Agriculture & EnvironmentISCO 6221
Aquaculture rearing technician
Aquaculture rearing technicians operate in aquatic organisms' production. They are specialists in the rearing, weaning and production of juveniles.
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Rate 5 of the 34 essential skills of this occupation (European ESCO data). No account needed.
monitor fish mortality rates
use water disinfection equipment
maintain the production of juveniles at the nursery stage
ensure compliance with aquaculture standards
monitor fish health status
About aquaculture rearing technician
As an aquaculture rearing technician, you will specialize in the propagation and early development of aquatic organisms, managing the critical juvenile stage where survival rates significantly impact overall farm productivity. Your work involves managing hatchery operations, inducing spawning in broodstock, monitoring larval development, and overseeing the weaning process from live food to formulated diets. You'll apply your knowledge of fish biology and plankton production to create optimal rearing conditions, requiring meticulous attention to water quality, disease prevention, and biosecurity protocols.
Key Work Functions
Core areas of responsibility for a aquaculture rearing technician.
1
Broodstock Management and Spawning Operations
- Condition and prepare broodstock through proper nutrition and environmental manipulation for spawning readiness
- Induce spawning and fertilisation in aquaculture species using hormonal or environmental triggers
- Manage capture and handling of broodstock to minimize stress and ensure reproductive success
2
Larval Rearing and Weaning
- Maintain optimal hatchery conditions including temperature, light, and water flow for larval development
- Handle and supervise the critical larval weaning process from live food to formulated diets
- Screen live fish for deformities and remove non-viable individuals to maintain population quality
3
Plankton and Feed Production
- Cultivate live plankton cultures (rotifers, copepods, artemia) as essential live feed for larvae
- Monitor and maintain optimal conditions for plankton production to ensure nutritional quality
- Transition larvae to formulated feeds while maintaining growth rates and survival
4
Health Monitoring and Biosecurity
- Monitor fish health status daily and detect signs of disease or stress early
- Monitor fish mortality rates and conduct pathological analysis to prevent disease outbreaks
- Maintain hatchery equipment and systems to prevent contamination and ensure biosecurity protocols
5
Production Management and Documentation
- Maintain records of spawning events, larval survival rates, and production metrics throughout rearing cycle
- Preserve fish samples for diagnostic purposes and disease identification
- Write work-related reports documenting hatchery operations, incidents, and production outcomes
European Skills Framework
Skills and knowledge areas required for this occupation based on European classification.
Essential (34)
aquaculture reproductionaquaculture reproductionThe techniques used to induce spawning, spawning on nests, stripping using appropriate techniques for specific species of fish, molluscs, crustaceans and others. The environmental control of spawning,...fish biologyfish biologyThe study of fish, shellfish or crustacean organisms, categorized into many specialised fields that cover their morphology, physiology, anatomy, behaviour, origins and distribution.plankton productionplankton productionThe methods, characteristics and equipment used to cultivate phytoplankton, microalgae and live prey such as rotifers or Artemia with advanced techniques.biosecuritybiosecurityBe aware of the general principles of the concept of bio-security and in particular, the disease prevention rules to be implemented in case of epidemics endangering public health.monitor fish mortality ratesmonitor fish mortality ratesMonitor fish mortalities and assess possible causes.use water disinfection equipmentuse water disinfection equipmentOperate equipment for water disinfection, using different methods and techniques, such as mechanical filtration, depending on needs.maintain the production of juveniles at the nursery stagemaintain the production of juveniles at the nursery stageMaintain the production of juveniles at the nursery stage using advanced high density production techniques.ensure compliance with aquaculture standardsensure compliance with aquaculture standardsEnsure that operations comply with standards for sustainable aquaculture.monitor fish health statusmonitor fish health statusMonitor the health of fish, based on feeding and general behaviour. Interpret environmental parameters and analyse mortalities.maintain aquaculture water quality in hatcheriesmaintain aquaculture water quality in hatcheriesMeasure flow of water in tanks and natural freshwater bodies. Measure parameters of water quality, such as pH, temperature, oxygen, salinity, CO2, N2, NO2, NH4, turbidity, and chlorophyll.induce spawning and fertilisation on aquaculture speciesinduce spawning and fertilisation on aquaculture speciesInduce spawning using appropriate techniques for specific cultured species of fish, molluscs, crustaceans or others. Determine sexual maturity of broodstock, using appropriate techniques as indicated ...maintain hatchery equipmentmaintain hatchery equipmentMake minor repairs to hatchery equipment as required.cultivate planktoncultivate planktonCultivate phytoplankton and microalgae. Cultivate live prey such as rotifers or Artemia with advanced techniques.handle larval weaning processhandle larval weaning processCarry out actions to raise species, such as gradually shift the nutrition of babies from live prey to dry substances.condition broodstockcondition broodstockIncubate eggs until hatching. Assess quality of eggs. Inspect fish eggs. Remove dead, unviable, and off-colour eggs using a suction syringe. Produce eyed eggs. Hatch and maintain new-born larvae.preserve fish samples for diagnosispreserve fish samples for diagnosisCollect and preserve larval, fish and mollusc samples or lesions for diagnosis by fish disease specialists.manage capture broodstock operationsmanage capture broodstock operationsPlan and conduct wild broodstock capture and quarantine wild broodstock if necessary. Monitor the collection of larvae or juveniles from environment. Control the use of appropriate techniques for the ...screen live fish deformitiesscreen live fish deformitiesExamine live fish, including larvae, to detect deformities related to body shape, jaw deformity, vertebral deformity and skeletal deformity. If not detected, these could lead to risks for fish, such a...write work-related reportswrite work-related reportsCompose work-related reports that support effective relationship management and a high standard of documentation and record keeping. Write and present results and conclusions in a clear and intelligib...control aquatic production environmentcontrol aquatic production environmentAssess the impact of biological conditions such as algae and fouling organisms by managing water intakes, catchments and oxygen use.assess feeding behaviour of larvaeassess feeding behaviour of larvaeMonitor feeding behaviour in order to decide on suitability of feed composition, weaning larvae from live prey to dry feed or pellets.use aquacultural heating equipmentuse aquacultural heating equipmentOperate water heating and pump equipment as appropriate such as electrical heaters, heat exchangers, heat pumps, and solar pumps.carry out hatchery production processescarry out hatchery production processesCollect naturally spawned fish eggs, eliminate egg adhesiveness, incubate eggs until hatching, hatch and maintain newly born larvae, monitor larvae status, carry out early feeding and rearing techniqu...monitor water qualitymonitor water qualityMeasure water quality: temperature, oxygen, salinity, pH, N2, NO2,NH4, CO2, turbidity, chlorophyll. Monitor microbiological water quality.maintain hatchery facilitiesmaintain hatchery facilitiesMake minor repairs to hatchery facilities as required.use oxygenation equipmentuse oxygenation equipmentOperate different water oxygenation systems according to requirements: surface aerators, paddle wheel aerators, column/cascade aerators, and pure oxygenation systems.maintain hatchery recordsmaintain hatchery recordsMaintain hatchery production records and inventory accurately, including the preparation of health documents for the transport of juveniles.feed broodstockfeed broodstockFeed broodstock according to nutritional needs. This will initially include live prey such as rotifers and artemia.treat fish diseasestreat fish diseasesIdentify the symptoms of fish diseases. Apply appropriate measures to treat or eliminate diagnosed conditions.monitor hatchery productionmonitor hatchery productionMonitor and maintain hatchery production, monitoring stocks and movements.ensure aquaculture personnel health and safetyensure aquaculture personnel health and safetyMake sure that health and safety procedures have been established and followed across all aquaculture facilities including cages. Ensure that personnel and general public are instructed and all work a...culture aquaculture hatchery stocksculture aquaculture hatchery stocksUse appropriate implements to collect shellfish spat. Sort wild shellfish spat. Collect naturally spawned fish eggs; eliminate egg adhesiveness and incubate eggs until hatched. Handle fish and shellfi...fish identification and classificationfish identification and classificationThe processes which allow the identification and classification of fish.carry out fish disease prevention measurescarry out fish disease prevention measuresCarry out disease prevention measures for fish, molluscs, and crustaceans for land-based and water-based aquaculture facilities.
Optional (15) — show
fishing industryfishing industryThe business model of the fishing industry, including recreational, subsistence and commercial fishing, and the harvesting, processing, and marketing sectors.work in outdoor conditionswork in outdoor conditionsCan cope with the different climate conditions such as heat, rain, cold or in strong wind.monitor larval growthmonitor larval growthMonitor the growth and health of the larvae.carry out feeding operationscarry out feeding operationsCarry out manual feeding. Calibrate and operate automatic and computerised feeding systems. Monitor animal feeding behaviour.manage staffmanage staffManage employees and subordinates, working in a team or individually, to maximise their performance and contribution. Schedule their work and activities, give instructions, motivate and direct the wor...supervise the work of staff on different shiftssupervise the work of staff on different shiftsOversee the activities of the employees working in shifts in order to ensure continuous operations.create training materialscreate training materialsDevelop and compile training items and resources according to didactical methods and training needs and using specific types of media.encourage teambuildingencourage teambuildingStimulate teambuilding activities. Coach employees in order to help them reach their goals.manage teamworkmanage teamworkPlan the working schedule of a group of people in order to meet all time and quality requirements. Supervise, support and instruct members of a team. Provide feedback to teams and individuals on work ...use communication devicesuse communication devicesOperate communication devices in order to interact with customers, colleagues, and others.operate hatchery recirculation systemoperate hatchery recirculation systemEfficiently operate a hatchery recirculation system for specified aquatic organisms.collect broodstockcollect broodstockSource broodstock from fisheries and held them in maturation tanks before collecting their seeds.seek innovation in current practicesseek innovation in current practicesSearch for improvements and present innovative solutions, creativity and alternative thinking to develop new technologies, methods or ideas for and answers to work-related problems.provide on-site training in aquaculture facilitiesprovide on-site training in aquaculture facilitiesProvide on-site training in aquaculture facilities, through instruction and demonstration of skills. Provide, implement and supervise a training development plan.work in shiftswork in shiftsWork in rotating shifts, where the goal is to keep a service or production line running around the clock and each day of the week.
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Frequently asked questions
What does an aquaculture rearing technician do?
Aquaculture rearing technicians operate in aquatic organisms' production. They are specialists in the rearing, weaning and production of juveniles.
What skills does an aquaculture rearing technician need?
An aquaculture rearing technician needs 34 essential skills, including aquaculture reproduction, fish biology, plankton production, biosecurity, monitor fish mortality rates.
Will AI replace aquaculture rearing technician jobs?
The AI disruption score for aquaculture rearing technician is 25/100 (low risk). Skills most exposed to automation: write work-related reports, maintain hatchery records, monitor water quality. Most resilient: work in outdoor conditions, work in shifts, handle larval weaning process.
AI Replacement Risk
25/ 100
Low Risk
Low riskHigh risk
Quick Facts
ISCO GroupMarket-oriented skilled forestry, fishery and hunting workers
Essential Skills34
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