Feed Nutrition and Feeding SS2 Livestock Farming Lesson Note

Why Do Fish Need to Eat?

Just like you and I need food to grow, play, and stay healthy, fish need balanced nutrition. In a pond, fish can’t just go to a market—they depend on what the farmer gives them.

A good fish diet must have:

• Proteins: For building muscles and fast growth (the most important part!).
• Carbohydrates & Fats: For energy to swim and stay active.
• Vitamins & Minerals: To prevent diseases and keep their bones strong.

If you don’t feed your fish well, they will be stunted (stay small), get sick easily, or even start eating each other!

Types of Fish Feed

There are two main ways fish get their food:

1. Natural Feed

These are tiny organisms that grow naturally in the water.

• Phytoplankton: Tiny green plants (this is why we fertilize ponds to make them green).
• Zooplankton: Tiny water animals that eat the plants.
• Worms and Insects: Found at the bottom of earthen ponds.

2. Artificial (Supplementary) Feed

This is the food the farmer brings to the pond.

• Local Materials: Things like rice bran, maize offal, or palm kernel cake.
• Pellets: These are “processed” balanced diets shaped into small balls.
  1. Floating Pellets: These stay on top of the water. They are great because you can see the fish eating.
  2. Sinking Pellets: These drop to the bottom. They are cheaper but harder to monitor.

Feed Formulation (Making the “Recipe”)

“Formulation” is just a big word for mixing different ingredients to make a perfect meal. A farmer wants the best growth for the lowest price.

Common Ingredients Used in Nigeria:

1. Fish Meal: Made from dried, ground fish. It’s the best source of protein but very expensive.
2. Soybean Meal: A good plant-based protein.
3. Groundnut Cake (GNC): Also provides protein and fats.
4. Maize/Corn: Provides energy (Carbohydrates).
5. Vitamin Premix: A “medicine-like” powder added to ensure the fish don’t get deficiency diseases.

The “Square” Method: Farmers often use a simple math tool called the Pearson Square to calculate exactly how much maize and how much fish meal to mix to get, say, a 35% Protein diet.

How to Feed Your Fish (Methods)

How you give the food is just as important as what is in the food!

1. Broadcast Feeding (Hand Feeding): The farmer stands by the pond and throws the feed across the surface.
   1. Pro: You can see which fish are not eating (maybe they are sick).
   2. Con: It takes time and effort.
2. Spot Feeding: You always throw the food in the same spot. The fish learn to gather there like a “dining room.”
3. Automatic Feeders: Machines that drop food at set times.
4. Demand Feeders: A container with a trigger. When the fish are hungry, they touch the trigger and food falls out.

The Golden Rules of Feeding

To be a successful fish farmer, follow these three tips:

• Don’t Overfeed: This is the biggest mistake! If fish don’t eat the food, it rots at the bottom, ruins the water quality, and kills the fish. “A hungry fish is a healthy fish; a stuffed pond is a dead pond.”
• The 5-Minute Rule: If the fish haven’t finished the food in 5 minutes, you have given them too much.
• Timing is Everything: Feed them when they are most active—usually early morning (8:00 AM) and late evening (5:00 PM). Avoid feeding during the hottest part of the day when oxygen in the water might be low.

Class Discussion / Homework

1. If you noticed your fish are always staying at the bottom and not coming up to eat, what could be wrong?
2. Why is “Fish Meal” usually the most expensive part of a feed recipe?
3. Between floating and sinking pellets, which one would you recommend for a beginner farmer? Why?

Farmer’s Secret: > The cost of feed usually takes up about 60-70% of all the money spent on a fish farm. If you can learn to make your own quality feed locally, you will make a lot more profit!