The present investigation was carried out to study the zooplankton at the Mahasangavi Resrvoir, Taluka Patoda District Beed. Variation and the abundance of zooplankton during the study period from April 2013 to March 2014 were described. Higher population density of zooplankton in rainy season is observed and the results are discussed. The members of the zooplankton community are important for their major role in the tropics dynamics and in energy transfer in the aquatic ecosystem. They provide food for fishes in the freshwater bodies and play a major role in the fish production. The zooplankton samples were collected from April 2013 to March 2014 during early morning hours using a plankton net with mesh of 100 m. The zooplankton samples were preserved in 5% formalin. The different species of Rotifers, Cladocerans and Copepods were isolated and studied under compound microscope for their taxonomic identification.

A combination of probiotics and prebiotics as synbiotics allows assessing their synergistic effects. This study evaluated the effect of synbiotic (Lactobacillus acidophilus and fructooligosaccharides+mannan oligosaccharides, FMOS) on growth, hematological parameters, plasma hormonal, and genes expression in Oreochromis niloticus. A total of 600 O. niloticus of an average initial weight ranged from (4.96 to 5.96 g) was divided into four experimental groups for 84 days. Four basal diets Diet 1 (control), Diet 2, Diet 3 and Diet 4 were formulated to contain four levels of L. acidophilus (0.00, 0.42×107, 0.84×107 and 1.35×107CFU g-1) respectively, each level supplemented with 1% FMOS except of the control diet. O. niloticus fed diet supplemented with synbiotic showed significant (P<0.05) increases in growth and feed utilization. The highest final body weight, best feed conversion ratio, protein efficiency ratio and best chemical composition were obtained by the fish fed synbiotic Diet 3. Supplementation with synbiotic significantly increased in hematological parameters, growth hormone (GH) and insulin-like growth factor-I (IGF-I). The highest expression of GH and GHR1 were detected in liver of fish fed Diet 3. However, IGF-I was down regulated in liver of fish fed Diet 2 and Diet 4 whereas, IGF-I mRNA level in liver of fish fed Diet 3 up regulated and its expression was parallel with GH and GHR1 expression in liver of fish fed Diet 3. The expression of GH and GHR1 genes in spleen down regulated in all fish fed Diet 2, Diet 3 and Diet 4. On contrary, the expression level of IGF-I in spleen of fish received either Diet 3 or Diet 4 was slightly up regulated, but IGF-I mRNA level was down regulated in fish fed Diet 2 than other treatments. The expression level of GH, IGF-I and GHR1 genes were down regulated in intestine of fish fed synbiotic than other control diet.

Brown trout (Salmo trutta fario L.) were raised according to organic guidelines of the German association “Naturland”. Three certified organic trout feeds were tested. A control group was fed a commercial diet. Organically grown fish were larger at harvest than control fish and in better condition. The feed conversion ratio was higher for the control diet. Specimens were analysed comparing body composition including maturation, gross energy level, carcass and fillet yield. Lipid levels of 5.5% to 6.9% were found in the fillets, associated with a sum of eicosapentaenoic acid and docosahexaenoic acid between 1.3% and 1.7%. Free amino acids varied only slightly (3.6 - 4.7 g kg-1 fillet). Mean values for taurine and selenium were between 0.5 mg kg-1 and 1.4 mg kg-1 and 0.10 mg kg-1 to 0.19 mg kg‑1, respectively; lowest contents were found in Brown trout raised with conventional feed. Water-binding ability and texture showed no systematic differences. Sensory evaluation rated all fillets as highly acceptable. This study demonstrates that organic feedstuffs for Brown trout production do not decrease final product quality.