The Journal of Zoology Studies

04-13

Authors: Girish Kumar B, Bijoy Nandan S

The sub-lethal effects of copper on the humoral, enzymological and histopathological parameters in the teleost fish, Anabas testudineus and the curative capacity of vitamin C were investigated. The 96 hour LC50 value of copper was determined using Probit method and was found to be 1.74 mg/L. Fish blood from two sub-lethal concentrations, vitamin supplemented media and toxicant and vitamin free control were analysed on 7th, 14th, 21st and 28th day of exposure. The haemoglobin (Hb), haematocrit (Hct), erythrocyte count (RBC) and oxygen carrying capacity were reduced compared to the control values up to the day 21 followed by a significant increase (p < 0. 0001) in all test concentrations on the day 28. The microscopic observation of RBCs in higher concentrations and long exposure showed crenation, immature RBCs with enlarged nuclei, hypochromia and cytoplasmic vacuolation. The plasma lactate dehydrogenase (LDH) activity increased (p<0.0001) progressively up to 21st day of exposure and then decreased significantly towards the control value on the 28th day. Copper exposure caused a dose and duration based increase in hepatotoxic biomarkers like glutamate oxalo transaminase (GOT) and glutamate pyruvate transaminase (GPT) in all the samples studied. The liver of exposed fish showed drastic architectural disruption such as hepatocyte degeneration, cell necrosis, inflammation with sinusoid dilation and thrombus formation. The present investigation clearly reveals toxicity of copper even at sub-lethal concentrations on the physiology and histology of the fish. The betterment of humoral, enzymological and histological aspects in vitamin treated fish illustrates the curative and prophylactic role of the vitamin against copper intoxication

19-22

Authors: Md. Muzammel Hossain and Mohammad Abdul Baki

The present studies the molluscan fauna from twelve sampling stations within two sites of River Brahmaputra in Mymensingh, Bangladesh. Survey was carried out from December 2011 to November 2012. During survey period we have collected mollusca by hand packing from the study area and identified a total of 15 species. Altogether 15 species (10 gastropod and 5 bivalve species) were recorded during the study period. Among gastropoda Melanoides tuberculata (Muller), Indoplanorbis exustus(Deshayes)and Bellamya begalensis were most dominant species recorded from all stations and in Bivalve specie Lamellidens marginalis were found at ten stations out of twelve. Three types of habitat (Muddy, Sandy and low vegetation) also observed in the River. The study revealed that the molluscan community could be explored for possible use as biomonitors in the River Brahmaputra.

31-37

Authors: Naheed Jan, Qaisar Khan, Sumayya Raziq, Ahsan Khan*, Ali Muhammad Yousafzai

Physiochemical parameters of River Sardaryab (a tributary of River Kabul) were analyzed in Khyber Pakhtunkhwa (KPK) province of Pakistan. The water quality was studied during the months of March to July 2011. Aim of the study was to observe the suitability of River water for fish fauna. Possible sources of contamination were analyzed. The major contaminant found in the River Sardaryab signifying the release of domestic waste water into the River without any treatment. Parameters measured included Water Temperature, pH, Alkalinity, Total hardness, Total Chloride level, Nitrite and Nitrates. All the parameters were within the permissible limit with mean values and standard error include Air Temperature = 330±5.790C; Water Temperature = 30.120± 5.870C; pH = 8.22±1.26; Chloride = 0±0mg/l; Nitrite = 0.32±0mg/l; Nitrate = 7.1±2.56mg/l; Hardness = 150±37.14mg/l; Alkalinity = 232±26.41 mg/l. The water chemistry of the River reflects the absence of sub lethal pollution rendering the River water fit for fish and other aquatic organisms, livestock and irrigation.