Few Tips to Protect the Health of Hepatopancreas for Litopenaeus Vannamei

As we all know , there are relates many elements for shrimp feeding , besides water quality , the health of hepatopancreas is also vital for L. Vannamei . Hepatopancreas works as one transfer station or transportation junction , it’s health condition can be reflected during the whole body .The following are few tips about protecting hepatopancreas health.

The main functions of hepatopancreas for L.Vannamei:

1 Digest function

There are words that prawn only can keep the health of intestine with health hepatopancreas, shrimp will become more and more weak after fed with antibiotic when white feces disease happens .  Hepatopancrea is one important digest organ , which can secret kinds

Of digestive enzymes ,then the nutrients will be absorbed in intestine . The digestive function will directly affected when there are lesion of liver, intestine will become diminution at the beginning ,then hepatopancrea will shrivel and turn into pale , white feces happens and intestine become red . Through Prawn with white feces eat feed also, the nutrients are hard to digested or absorbed and become thin remarkably because of the disease of hepatopancreas .
2 Detox function

Prawn hepatopancreas also have detox functions , the secrets in liver can help to decompose the hazards . If the deposited toxins fail to decompose on time when hepatopancreas damaged ,the hazardous substance will  affect  intestine easily , especially when there are damage of intestinal villus and lose part of the shield functions  .  

So , it’s important to remember avoid feeder too much at one time , which only bring heavy burden for hepatopancreas and affect the functions of digestion and detox . One batch feeding shall be eat out within 1 hour . what’s more , prawn is easily produce stress action when there are changes of water quality or  pool environment , and prawn is very weak during exuvial period , at this time we shall reduce the feeder in order to release the burden of hepatopancreas.

There are three important development period of hepatopancreas : homogeneous period (2-4 cm length ) --turn liver period ( 25 days )---envelop period ( 6-7 cm length), we shall pay more attention for hepatopancreas helath ,which will relates to the growth performance  and body health for prawn directly .

The three period of development of hepatopancreas:

A  Homogeneous period
Homogeneous period also be known as start feeding period, shrimp seed is about 2-4 cm length with freak hepatopancreas function.Metabolism topic is the main problems during this period while bacterial inflections rarely happens .so relieve the pressure of  metabolism and digestion is the most important in order to promote growth and development, improve immunity by activating CIS, rich nutrition system and promote digestion.

B. Turn liver period
 Turn liver period start with 25 days after shrimp fed in pools, which means one special growth time with the characteristics : high develop speed of shrimp length and weight , but weak organic development ,especially for hepatopancreas. This is the vital period for hepatopancreas health, liver diseases are easily occur such as swelling and atrophy of hepatopancreas , with the reasons as follows:  feed intake is increased to guarantee the quick development , large toxins are accumulated which bring heavy burden to hepatopancreas , improper nursing and huge change of environment can also aggravate the disease, so  human control is necessary during this period, and it’s important to protect the health of hepatopancreas and detoxing .

As one natural green feed additives , lots experiments prove that adding bile acids in shrimp feed at this period can effectively improve immunity , relieve the pressure and repair the damage of hepatopancreas by promote the secretion of bile and accelerate the detoxing of deposited toxins .what’s more , bile salts can also improve the anti-stress ability .

C. Envelop  period
Envelop period is the mature time of hepatopancreas function , shrimp length 6-8 cm. At this period , there are one white protective envelop besides and turn into normal dark chocolate brown color .

From now  , shrimp enter into one rapid development period , and also located in the middle during all the farming time, so it’s the first important to prevent hepatopancreas disease.

3 Have you notice the misunderstanding for hepatopancreas protection ?

 

A Antibiotic can’t solve all the questions, too much Vitamin is not good ,which also  bring heavy burden for liver . The amount of vitamins shall conform to the digestive ability of intestine and the scientific proportion .

B Not all herb extracts will do good for hepatopancreas, large amount also do damage of it’s health, like golden cypress . So it’s necessary to use high quality products .
C Antibiotics not only treat disease , but also produce endotoxins ,which will do harm for the health of hepatopancreas and intestine .

D Feed intake shall be reduced within reasonable dosage , stop feeding will cause the consume of glycogen and fat in liver . After a long time , there are usually result in hepatopancreas and digestive system shrink , and other disease .  Reasonable reduce the feed intake is feasible , but stop feeding is inadvisable .  

 

4 Few tips to protect hepatopancreas :

A  keep the quality of water ;

B purchase high quality feed , with scientific formulation and nutrition;

C Reduced the dosage of disinfector or pesticide which have great damage for liver and other organs,avoid changing the whole water frequently.

D if there are already heavy symptom ,like fatty liver , hepatomegaly or hepatotoxicity ,avoid using any antibiotics while some products with the functions detoxing , promoting liver spell recover and hepatopancreas protecting can be added .

E Appropriately reduce feed intake when there are hepatopancreas problems happens , which can be reduced to one third or one half of the normal amount.

F It always needs a long time to recover for hepatopancreas damage , patience is necessary. So ,for hepatopancreas health of L.Vannamei , preventing is much more important than treating .