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P. K. Das , V. Chakravarti , A. Dutta , S. Maity

Abstract

Four different tree species such as Ceriops tagal, Heritiera fomes, Nipa fruticans and Rhizophora apiculata commonly grown in mangrove swamps of Sundarbans, West Bengal, were studied for the leaf anatomy, stomatal characters and chlorophyll content. They displayed very distinct anatomical and stomatal modifications. The semi-mangrove, Nipa stood distinctly different from others. Of the halophytes, Heritiera showed deeply sunken stomata, covered by trichomes. It had more chlorophyll content and higher chlorophyll alb value, but had relatively small palisade-spongy ratio. The physiological significance of these modifications was discussed in relation to their specific adaptation to mangrove vegetation.

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A. Dutta , Anjali Roy , S. Mitra

Abstract

no abstract

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A. Dutta ¹, P. N. Sen ¹, T. Banerjee ¹

Affiliations
1 National Medical College, Calcutta, IN

Abstract

No Abstract.

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A. Dutta ¹, R. K. Ghosh ¹

Affiliations
1 Botanical Survey of India, Howrah, IN

Abstract

No Abstract.

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H. K. Kalita ¹, B. Talukdar ¹, R. A. Baishya ¹, S. Basumatary ¹, J. Das ², A. Dutta ¹, R. Ch. Barman ³, D. Sarma ¹

Affiliations
1 Department of Zoology, Gauhati University, Guwahati, Assam, IN
2 Department of Zoology, Goalpara College, Goalpara, Assam, IN
3 NFDB Regional Centre, Campus of NIRD, NERC, Khanapara, Guwahati, IN

Abstract

The study was conducted in a society pond of Gandhibasti village of Abhayapuri, Bongaigaon, Assam to assess the impact of duck droppings on water quality and pond productivity. The pond was integrated with ducks (Anas platyrhynchos) to obtain the benefit of duck litters on the pond productivity and fish growth. The mean dry weight of 80 ducks excreta was estimated as 3.864 kg/ha/day, discharging into the pond. 18,000 fingerlings. Indian major carps along with few exotic carp were stocked in the month of April, 2013. Supplementary feed was also given to the fishes in alternate days to ensure their steady growth. All the studied physico-chemical parameters were found within the permissible limit and the growth of fishes was also satisfactory. The maximum growth was recorded in Catla followed by silver carp, common carp, Rohu and Mrigala.

Keywords

Duck Dropping, Pond Productivity, Indian Major Carps, Integrated Farming.

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D. Sarma ¹, J. Das ¹, A. Dutta ¹

Affiliations
1 Department of Zoology, Gauhati University, Guwahati-781 014, Assam, IN

Abstract

Rogor is a commonly used pesticide in the agricultural field. The present study was undertaken to evaluate the lethal toxicity of Rogor, an organophosphorus pesticide, in freshwater fish Channa punctatus (Bloch) and relative behavioural changes after exposing for 96 hours. The regression equation calculated as y = 9.551x + 6.173 and the LC₅₀ value calculated for Channa punctatus was at 0.75 mL/L. During exposure, fish showed faster opercular activity, erecting dorsal and ventral fin, huge secretion of mucus from whole body, etc.

Keywords

Acute Toxicity, Channa punctatus, Rogor, LC₅₀.

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D. Sarma ¹, A. Dutta ²

Affiliations
1 Department of Zoology, Goalpara College, Goalpara-783 101, Assam, IN
2 Department of Zoology, Gauhati University, Guwahati, Assam, IN

Abstract

The ecology in terms of physico-chemical and biological properties of Urpod beel and Kumri beel of Goalpara district of Assam were assessed from 2001 to 2003. Physico-chemical properties of both the wetlands were observed favourable. Biological properties such as plankton population and primary productivity fluctuated within the permissible limits. However, eutrophication tendency appeared in both the wetlands due to autochthonous and allochthonous input.

Keywords

Goalpara, Riverine Wetlands, Urpod and Kumri Beels, Ecological Studies.

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