Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/153222
Title: EFFECT OF PROTEIN QUANTITY AND QUALITY ON GROWTH AND REPRODUCTION IN THE DWARF GOURAMI, COLISA LALIA (HAMILTON)
Authors: LOUIS LANDESMAN
Issue Date: 1989
Citation: LOUIS LANDESMAN (1989). EFFECT OF PROTEIN QUANTITY AND QUALITY ON GROWTH AND REPRODUCTION IN THE DWARF GOURAMI, COLISA LALIA (HAMILTON). ScholarBank@NUS Repository.
Abstract: Of all the major components of diet, protein is the most important and the most expensive. The purpose of this research was to study the effect of dietary protein quantity and quality on growth, carcass composition, ovary development and reproductive performance of female dwarf gouramis, Colisa lalia (Hamilton). When juvenile gouramis were fed fish meal based diets formulated to contain 5, 15, 25, 35 and 45% protein those fish fed the 35% protein diets grew best while those fed the 5% protein diet grew poorest. Adult females also grew best when fed 35% protein diets. When juveniles were fed casein and gelatin based diets supplemented with purified essential amino acids, those fish fed lysine deficient diets had the worst growth compared to juveniles fed diets deficient in arginine, methionine, leucine and isoleucine. When juveniles were fed increasing percentages of dietary protein increasing amounts of crude fat accumulated in their carcass. Those juveniles fed 35% dietary protein had the greatest crude fat percentage in their carcass. Similar results were found when adult females were fed the same diets. When juveniles were fed diets deficient in essential amino acids, fish fed lysine deficient diets had the lowest crude fat contents in their carcass while fish fed isoleucine deficient diets had the highest crude fat contents. When juveniles were fed 5, 15, 25, 35 and 45% protein diets, those fed the 35% protein diet had the highest mean ovary weight and GSI at the end of the experiment while those fed the 5% protein diet had the lowest. Similar results were observed when adult females were fed the same diets. When juveniles were fed amino acid deficient diets, females fed methionine deficient diets had ovaries with significantly lower weight than those fed the other diets. These fish also had the lowest GSI. When recrudescent adult females were fed diets containing 1.6, 2.6, 3. 6 and 4. 1% of their protein as methionine, those females fed 2.6% methionine diets had the highest mean ovary weight and GSI. When juvenile females fed 5, 15, 25, 35 and 45% protein diets were tested for spawning ability with males from the farm, increased dietary protein levels tended to produce females that spawned more eggs with more larvae hatching from these eggs. When adult females fed the same diets were tested for their reproductive performance, females fed the 35% protein diet had the greatest number of larvae produced and percent eggs hatching into larvae. When juveniles were fed amino acid deficient diets, and then tested for spawning ability, only one female fed the isoleucine deficient diet out of twelve tested spawned. Females fed methionine deficient diets, on the other hand, did not spawn at all. Females fed the control diet and diets deficient in the other essential amino acids tested did spawn. Females fed diets containing 1. 6% of protein as methionine failed to spawn while females fed diets containing 2. 6% or more of their protein as methionine did spawn successfully.
URI: https://scholarbank.nus.edu.sg/handle/10635/153222
Appears in Collections:Master's Theses (Restricted)

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