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Abstract:The growth and survival of Litopenaeus vannamei post larvae was measured in controlled different salinities condition 35ppt (T1), 40ppt (T2), 45ppt (T3) and 50ppt (T4) were maintained. Group of Shrimp post larvae (weight 0.032 g ± 0.002) were stocked at a density of 35 nos. /aquarium in above salinity ranges. Animals were fed with commercial feed (35% Crude Protein) @ 5% of body weight four times a day. The results indicate that higher SGR was observed in T2 (1.99±0.08) followed by T1 (1.75±0.07), T3 (1.54±0.06) and T4 (1.49±0.17). Highest survival (100 %) was recorded in T1 followed by T2 (96.42%), T3 (94.99%) and T4 (74.21%). From the results of the present study it could be seen that higher salinity significantly reduced the growth and survival of L. vannamei but will also open study area of physiological adaption of animal at higher saline water in performance of organisms.

The objective of the study was to find out the effect of partial replacement of fish meal in the diet of Labeo rohita juveniles. In this experiment, the data pertaining to growth, survival rate, feed conversion ratio, protein efficiency ratio of L. rohita at partial replacement of fishmeal with E. crassipes were evaluated. For that purpose fry of approximately equal weight (57.97mg ± 1.25) were distributed in groups of 15 to each four aquaria at 0% (T1), 10% (T2), 20% (T3), 30% (T4) and 40% (T5) inclusion levels of aquatic macrophyte, Eichhornia crassipes. Maximum mean weight gain (235.25 ± 11.04 mg) was observed in T1 and minimum (165.06 ± 10.93 mg) was observed in T5 at the end of the experiment. Among the treatments tested, the highest survival (89.99% ± 1.93) was recorded in treatment T1 and minimum was found in T4 (79.99% ± 2.72). Lowest FCR was recorded in treatment T3 (2.02 ± 0.39) and highest was found in T5 (3.08 ± 0.59). Higher SGR was observed in treatment T1 (297.15 ± 18.78%) and minimum was observed in T5 (182.74 ± 18.45%). The study revealed a decrease in the growth performance indices as the percentage of water hyacinth increases. In present study also there was not much difference in growth rate upto 20% incorporation of E. crassipes in the diet. Also, significant difference was observed among treatments with respect to feed utilization (P<0.05).

A shrimp Pacific White shrimp, Litopenaeus vannamei growth performance study during summer (S) and monsoon (M) was taken up for 120 days. The stocking density was 30, 40, 50, 60, 70 and 80pc/m 2 in six different treatments with three replicate. Experiment was conducted in 18 commercial culture pond having 0.5 ha size. The initial average body weight of shrimp post larvae during summer and monsoon crop at stocking was 0.06±0.01g and 0.06±0.04g, respectively. The data revealed significant (p<0.05) difference in mean growth during summer and monsoon crop at different stocking densities with individual final weights of 26.08±0.05 followed by 23.

Mud crabs, or mangrove crabs, are one of the most valuable groups of crab species in the world. Several studies have been conducted to describe the nutrient requirements of mud crabs. Only preliminary studies have been conducted to define the nutritional ingredients requirements for growing out diets. Results of the analysis revealed the major components of seaweeds (Ulva reticulate and Sargassum cinctum) poultry waste, earth worms and fish meal with carbohydrate 57.18 % (Ulva reticulate) and 55.86 % (Sargassum cinctum), 31.07 %, 21.83 % and 2.89 %, followed by ash content of 21.3 % (U. reticulate) and 14.1 % (S. cinctum), 8.4 %, 12.0 % and 8.40 %, respectively. The crude protein component of fishmeal, soyabean meal, earthworms and seaweeds were obtained in little amount with 61.20 %, 48.3%, 36.2 % and 13.41 % (U. reticulate) and 10.67% (S. cinctum) and followed by crude lipid component of poultry waste 25.0%, seaweeds 13.41 % (U. reticulate) and 10.67 % (S. cinctum), earthworms 9.52% and fishmeal 9.20%  respectively. These results of nutritional composition indicated that poultry waste, earthworms and seaweeds have potential as a source of feed supplement and human nutrition.