NISCAIR Online Periodicals Repository Collection: IJMS Vol.40(3) [June 2011]

Discrimination of Nemipterus japonicus (Bloch, 1791) stock from Maharashtra and Goa states of India

Sun, 29 May 2011 22:58:59 GMT

Title: Discrimination of Nemipterus japonicus (Bloch, 1791) stock from Maharashtra and Goa states of India

Authors: Pawar, H.B.; Shirdhankar, M.M.; Barve, S.K.; Patange, S.B.

Abstract: Nemipterus japonicus specimens collected from Mumbai, Ratnagiri and Panaji showed positive and high degree of correlation (P<0.01) in between various morphometrics. Pooled regression equation for Mumbai, Ratnagiri and Panaji established between fork length and total length was FL = 0.2404 + 0.8912 TL, while estimated equation of standard length on total length was SL = 0.1866 + 0.7736 TL. Established regression equations for head length on total length and head length on standard length were HL = - 0.1102 + 0.2465 TL and HL = - 0.1641 + 0.3181 SL respectively. Weight on total length relationships for Mumbai, Ratnagiri and Panaji specimens did not differ significantly, therefore, data was pooled and estimated regression equation was W = 0.0141 TL ^3.0103, wherein isometric growth was observed. There were no significant differences observed between the relationships established among the morphometric characters as well as among length-weight relationships of N. japonicus collected from Mumbai, Ratnagiri and Panaji. The above envisages that fish which landed at all the three localities belonged to a single stock.

Page(s): 471-475

Sunflower oil cake as a replacement for fish meal in feeds of Tiger Shrimp, Penaeus monodon reared in tanks and in net cages

Sun, 29 May 2011 22:58:59 GMT

Title: Sunflower oil cake as a replacement for fish meal in feeds of Tiger Shrimp, Penaeus monodon reared in tanks and in net cages

Authors: Dayal, J. Syama; Rajaram, V.; Ambasankar, K.; Ali, S. Ahamad

Abstract: Replacement of fish meal in marine shrimp feeds is assuming greater importance due to increasing economic and ecological considerations. This study evaluated sunflower cake as a replacement for fish meal in tiger shrimp Penaeus monodon juveniles reared both in tanks and in net cages at 26-33 ppt salinity. Five practical diets were prepared by incorporating sunflower cake at 0, 2.5, 5, 7.5 and 10% level by replacing fish meal. The essential amino acid index (EAAI) of test diets ranged from 0.91 to 0.88. Growth and digestibility study was conducted for 45 d in 500 L experimental tanks shrimp weighing 0.51±0.02 g with three replications for each treatment. There were significant (P<0.05) reductions in daily growth coefficients and protein utilization efficiency in shrimp fed with diets having above 2.5% sunflower cake in experimental tanks. The lysine and methionine digestibility (92.4±0.11 and 93.4±0.01%, respectively) was significantly (P<0.05) higher at 2.5% level inclusion than at 10% level (81.67±0.12 and 83.36±0.17%, respectively). The free amino acid profiles of shrimp muscle at 4 h post feeding indicated significantly (P<0.05) lower levels for isoleucine, leucine, lysine and valine in shrimp fed with higher level of sunflower cake. The decreased levels of these essential amino acids could have hampered protein synthesis and in turn growth. With three dietary treatments (0, 5 and 10% sunflower cake diets) a 10-week growth trial was also conducted in net cages with tiger shrimp juveniles weighing 0.2 g. Significantly (P<0.05) lower daily growth coefficients (%/d) were observed in shrimp fed with 10% sunflower cake diet (1.642±0.017) compared to control (1.774±0.024). The results indicate that sunflower cake can be incorporated up to 5% by replacing 20% of fish meal in marine shrimp P. monodon practical feeds without compromising growth.

Page(s): 460-470

Brachionid rotifer diversity in Andaman waters

Sun, 29 May 2011 22:58:59 GMT

Title: Brachionid rotifer diversity in Andaman waters

Authors: George, Grinson; R., Sreeraj C.; S, Dam Roy

Abstract: Andaman rotifers are least studied and authenticated records are not available for sufficing the data on their biodiversity. Rotifers were collected from brackish water to see their species diversity. Rotifers identified during this study are Brachionus plicatilis, B. rotundiformis, B.murrayi, B.urceolaris, B. calyciflorus, B. falcatus and Kellicotia sp. This is a primary record on Brachionids of saline waters of Andaman. The detailed description of the rotifers recorded during the study in the coastal waters of S. Andaman is presented for substantiating the taxonomic relevance of the study.

Page(s): 454-459

Antimicrobial activities of the lichen Roccella belangeriana (Awasthi) from mangroves of Gulf of Mannar

Sun, 29 May 2011 22:58:59 GMT

Title: Antimicrobial activities of the lichen Roccella belangeriana (Awasthi) from mangroves of Gulf of Mannar

Authors: Devi, G Karthikai; Anantharaman, P; Kathiresan, K; Balasubramanian, T

Abstract: The present study, attempted to test antimicrobial activity of the mangrove lichen Roccella belangeriana collected from the Gulf of Mannar Biosphere Reserve area. The lichen was extracted in different solvents: acetone, methanol, diethylether, ethanol, ethyl acetate, petroleum ether, chloroform and water and tested against 14 bacterial strains and 3 fungal strains by well diffusion assay. Regarding antibacterial activity the maximum zone of inhibition was recorded in methanol extracts against Vibrio cholerae and the minimum zone of inhibition was in ethyl acetate extract against Klebsiella pneumoniae, Enterococci sp., Salmonella sp. and Shewanella sp. Regarding the antifungal activity, the maximum zone of inhibition was recorded against Aspergillus niger, and the minimum was noted against Rhizophus sp.

Page(s): 449-453