NOPR Collection:

Toxicity of some metals on the fish Therapon jarbua (Forskal, 1775)

2016-12-19T06:33:35Z

Title: Toxicity of some metals on the fish Therapon jarbua (Forskal, 1775) Authors: Krishnakumari, L; Varshney, P K; Gajbhiye, S N; Govindan, K; Nair, Vijayalakshmi R Abstract: Hg, V and Pb were more toxic to T. jarbua than the other metals studied. Recorded 86 h LC₅₀ for Hg, V, Pb, As, Cu, Zn, Ni and Co was respectively at 0.06, 0.62, 1.23, 3.38, 4.5, 11.0, 19.4 and 52.5 mg.l^-1. The 90U+0025 survival for 96 h for the above metals in the respective order was 0.018, 0.71, 1.03, 2.2, 5.9, 6.8 and 25 mg.l^-1. Toxicity of these metals was discussed and compared with earlier reports. Page(s): 64-66

Mercury, cadmium and lead in different tissues of fishes and in zooplankton from the Andaman Sea

2016-12-19T06:30:50Z

Title: Mercury, cadmium and lead in different tissues of fishes and in zooplankton from the Andaman Sea Authors: Kureishy, Tariq W; Sanzglry, Sujata; George, M D; Braganca, Analia Abstract: Several fishes, representing different trophic levels, and some zooplankton samples were analysed for Hg, Cd and Pb. There is a wide variation in the concentrations of these elements. Hg is quite low in practically all the tissues. Cd and Pb show increased levels in some tissues. Of particular importance are the elevated Cd levels in liver of almost all fishes which show a positive correlation with the size of the fish. Page(s): 60-63

Oxygen consumption in tropical bivalves Perna viridis (Linn.) and Meretrix casta (Chem.) exposed to heavy metals

2016-12-19T06:29:33Z

Title: Oxygen consumption in tropical bivalves Perna viridis (Linn.) and Meretrix casta (Chem.) exposed to heavy metals Authors: Mathew, R; Menon, N R Abstract: Effect of Ag, Cu, Zn and Pb ions on the oxygen consumption of P. viridis and M. casta was studied. Sublethal concentrations of Ag, Cu and Zn functioned as respiratory depressants in both the species. Decrease in respiration in P. viridis occurred above 0.01 ppm with Ag and 0.05 ppm with Cu. Whereas in M. casta the rate of oxygen uptake reduced above 0.02 ppm in the case of Ag and Cu and 1 ppm in the case of Zn. However, Pb, at higher concentrations ( > 0.4 ppm) accelerated oxygen uptake, Depressive effects of oxygen consumption was manifested at concentrations much below the LC ₅₀/96 hr values. Page(s): 57-59

Tolerance of the worm Enchytraeus barkudensis (Stephenson 1915) in different sulphide concentrations

2016-12-19T06:26:55Z

Title: Tolerance of the worm Enchytraeus barkudensis (Stephenson 1915) in different sulphide concentrations Authors: Reddy, A Chandra Sekhar; Rao, T V; Pardhasaradhi, K Abstract: Tolerance of the worm in different sulphide concentrations (2 to 15 x 10^-6) was studied at constant salinity (16.5 x 10^-3) and anoxia survival of E. barkudensis decreased with the increase in sulphide concentrations. Page(s): 55-56