A closer look at feeding duration can help determine if fish are being fed properly. It's normal for fish to eat within 3 hours after feeding. If they finish their meal in about 2 hours, it may indicate that the amount of food provided is insufficient, and some fish might not have eaten enough. In such cases, you should consider increasing the feeding quantity. On the other hand, if the food remains uneaten for more than 4 hours and the fish have left the feeding area, it suggests that there is enough food available, and you may need to reduce the amount in the next feeding session.
Second, monitoring fish growth is essential. From April to May, fish typically begin to eat more as their growth rate increases. When planning feedings over a week or ten days, pay attention to changes at the start and end of each period. If the fish finish their food quickly by the weekend or the second day, it could mean that their weight has increased, and the current feeding amount may be too low. In this case, you should adjust the feed portion accordingly to meet their growing needs.
Third, observe the movement of the fish in the water. After eating, most fish tend to sink to the bottom. However, if they are active near the surface and frequently swim up and down, especially fry or fingerlings swimming in groups, it’s a sign of hunger. This behavior is often referred to as “race horse disease†and indicates that the fish are starving. You should feed them immediately to prevent mass deaths.
Lastly, check the water quality. For species like oysters and plankton-feeding fish, the clarity and richness of the water can indicate whether their nutritional needs are met. If the water is too clear or thin, consider using fertilization techniques to boost plankton growth. Conversely, if the water becomes too rich and the fish show signs of floating head (lack of oxygen), it’s time to change the water and increase aeration. In severe cases, you may need to use trichlorfon to control zooplankton populations and improve water conditions for better fish health.
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