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7. Fish and shell fish fauna of the retting and nonretting zones of the Kadinamkulam kayal, Kerala

Author

Bijoy Nandan, S. and Abdul Azis, P.K.

Subjects
Kerala, Kadinamkulam, India, microbial contamination, marine fishes, Biology, estuaries
Abstract

Retting of coconut husk is one of the major problems of pollution in the estuaries (kayals) of Kerala. Retting activity has resulted in the mass destruction of the flora and fauna and has converted sizeable sections of the kayal into virtual cesspools of foul smelling stagnant waters. Levels of hydrogen sulphide, phosphate and BOD, increased while dissolved oxygen and fish and shellfish fauna decreased in the ambient waters. In the Kadinamkulam kayal a total of 37 species of fishes belonging to 26 families, 5 species of prawn and 2 species each of crabs and molluscs were recorded from the no retting zone, whereas only 20 species of fish in dead condition were collected from the rating zone. Prawns, crabs and molluscs were absent at the vetting zone. Majority of the fish fauna in the kayal were marine forms.

Published
1993

8. Protective role of carbon sequestration by free living nematodes in Arctic Kongsfjord (intermediate zone), Svalbard in the emerging climate change scenario

Author

Krishnapriya, P P, Aswathy, N K, Dhanya, M M, Jima, M, Jayachandran, P R, Bijoy Nandan, S, Harikrishnan, M, and Krishnan, K P

Abstract

The proportion of blue carbon contribution by benthic fauna with regard to climate change issue is a relevant topic recent times. The present study is focusing on the carbon potential and blue carbon contribution of meiobenthic nematodes in the intermediate zone of Arctic Kongsfjord during 2015–2017 and the study is the first of its kind from this region. Foraminifera and Nematoda were the dominant fauna in 2015; whereas it was Foraminifera in 2016 and Tintinnida and Nematoda in 2017. Significant difference was noticed in the community structure of meiofauna in this three consecutive years. Twenty six nematodes were identified from the intermediate zone and their individual carbon potential and total blue carbon during the above-mentioned period is estimated. Parasphaerolaimus paradoxus(7.14 ± 0.05 μg/mg) recorded the highest carbon potential and the lowest value was recorded in Terschellingia longicaudata(0.11 ± 0.3 μg/mg). The sediment factors such as sediment granulometric composition, salinity, pH, Eh and total organic carbon (TOC) were the leading factors influencing the meiofaunal distribution as well as the distribution of nematodes based on carbon potential in the intermediate zone. Investigation of blue carbon deposition by nematodes turned out to be relevant in mitigating the climatic change as the fjord has a tranquil nature.

Published
2021
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9. Invasion of biofouling mussel Mytilopsis Conrad, 1857 (Bivalvia: Dreissenacea) in the Cochin backwaters, southwest coast of India.

Author

JAYACHANDRAN, P. R., JIMA, M., JOSEPH, PHILOMINA, SANU, V. F., and BIJOY NANDAN, S.

Subjects
*MUSSEL culture, *BIOLOGICAL invasions, *INTRODUCED species, *WATER quality, *SPECIES distribution
Abstract

The article reports on a study on the occurrence of mussel Mytilopsis from the southwest coast of India. Using a standard multiparameter instrument, the basic water quality parameters were measured during the study. It refers to the confirmation of bioinvasive occurrence of Mytilopsis in the backwaters in Cochin, India.

Published
2018

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