In the process of breeding shrimp, we can often encounter shrimp in a period of time feeding and eating materials appear different from usual situations, may be this situation every once in a while automatically return to "normal", but sometimes if you do not care about this abnormality, often lead to immeasurable consequences.
So, what are the general situations in which shrimp have feeding problems during farming?
Take Penaeus vannamei as an example, there are 5 common species!
[1] At first, the feeding intake was normal, but after a period of breeding, the amount of feeding decreased and the feed intake was less;
Reasons for reference:
1. The previous bait exceeds the capacity of the shrimp pond, resulting in too much leftover material at the original feeding point of the shrimp pond, and the long-term accumulation of the bottom of the shrimp pond has been spoiled, which is easy to produce harmful substances such as hydrogen sulfide and nitrite, resulting in shrimp no longer going to the feeding point to feed.
2, the water quality deterioration caused by the incidence of shrimp disease associated with the reduction of feeding, this situation of shrimp diseases are many derived from shrimp fry brought in, when the temperature gradually rises, in the pathogen suitable for the growth of the temperature, will cause the shrimp disease feeding less, such as the temperature rises to the temperature that can inhibit the development of germs, such as more than 28 degrees Celsius, the shrimp pond in this period will return to "normal".
However, after this process, the intake of shrimp will not rise significantly!
[2] Shrimp have no feeling for artificial feed after the shrimp is released, and there is a small amount of food intake after 10-20 days;
Reasons for reference:
1, shrimp fry survival rate is high when this situation occurs, most of them are better water quality cultivation before the shrimp pond is released, and the plankton in the pond can already meet the feeding needs of shrimp fry, coupled with its own love for natural food, there will be no feeling for artificial feed.
2, shrimp fry survival rate is low when this situation occurs, the general reason is that the shrimp fry in the transportation process before the release of stress reaction, the specific reason may be due to the transport environment temperature is too high, of course, after the release of the shrimp pond itself PH is too high, will also cause such a situation.
3, the purchased shrimp fry itself is weak + the water quality environment is not good enough.
[3] For a long time, if you are at a significantly small eating level, there will be leftovers in the feeding;
Reasons for reference:
1. The feed fed has poor palatability, insufficient nutrition, and less trace elements needed in the growth of shrimp in the molting shell, resulting in slow digestion of shrimp feed and anorexia.
2, the quality of the shrimp fry itself is poor, some shrimp fry may have been living in the "medicine pond" before the emergence of seedlings, the emergence period looks very healthy and strong, but after the seedlings are released into the shrimp pond and leave the "medicine pool", the shortcomings of the shrimp with weak disease resistance and poor ability to adapt to the environment will appear.
3, shrimp pond water temperature is low (the best water temperature for the growth of Penaeus vannamei in South America is about 25 ° C -32 ° C), shrimp do not have a good appetite, growth rate slows down, wait until the temperature rises, the daily opening of the aerator time increases, the pool PH value and ammonia oxygen content is reduced, the situation may change.
[4] The shrimp stocking density is not high, but the feeding is fast, and the amount of bait can be felt to be insufficient;
Reasons for reference:
1, the density of the shrimp released is not high, and the vitality is OK, but the consumption of eating materials is obviously unreasonable, generally stemming from the fact that the shrimp pond was not completely cleared earlier, and there are other wild trash fish and crabs in the pond and shrimp "grabbing food".
2. When the exogenous water source is filled with water, the water body has exotic wildlife, and the shrimp in the pool grab food.
[5] Sudden reduction in feeding intake, a large number of leftover materials, and returned to normal in a short period of time;
Reasons for reference:
1, in a short period of time there is continuous rainy weather, shrimp pond has a continuous lack of oxygen, in this case, oxygenation can only maintain the life of shrimp, but can not increase the appetite of shrimp, and so on after the rain will be better.
2, there is a large number of algal toxins in the water (naked algae, microcystis production), water quality is polluted, it will seriously affect the appetite of shrimp, algae corruption will produce hydrogen sulfide and other toxic substances, but also trigger the shrimp floating pond situation, then the pond owner will have to change the water in time.
3, the change of feed palatability, if there is a situation of changing the feed in the recent breeding process, then, this situation may be a short refusal of shrimp in the process of adapting to the new feed, it is recommended to replace the feed, do not cut a one-size-fits-all, it is recommended to increase a small amount, step by step, so that the shrimp have an adaptation stage.
The pictures in this article originated from the Internet, invaded and deleted ~