By the end of this chapter, you will be able to:
These skills will help you run a successful fish farming operation, ensuring healthy fish growth and a productive farm.
Compiled by: Beatrice Atieno
Fish farming is a vital agripreneurship venture in Kenya, offering significant opportunities for income generation and food security. Successful fish farming requires careful management of the aquatic environment and fish stock to optimize growth and production. This chapter addresses essential practices for conducting fish farming, focusing on species identification, water management, fish health, and marketing of hatchery products, all tailored for agripreneurs aiming to establish or improve their fish enterprises.
Identifying fish species is the first step in fish farming, because each species has its own needs for water, temperature, food and space, and its own market. A farmer who cannot tell a tilapia from a carp, or a milkfish from a mullet, cannot choose stock that suits the site or buy fingerlings with confidence. Species are told apart by looking at a few features of the live or freshly caught fish.
Marine fish live in the sea. Kenya has a coastline on the Indian Ocean, and farming of marine and brackish-water fish, called mariculture, is practised mainly in coastal ponds, pens and cages. Some marine fish are farmed from stocked seed, while many others, such as tunas and snappers, are caught wild and are identified for fishing and trade rather than for farming.
| Species | How to identify it | Farming notes |
|---|---|---|
| Milkfish (Chanos chanos) | Silvery, streamlined body, small mouth without teeth, deeply forked tail | Feeds on algae and plankton; tolerates a wide range of salinity; reared in brackish ponds |
| Grey mullet (Mugil cephalus) | Rounded, rather cylindrical body, blunt head, two separate dorsal fins, silvery sides with faint stripes | Grazes algae and detritus on the pond bottom; tolerates fresh, brackish and sea water |
| Rabbitfish (Siganus species) | Flat-sided body, small mouth, venomous spines in the fins | Plant eater that grazes algae; handle with care to avoid the spines |
| Grouper (Epinephelus species) | Heavy body, large mouth with strong jaws, mottled or spotted colouring | Meat eater; grows slowly and needs fish-based feed; fetches a high price |
Fresh water fish live and are farmed in rivers, lakes, dams and ponds with water of very low salt content. Most fish farming in Kenya's inland areas uses freshwater species reared in earthen ponds, tanks and cages.
| Species | How to identify it | Farming notes |
|---|---|---|
| Nile tilapia (Oreochromis niloticus) | Deep, flat-sided body with scales; one long dorsal fin with spines in front and soft rays behind; dark vertical bars on the tail fin | Feeds on plants, plankton and feed pellets; grows best in warm water of about 25 to 30 °C; the female carries the eggs in her mouth |
| African catfish (Clarias gariepinus) | Long, scaleless body, flat head, four pairs of barbels, long dorsal and anal fins | Eats a wide range of foods including fish; can gulp air, so it survives in water low in oxygen |
| Common carp (Cyprinus carpio) | Two pairs of barbels at the mouth, one long dorsal fin with a strong spine, large scales | Feeds on the pond bottom; tolerates cooler water than tilapia |
| Rainbow trout (Oncorhynchus mykiss) | Slim, speckled body with a pink to red stripe along the side and a small fat fin on the back | Needs cool, clean, well-oxygenated running water, so it is farmed in cooler highland areas; eats meat-based feed |
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Create a free accountThis chapter covers the essential aspects of conducting fish farming, beginning with the identification of fish species, distinguishing between marine and freshwater varieties. It then discusses the critical factors involved in selecting an appropriate fish farm site, including considerations of security, the species to be reared, soil type, water availability, market access, reliable fingerling sources, and the management skills required. The construction of fish ponds is examined as a foundation for successful fish farming. Maintenance and management practices are detailed extensively, highlighting aeration, control of water flow, water quality monitoring, predator control, sludge removal, and proper cleaning techniques. The chapter also addresses the control of fish pond waste and predators to maintain a healthy environment. Causes of fish diseases are explored, categorizing them into environmental, hereditary, microbial, nutritional, and physical injury factors. Finally, the chapter concludes with the principles of fish pond stocking, emphasizing the importance of proper stocking practices for optimal fish production.
Type: Individual
| Tools & Equipment | Materials |
|---|---|
| Magnifying glass | Live freshwater fish specimens (Tilapia, Catfish, Nile Perch) |
| Identification charts | Live marine fish specimens (Mackerel, Snapper, Sea bream) |
| Latex gloves | Aquarium tank (60cm x 40cm x 30cm) |
| Notebook | |
| Pen |
| S/N | Item | Quantity |
|---|---|---|
| 1 | Live freshwater fish specimens (Tilapia, Catfish, Nile Perch) | 3 specimens per Candidate |
| 2 | Live marine fish specimens (Mackerel, Snapper, Sea bream) | 3 specimens per Candidate |
| 3 | Aquarium tanks (60cm x 40cm x 30cm) | 1 Pc per Candidate |
| 4 | Identification charts for fish species | 1 Pc per Candidate |
| 5 | Magnifying glass | 1 Pc per Candidate |
| 6 | Latex gloves | 1 Pair per Candidate |
| 7 | Notebook | 1 Pc per Candidate |
| 8 | Pen | 1 Pc per Candidate |
| Items to be Evaluated | Marks Available | Marks Obtained | Comments |
|---|---|---|---|
| TASK 1: Identification and Classification of Fish Species | |||
| Wore appropriate PPE including latex gloves (Award 2 marks for PPE worn correctly or zero) | 2 | ||
| Handled fish specimens carefully without causing harm (Award 3 marks for careful handling or zero) | 3 | ||
| Used identification charts and magnifying glass correctly to observe key features (Award 1 mark for each correct usage x4 or zero) | 4 | ||
| Recorded physical characteristics accurately in the notebook (Award 3 marks for accurate and complete recording or zero) | 3 | ||
| Classified fish species correctly into freshwater and marine groups (Award 1 mark for each correct classification x5 or zero) | 5 | ||
| Identified fish species suitable for farming and justified choices (Award 3 marks for correct suitability identification or zero) | 3 | ||
| Cleaned working area and returned specimens to tanks properly (Award 2 marks for proper cleanup or zero) | 2 | ||
| Sub-Total | 22 | ||
| PRODUCT CHECKLIST | |||
| Correct identification of six fish species with physical features matching charts (Award 2 marks per correctly identified species x 5 or zero) | 10 | ||
| Sub-Total | 10 | ||
| GRAND TOTAL | 32 | ||
Type: Individual
| Tools & Equipment | Materials |
|---|---|
| Soil testing kit | Notepad (A4 size) |
| Measuring tape 50m | Pen |
| GPS device | Protective gloves |
| Water testing kit | |
| Camera or smartphone |
| S/N | Item | Quantity |
|---|---|---|
| 1 | Soil testing kit | 1 set per 5 Candidates |
| 2 | Measuring tape 50m | 1 Pc per Candidate |
| 3 | GPS device | 1 Pc per 5 Candidates |
| 4 | Notepad (A4 size) | 2 Pcs per Candidate |
| 5 | Pen | 1 Pc per Candidate |
| 6 | Protective gloves | 1 Pair per Candidate |
| 7 | Water testing kit | 1 set per 5 Candidates |
| 8 | Camera or smartphone for site photos | 1 Pc per Candidate |
| Items to be Evaluated | Marks Available | Marks Obtained | Comments |
|---|---|---|---|
| TASK 1: Fish Farm Site Inspection and Evaluation | |||
| Wore appropriate protective gloves and attire (Award 2 marks or zero) | 2 | ||
| Measured site dimensions accurately (50m x 30m) (Award 3 marks for correct measurement or zero) | 3 | ||
| Conducted soil type assessment using soil testing kit (Award 5 marks for correct soil texture and drainage evaluation or zero) | 5 | ||
| Tested water availability and quality at the site (Award 5 marks for correct water source identification and quality parameters or zero) | 5 | ||
| Assessed market accessibility including distance and transport means (Award 3 marks for accurate market access evaluation or zero) | 3 | ||
| Evaluated security measures and risks at the site (Award 2 marks for identifying security risks and possible mitigations or zero) | 2 | ||
| Recorded observations clearly and took photographic evidence (Award 3 marks for clear, organized notes and relevant photos or zero) | 3 | ||
| Sub-Total | 23 | ||
| PRODUCT CHECKLIST | |||
| Site suitability report detailing soil type, water availability, market access, and security with correct site measurements (50m x 30m) (Award 12 marks for a comprehensive, accurate, and well-presented report or zero) | 12 | ||
| Sub-Total | 12 | ||
| GRAND TOTAL | 35 | ||
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