Chapter 4: Maintain fish hatcheries

4.1 Personal protective gears

Personal protective gear is the clothing and equipment a hatchery worker wears to stay safe while working with water, fish, chemicals and machines. A hatchery is a wet, busy workplace: floors are slippery, tanks hold several hundred litres of water, hydrated lime irritates the skin and eyes, and some fish, such as catfish, have sharp pectoral spines that can cut a hand. Protective gear also protects the fish. Soiled boots, bare hands and street clothes carry disease organisms into the tanks, so gear that is clean and used correctly keeps both the worker and the stock healthy.

Gear is the last line of defence. A well-run hatchery first removes hazards where it can, for example by fitting non-slip flooring and storing chemicals in labelled containers, and then gives each worker the gear needed for the hazards that remain.

Types of protective gear

The table lists the gear a worker in a tilapia or African catfish hatchery normally needs.

Gumboots

Gumboots are the main protection for the feet. A non-slip sole matters because algae and fish slime make a hatchery floor very slippery. Each work area should have its own pair, kept at the door, so that boots worn in the grow-out section never enter the hatching room. A footbath of disinfectant at the entrance cleans the soles before a worker steps inside.

Waterproof apron and clothing

A waterproof apron keeps the worker's own clothes dry and clean. Overalls or a clean work shirt are worn underneath and are changed once they are wet or soiled. Aprons are rinsed after each shift and hung to dry, because a damp apron that is thrown in a corner grows bacteria.

Gloves

Different jobs need different gloves:

• Long-cuff rubber gloves: used for scrubbing tanks, handling disinfectant and handling lime.
• Nitrile gloves: used when handling brood stock, eggs or samples, because they are thin enough to feel the fish and protect against infection.
• Heavy-duty gloves: used when handling large catfish with sharp spines, and when carrying rough items such as concrete blocks or pipes.

Pair of yellow work gloves used in carpentry (Source: Wikimedia Commons)

Disposable gloves are single use: they are thrown away after the job and never washed for reuse. Reusable rubber gloves are rinsed inside and out, disinfected and hung to dry after each use.

Eye, face and breathing protection

Hydrated lime and some disinfectants burn the eyes and the lining of the nose. Goggles and a dust mask are worn whenever a worker spreads lime on a tank floor, mixes powder into water or sprays disinfectant. If lime or a chemical splashes into an eye, the worker rinses it with clean running water for several minutes and reports to the hatchery manager before going back to work.

Clear protective eyewear for safety (Source: Wikimedia Commons)

Putting on, removing and caring for gear

1. Wash and dry the hands, then collect the gear needed for the day's tasks from the clean store.
2. Put on the apron over a clean work shirt and tie it firmly.
3. Pull on the gumboots and tuck the trouser legs inside them so that water cannot run down the legs.
4. Put on goggles and a mask before opening any chemical container.
5. Put on gloves last and pull the cuffs over the sleeves, or fold the sleeve cuff over the glove.
6. When the job is done, take off gloves first by turning them inside out, then goggles, apron and mask.
7. Wash the hands with soap and clean water.
8. Rinse the gear, disinfect it where required and hang it to dry in a place that is out of the sun, away from the fish tanks.
9. Check the gear for cracks, holes and worn soles before the next use and replace anything damaged.

Choosing gear for each task

Matching the gear to the task prevents both accidents and waste.

• Cleaning and scrubbing tanks: gumboots, apron, long-cuff gloves and goggles.
• Handling lime or disinfectants: all of the above, plus a dust mask.
• Netting and sorting brood stock: gumboots, apron and heavy-duty or nitrile gloves.
• Collecting eggs or counting fry: clean apron, nitrile gloves and a head cover.
• Working from a boat, raft or deep pond: a life jacket, with gumboots removed if they would fill with water.
• Working near pumps and aerators: gumboots, snug clothing without loose ends, and dry hands before touching any electrical switch.

Chapter Summary

Maintaining fish hatcheries requires the consistent use of personal protective gears to ensure safety and prevent contamination during hatchery operations. Proper management tools and equipment are essential for efficient hatchery functioning, enabling tasks such as water quality monitoring and feeding to be carried out effectively. Pre-stocking activities prepare the hatchery environment to support healthy fish development, including cleaning and conditioning of tanks. Sourcing brood stock involves a structured recruitment process that starts with advertising vacant positions to attract qualified personnel. Shortlisting candidates narrows down applicants based on relevant skills and experience, followed by interviews to assess suitability for hatchery roles. Recruitment formalizes the selection of staff, who then undergo training to acquire the necessary knowledge and skills for hatchery management. Finally, motivation strategies are critical to maintain staff commitment and productivity, ensuring the hatchery operates smoothly and meets production goals.