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MRINMAY GHORAI

Institution: Centre for Fisheries Research, Dept. of Zoology, Panskura Banamali College

Country: INDIA

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ICHTHYOFAUNAL DIVERSITY AND ECOLOGICAL SIGNIFICANT IN SUBARNAREKHA RIVER ESPECIALLY AT GHATSILA, EAST SINGHBUM DISTRICT IN JHARKHAND STATE.

http://anveshika.org/proceedings-of-the-zoological-society-of-india/wp-content/uploads/sites/2/2020/06/5-JUNE-2020.pdf

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Purba Medinipur- 721152 ,West Bengal, India. | *e-mail – mrghorai@gmail.com

Subarnarekha is one of the most important river in India and it originates from Nagri villege near Ranchi district in the state of Jharkhand it traverses through the three states in India ( Jharkhand, West Bengal and Orissa), and finally join into the bay of Bengal near kirtania port of Baleswar district in the state of Orissa. The present investigation deals with the freshwater fish diversity, distribution and conservation status with respect to physico-chemical parameter of the water habitat during study period ( February 2018 -August 2019) in the middle part of Subarnarekha river at Ghatsila.

Total 58 fish species belonging to 10 order, 21 families and 37 genera have been recorded from two sampling station during the study period. Study revealed that the family cyprinidae was the most dominant group contributing 45% of the total fish species followed by other families. The Shannon – Weiner diversity index and Simpson Dominance index of two different sampling station was indicated that,the highest fish diversity index were recorded at station -II (Raatmohna Riverside) is 3.774 followed by station -1 ( Galudih) is3.770. Out of 58 species, 47 species under least concern (LC), 5 species under near threatened (NT), only 3 species that was under Vulnerable(VU), 3 species under Data Deficient (DD) but there is no species which belonging to under endanger category.

The study also revealed that the river is gradually threatened by discharging of industrial (Hindustan Copper Limited) and domestic effluents, pollution (plastic, agriculture etc.), climate change and several anthropogenic activity. Meanwhile, it is suggested that the administration and local people need to be a legal action urgently for save the fish diversity in near future

ICHTHYOFAUNAL DIVERSITY AND LIMNOLOGICAL STUDY OF RIVER RUPNARAYAN AT PURBA MEDINIPUR DISTRICT (W.B.)

http://anveshika.org/proceedings-of-the-zoological-society-of-india/wp-content/uploads/sites/2/2019/06/2-june-19.pdf

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The fish community of the Rupnarayan river in relation to limnological parameters was studied by monthly samples taken from June-2016 to May-2017. This river is located at 220 25′ N latitude and 87052’E longitude situated at near Kolaghat of Purba Medinipur district of West Bengal. The riverine water is used for producing electricity of kolaghat thermal power station (KTPP), fishery and tourism activities. Fish collections were made with gill nets of standardized dimensions with several mesh sizes. Twenty three (23) fish fauna identified during the study belongs to Cyprinidae 8 species, Clupeidae, Bagridae and Siluridae with each 2 and 3 species and a species each of Engrauilidae, Gobiidae, Mastacembelidae, Ammassidae, Polinemidae, Schilbeidae, Anguilidae, and Mugilidae respectively. The Shanon- Weiner diversity index of up and down stream sampling station indicated a strong relationship with overall species richness showed variation and ranged from 3.00 to 2.83. The most dominant order Cypriniformes (29%) found to be dominant with 8 fish species followed by Siluriformes (25%) 6 species and Clupeiformes (23 %) 3 species. The species diversity is climax in post monsoon, coinciding with favourable conditions such as sufficient water and ample food resources. The diversity was low in pre monsoon probably due to the shrinkage of the water spread of the river. The high value of dissolved oxygen united with low biochemical oxygen demand and other nutrient levels indicate that the water body is moderately oligotrophic in nature. To put aside this diversity and to develop a sustainable fishery practices and proper documentation leading to diversity information system is an insistent need.