Compiled by: Joyce Waweru
Fish farming in Kenya increasingly relies on producing high-quality live feeds to support the growth and survival of fish, especially during their early stages. Live feeds provide essential nutrients and stimulate natural feeding behaviours, which improves fish health and farm productivity. This chapter focuses on the production of live fish feeds, covering the types, necessary tools, and methods for cultivating essential live feeds such as phytoplankton, zooplankton, and Artemia. Understanding these processes is crucial for fish farmers aiming to optimize feed availability and enhance fish growth in diverse farming systems.
Live fish feeds are vital for raising healthy fish fry and fingerlings in aquaculture. They offer superior nutritional value compared to artificial feeds, particularly in protein content and palatability, which supports early growth stages. In Kenya, where small-scale fish farming predominates, producing live feeds on-site is often more cost-effective and sustainable than purchasing commercial feeds. This section explores the types of live fish feeds and the equipment required for their production.
Live fish feeds vary in species and nutritional content, each suited to different fish developmental stages. Kenyan fish farmers commonly use phytoplankton, zooplankton, and Artemia as live feeds due to their availability and nutritional profiles.
Phytoplankton are microscopic photosynthetic organisms forming the base of aquatic food chains. They are rich in essential fatty acids, vitamins, and proteins necessary for larval fish development. Species such as Chlorella and Spirulina are frequently cultured in Kenya for use in tilapia and catfish hatcheries.
Zooplankton are small aquatic animals that feed on phytoplankton and organic detritus. They provide high protein content and stimulate natural feeding instincts in fish fry. Common zooplankton used include rotifers and cladocerans, which are easy to culture in ponds or tanks.
Artemia nauplii are widely regarded as premium live feed for fish larvae due to their balanced nutrients and digestibility. They hatch from cysts and are particularly beneficial in hatcheries for species like trout and tilapia. Artemia can be sourced commercially or hatched on-farm.
These freshwater cladocerans serve as excellent natural live feeds, rich in protein and fatty acids. They thrive in pond environments and can be cultured alongside fish farming operations in Kenya, offering an accessible feed source for smallholder farmers.
Tubifex worms are used in some aquaculture systems as live feed for carnivorous fish fry. They require specific culture conditions and are less common but provide high protein content beneficial for fast-growing species.
Producing live feeds requires specialized tools and equipment to ensure optimal culture conditions and harvesting efficiency. Proper equipment supports high yields and prevents contamination, which is critical for fish health.
| Name | Specification | Use |
|---|---|---|
| Culture tanks | Plastic or fiberglass tanks 200-1000 L | Used to culture phytoplankton and zooplankton under controlled conditions |
| Aerators | Electric or solar-powered diffusers | Provide oxygenation to maintain aerobic conditions in culture media |
| Microscopes | Compound microscope with 40x-100x magnification | For monitoring live feed cultures, identifying species and checking health |
| Artemia hatchers | Transparent plastic or glass containers with aeration | Used for hatching Artemia cysts under controlled salinity and temperature |
| Sieve nets | Fine mesh nets (20-100 µm) | For harvesting and separating live feeds from culture water |
Create a free account to open more of this chapter.
Free: practical guides, quick cards, workplace scenarios and more.
Create a free accountThis chapter provides a comprehensive overview of producing live fish feeds essential for successful fish farming operations. It begins by identifying the main types of live feeds including phytoplankton, zooplankton, Artemia, and Daphnia, each playing a vital role in the nutrition of different fish species. The chapter then discusses the necessary tools and equipment required for efficient live feed production, emphasizing their function in maintaining optimal culture conditions. Detailed methods for culturing phytoplankton and zooplankton are explained alongside the specific process of hatching Artemia cysts. Quality assessment techniques are also covered to ensure the live feeds meet nutritional and health standards crucial for fish growth. Proper storage practices are described to preserve feed viability and prevent contamination. Finally, the importance of maintaining accurate production records is highlighted to monitor feed production, manage resources, and support sustainable fish farming practices.
Which of the following is a type of phytoplankton commonly used as live fish feed? (2 marks)
a) Artemia
b) Chlorella
c) Daphnia
d) Copepods
Explain the role of zooplankton in the diet of juvenile fish. (3 marks)