Profession 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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Personality Type

  • Enterprising / Realistic
  • Realistic / Investigative

Knowledge

  • Biosecurity

    Be 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.

  • Plankton production

    The methods, characteristics and equipment used to cultivate phytoplankton, microalgae and live prey such as rotifers or Artemia with advanced techniques.

  • Fish biology

    The study of fish, shellfish or crustacean organisms, categorized into many specialised fields that cover their morphology, physiology, anatomy, behaviour, origins and distribution.

  • Aquaculture reproduction

    The 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, the use of hormones to induce reproduction and the broodstock recruitment by genetic selection.

  • Fish identification and classification

    The procedures and practices followed in the identification and classification of fish, aquatic plants and insects.

Skills

  • Handle larval weaning process in nursery stage

    Monitor hatchery production. Switch feed from live prey to dry feed. Pregrow cultured species and care for juveniles. Grade young cultured species.

  • Carry out fish disease prevention measures

    Carry out disease prevention measures for fish, molluscs, and crustaceans for land-based and water-based aquaculture facilities.

  • Screen live fish deformities

    Screen for deformities in live fish including larvae

  • Use oxygenation equipment

    Operate different water oxygenation systems according to requirements: surface aerators, paddle wheel aerators, column/cascade aerators, and pure oxygenation systems.

  • Use aquacultural heating equipment

    Operate water heating and pump equipment as appropriate such as electrical heaters, heat exchangers, heat pumps, and solar pumps.

  • Control fish diseases

    Identify the symptoms of fish diseases. Apply appropriate measures to treat or eliminate diagnosed conditions.

  • Maintain hatchery facilities

    Make minor repairs to hatchery facilities as required.

  • Monitor fish health status

    Monitor the health of fish, based on feeding and general behaviour. Interpret environmental parameters and analyse mortalities.

  • Carry out hatchery production processes

    Collect 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 techniques of the cultured species.

  • Use water disinfection equipment

    Operate water disinfection equipment, using mechanical filtration, biological filtration, UV disinfection and ozonation as needed.

  • Monitor hatchery production

    Monitor and maintain hatchery production, monitoring stocks and movements.

  • Cultivate plankton production

    Cultivate phytoplankton and microalgae. Cultivate live prey such as rotifers or Artemia with advanced techniques.

  • Ensure aquaculture personnel health and safety

    Make 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 activities are carried out according to relevant health and safety regulations.

  • Monitor water quality

    Measure water quality: temperature, oxygen, salinity, pH, N2, NO2,NH4, CO2, turbidity, chlorophyll. Monitor microbiological water quality.

  • Control aquatic production environment

    Assess the impact of biological conditions such as algae and fouling organisms by managing water intakes, catchments and oxygen use.

  • Monitor fish mortality rates

    Monitor fish mortalities and assess possible causes.

  • Induce spawning of cultured aquaculture species

    Induce spawning using appropriate techniques for specific cultured species of fish, molluscs, crustaceans or others. Determine sexual maturity of broodstock, using appropriate techniques as indicated for cultured species of fish, molluscs and crustaceans. Control broodstock sexual cycle. Use hormones to induce reproduction.

  • Condition broodstock

    Incubate 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.

  • Maintain hatchery records

    Carefully maintain hatchery production records and inventory. Maintain accurate hatchery records including the preparation of health documents for the transport of juveniles.

  • Manage capture broodstock operations

    Plan 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 specific species i.e. fish, molluscs, crustaceans or others.

  • Maintain hatchery equipment

    Make minor repairs to hatchery equipment as required.

  • Maintain the production of juveniles at the nursery stage

    Maintain the production of juveniles at the nursery stage using advanced high density production techniques

  • Preserve fish samples for diagnosis

    Collect and preserve larval, fish and mollusc samples or lesions for diagnosis by fish disease specialists.

  • Feed broodstock

    Feed broodstock according to nutritional needs. This will initially include live prey such as rotifers and artemia.

  • Culture aquaculture hatchery stocks

    Use 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 shellfish broodstock and feed according to their needs.

  • Ensure compliance with aquaculture standards

    Ensure that operations comply with standards for sustainable aquaculture.

  • Assess feeding behaviour of larvae

    Monitor feeding behaviour in order to decide on suitability of feed composition, weaning larvae from live prey to dry feed or pellets.

  • Write work-related reports

    Compose 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 intelligible way so they are comprehensible to a non-expert audience.

  • Maintain aquaculture water quality in hatcheries

    Measure 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.

Optional knowledge and skills

work in outdoor conditions create training materials operate hatchery recirculation system communicate in english in a competent way plan the work of teams and individuals work in inclement conditions supervise the work of staff on different shifts plan team building work in shifts carry out feeding operations manage staff use communication devices seek innovation in current practices provide on-site training in aquaculture facilities