilage. The study on effects and mechanism of different phospholipid diets on ovary development in female broodstock Pacific white shrimp demonstrates that dietary phospholipid composition directly influences ovarian maturation, so verify that formulated feeds have been stored properly and used within manufacturer-recommended timeframes. If environmental and nutritional factors appear normal, consider disease screening for subclinical infections that may impair reproductive function without causing visible mortality. ### Common Failure Patterns in Broodstock Management Delayed first spawn beyond 10 days post-ablation indicates inadequate pre-ablation maturation, suboptimal water quality, or nutritional deficiencies. Review the female's maturation stage at ablation and ensure only stage III or IV females receive the procedure. Check that water temperature remained at 28 to 30 degrees Celsius during the post-ablation period. Low fertilization rates below 60 percent suggest poor male quality, improper mating ratios, or environmental stress during mating. Verify that male broodstock are producing viable spermatophores and that the male-to-female ratio is maintained at 1 male per 2 to 3 females. High egg mortality exceeding 30 percent before hatching indicates bacterial contamination, mechanical damage during collection, or poor egg quality from nutritional deficiencies. Review egg disinfection protocols and ensure collection nets are clean and handling is gentle. The disease prevention and control for gametes and embryos of fish and marine shrimp literature emphasizes that egg quality problems often trace back to broodstock nutrition instead of post-spawning factors. ### Professional Escalation Criteria Escalate to a veterinarian or aquaculture specialist when reproductive failure affects more than 30 percent of the broodstock population simultaneously, mortality rates exceed 5 percent per week, or visible disease signs appear in multiple animals. Contact a diagnostic laboratory when fertilization rates remain below 50 percent for two consecutive weeks across all females despite correcting environmental and nutritional factors. The USDA National Agricultural Library's Animal Health and Welfare resources provide contact information for veterinary diagnostic services and aquaculture extension specialists. Maintain a list of regional experts who can provide on-site consultation for persistent reproductive problems. Document all escalation actions and the specific criteria that triggered them to build a facility-specific troubleshooting history that informs future management decisions. ## Frequently Asked Questions ### What is the optimal temperature for marine shrimp broodstock maturation? Temperature requirements vary by species, but most Penaeid shrimp mature best at 28-30°C. Temperature stability is more important than absolute temperature. Fluctuations greater than 1°C per day can stress broodstock and reduce reproductive performance. Water quality parameters should be monitored daily and adjusted as needed. Record temperature at least twice daily and investigate any deviations from target range. ### How long does it take for ablated females to spawn? Ablated females typically spawn within 3-7 days after the procedure, depending on their initial maturation stage and environmental conditions. Females with fully developed ovaries (stage IV) at the time of ablation may spawn within 24-48 hours. Females at earlier stages require more time to complete ovarian development. Record the time between ablation and first spawn for each female to track individual response. ### What natural feeds are best for broodstock maturation? Common natural feeds include squid, polychaete worms (bloodworms, sandworms), mussel meat, and artemia biomass. Squid provides high levels of HUFAs and attractants. Polychaetes contain reproductive hormones and essential fatty acids. A combination of different natural feeds provides balanced nutrition. Gonad quality of banana shrimp male broodstock fed different natural diets shows that diet composition directly affects reproductive performance. Rotate feed types to provide nutritional variety. ### Can broodstock be reused for multiple spawns? Yes, female broodstock can produce multiple spawns after ablation. With proper nutrition and environmental management, females may spawn every 3-7 days for 2-4 weeks. After this period, reproductive output declines and females should be replaced. Male broodstock can be used for 4-6 weeks before replacement. Record spawn number and quality for each female to identify when replacement is needed. ### What are the welfare concerns with eyestalk ablation? Eyestalk ablation causes pain and stress to female shrimp. The procedure removes the X-organ sinus gland complex, which produces gonad-inhibiting hormone. Welfare concerns include surgical trauma, infection risk, and chronic stress. Alternatives being researched include hormonal induction and selective breeding for naturally maturing stocks. Hatcheries should use anesthesia, maintain strict hygiene, and monitor ablated females for signs of distress. The USDA National Agricultural Library's Animal Health and Welfare resources provide information on ethical considerations. ### How do I assess egg quality after spawning? Egg quality assessment includes fertilization rate (percentage of eggs showing [cell division](/blog/guides/cell-division)), hatch rate (percentage of eggs that produce nauplii), and egg diameter measured under microscope. Eggs should be examined within 2-4 hours after spawning to determine fertilization status. Poor egg quality may indicate nutritional deficiencies, environmental stress, or genetic factors. Record egg quality parameters for each spawn and compare across females and time periods. ### What biosecurity measures are essential for maturation facilities? Essential biosecurity measures include footbaths and handwashing stations at facility entrances, dedicated equipment for each tank, UV or ozone water treatment, quarantine of new broodstock for minimum 14 days, and regular health monitoring. Disease prevention and control for gametes and embryos of fish and marine shrimp requires comprehensive protocols. Disinfection of incoming water and feed items is critical. Train all personnel in biosecurity procedures and audit compliance regularly. ### When should I consult a veterinarian for broodstock problems? Veterinary consultation is necessary when disease outbreaks affect more than 10% of broodstock, mortality rates exceed 5% per week, fertilization rates remain below 50% for two consecutive spawns, or abnormal behavior appears in multiple animals. The USDA Agricultural Research Service's aquaculture program provides resources for disease management. Local veterinary diagnostic laboratories can perform pathogen testing and histopathology. Maintain contact information for veterinary services and diagnostic laboratories. ## Related Farming Guides - [Shrimp Farming Biosecurity Water Management And Crop Observation](/knowledge/animal-farming/aquaculture/shrimp-farming-biosecurity-water-management-and-crop-observation) - [Aquaculture Solids Management Settling Filtration Sludge And Disposal](/knowledge/animal-farming/aquaculture/aquaculture-solids-management-settling-filtration-sludge-and-disposal) - [Veal Production Systems Housing Nutrition And Welfare](/knowledge/animal-farming/beef-cattle/veal-production-systems-housing-nutrition-and-welfare) - [Freshwater Prawn Farming Stocking Shelter Feeding And Harvest Management](/knowledge/animal-farming/aquaculture/freshwater-prawn-farming-stocking-shelter-feeding-and-harvest-management) - [Rabbit Production Systems Intensive Semi Intensive Extensive](/knowledge/animal-farming/rabbits/rabbit-production-systems-intensive-semi-intensive-extensive) ## Related Clinical & Scientific Guides * [Pond Sediment Management and Dredging Options](/knowledge/animal-farming/aquaculture/pond-sediment-management-dredging-options) * [Indoor Aquaculture Facilities: Lighting and Insulation](/knowledge/animal-farming/aquaculture/indoor-aquaculture-facilities-lighting-insulation) * [Greenhouse Aquaculture: Extending Growing Seasons](/knowledge/animal-farming/aquaculture/greenhouse-aquaculture-extending-growing-seasons) ## References and Further Reading - [www.fao.org](https://www.fao.org/fishery/en/culturedspecies) - [www.ars.usda.gov](https://www.ars.usda.gov/animal-production-and-protection/aquaculture) - [FAO Animal Production and Health](https://www.fao.org/animal-production/en). Food and Agriculture Organization of the United Nations. - [Animal Health and Welfare](https://www.nal.usda.gov/animal-health-and-welfare). USDA National Agricultural Library. - [Does the Biofloc System Affect Water Quality, Reproduction, and Hemato-Immunology of Penaeus vannamei During Broodstock Maturation?](https://pubmed.ncbi.nlm.nih.gov/41375482). Animals : an open access journal from MDPI, 2025. - [Gonad Quality of Banana Shrimp Male Broodstock Penaeus merguiensis (De Man, 1888) Fed Different Natural Diets.](https://pubmed.ncbi.nlm.nih.gov/35966265). Tropical life sciences research, 2022. - [Effects and Mechanism of Different Phospholipid Diets on Ovary Development in Female Broodstock Pacific White Shrimp, Litopenaeus vannamei.](https://pubmed.ncbi.nlm.nih.gov/35252307). Frontiers in nutrition, 2022. - [Disease prevention and control for gametes and embryos of fish and marine shrimp](https://doi.org/10.1016/S0044-8486%2801%2900585-3). Aquaculture, 2001. - [Disinfection of Perinereis aibuhitensis eggs with peroxymonosulfate to eliminate covert mortality nodavirus (CMNV)](https://doi.org/10.1016/j.aquaculture.2023.739539). Aquaculture, 2023. - [Recent developments in penaeid broodstock and seed production technologies: Improving the outlook for superior captive stocks](https://doi.org/10.1016/S0044-8486%2898%2900174-4). Aquaculture, 1998. > This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.