Icthyofaunal diversity and ecological parameters of water of selected beels of Majuli Island have... more Icthyofaunal diversity and ecological parameters of water of selected beels of Majuli Island have been studied during May 2010 to April 2012. Beels were selected on the basis of feeding channels from two river systems viz. Subansiri and Brahmaputra. A total number of 67(Sixty seven) fishes belonging to 9 orders, 44 genera of 21 families were recorded. Out of 67 species of fishes recorded, the conservation status (CAMP, 1998) of 5 species were endangered, one critically endangered, 15 species were vulnerable, one data deficient and status of 30 species in lower risk category. The study shows that about 29% of fish species is in the threatened category. Certain physico-chemical parameters of the beel water (temperature, pH, Dissolved oxygen, free carbon dioxide, total alkalinity, hardness) were monitored and these parameters are in conformity with the water characteristics of beels of Assam.
Faunastic diversity in torrential habitats is scarce as animals with adaptive modifications suita... more Faunastic diversity in torrential habitats is scarce as animals with adaptive modifications suitable for the habitat can live in these systems. Fishes living in theses microhabitats are of ecological and commercial importance. Fish diversity of streams in two watersheds (Diyung theip and Panjali watershed) located at Tenga valley and Tippi area of West Kameng district, Arunachal Pradesh was studied from April 2009 to March 2012. Diying Kho River flows throughout the Tenga valley and its depth varies at different points ranging up to 1 meter. Panjali stream drains into the river Kameng. The fishes were recorded in pre monsoon, monsoon and post monsoon season. 21 species of fishes belonging to 2 orders, 4 families and 14 genera have been recorded. Cyprinids were the dominant group represented by 14 species belonging to 7 genera followed by Sisoridae with 4 species, Balitoridae with 2 species and Psilorhynchidae with one species. The IUCN status of the 21 species (1 species Vulnerable ...
ABSTRACT The present study on morphometry and sexual dimorphism is based on 32 fishes (18 males a... more ABSTRACT The present study on morphometry and sexual dimorphism is based on 32 fishes (18 males and 14 females) collected from Kamrup and Jorhat district of Assam. Sexual dimorphism was confirmed with Mann Whitney U test and three differences in characters viz. total length, depth of the body and length of pectoral fin were noted. The present data adds to the distributional information of this species in Assam, India.
Three new oribatid mite species of the genus Pergalumna (Galumnidae) are described from growing m... more Three new oribatid mite species of the genus Pergalumna (Galumnidae) are described from growing mosses on rocks near a water stream in India. Pergalumna paraclericata sp. n. is very similar morphologically to Carinogalumna clericata (Berlese, 1914), however, it differs from the latter by the structure of lamellar lines and number of notogastral porose areas. Pergalumna minipora sp. n. is very similar morphologically to Pergalumna bifissurata Hammer, 1972, however, it differs from the latter by the body size and the presence of prodorsal ridges and a median pore. Pergalumna paracattienica sp. n. is very similar morphologically to Pergalumna cattienica Ermilov & Anichkin, 2011, however, it differs from the latter by the number of notogastral porose areas and the body integument on the ventral plate.
Ichthyofaunal resources of Majuli, one of the largest river islands of the world were studied fro... more Ichthyofaunal resources of Majuli, one of the largest river islands of the world were studied from May 2010 to April 2011. The
objective was to verify with fresh collections, the distributional record of the fishes in lotic and lentic water bodies of the
island. During the survey period a total number of 82 (Eighty-two) species belonging to 10 orders, 54 genera of 23 families
were recorded. Cyprinidae family was dominant with 32 species followed by Bagridae and Channidae with 7 and 5 species
respectively. Out of 82 species of fishes recorded, the conservation status of 6 species were endangered, one critically
endangered,19 species vulnerable, one data deficient and status of 34 species in lower risk category. Fishes were categorized
into food fish (96.4%), ornamental fish (74.4%) and commercially important fishes (40.3%). The study shows that about 32%
of fish species is in threatened category being either vulnerable or endangered. Of the recorded fish species, 49% were lotic
fishes and rest were lentic species.
Icthyofaunal diversity and ecological parameters of water of selected beels of Majuli Island have... more Icthyofaunal diversity and ecological parameters of water of selected beels of Majuli Island have been studied during May 2010 to April 2012. Beels were selected on the basis of feeding channels from two river systems viz. Subansiri and Brahmaputra. A total number of 67(Sixty seven) fishes belonging to 9 orders, 44 genera of 21 families were recorded. Out of 67 species of fishes recorded, the conservation status (CAMP, 1998) of 5 species were endangered, one critically endangered, 15 species were vulnerable, one data deficient and status of 30 species in lower risk category. The study shows that about 29% of fish species is in the threatened category. Certain physico-chemical parameters of the beel water (temperature, pH, Dissolved oxygen, free carbon dioxide, total alkalinity, hardness) were monitored and these parameters are in conformity with the water characteristics of beels of Assam.
Faunastic diversity in torrential habitats is scarce as animals with adaptive modifications suita... more Faunastic diversity in torrential habitats is scarce as animals with adaptive modifications suitable for the habitat can live in these systems. Fishes living in theses microhabitats are of ecological and commercial importance. Fish diversity of streams in two watersheds (Diyung theip and Panjali watershed) located at Tenga valley and Tippi area of West Kameng district, Arunachal Pradesh was studied from April 2009 to March 2012. Diying Kho River flows throughout the Tenga valley and its depth varies at different points ranging up to 1 meter. Panjali stream drains into the river Kameng. The fishes were recorded in pre monsoon, monsoon and post monsoon season. 21 species of fishes belonging to 2 orders, 4 families and 14 genera have been recorded. Cyprinids were the dominant group represented by 14 species belonging to 7 genera followed by Sisoridae with 4 species, Balitoridae with 2 species and Psilorhynchidae with one species. The IUCN status of the 21 species (1 species Vulnerable ...
ABSTRACT The present study on morphometry and sexual dimorphism is based on 32 fishes (18 males a... more ABSTRACT The present study on morphometry and sexual dimorphism is based on 32 fishes (18 males and 14 females) collected from Kamrup and Jorhat district of Assam. Sexual dimorphism was confirmed with Mann Whitney U test and three differences in characters viz. total length, depth of the body and length of pectoral fin were noted. The present data adds to the distributional information of this species in Assam, India.
Three new oribatid mite species of the genus Pergalumna (Galumnidae) are described from growing m... more Three new oribatid mite species of the genus Pergalumna (Galumnidae) are described from growing mosses on rocks near a water stream in India. Pergalumna paraclericata sp. n. is very similar morphologically to Carinogalumna clericata (Berlese, 1914), however, it differs from the latter by the structure of lamellar lines and number of notogastral porose areas. Pergalumna minipora sp. n. is very similar morphologically to Pergalumna bifissurata Hammer, 1972, however, it differs from the latter by the body size and the presence of prodorsal ridges and a median pore. Pergalumna paracattienica sp. n. is very similar morphologically to Pergalumna cattienica Ermilov & Anichkin, 2011, however, it differs from the latter by the number of notogastral porose areas and the body integument on the ventral plate.
Ichthyofaunal resources of Majuli, one of the largest river islands of the world were studied fro... more Ichthyofaunal resources of Majuli, one of the largest river islands of the world were studied from May 2010 to April 2011. The
objective was to verify with fresh collections, the distributional record of the fishes in lotic and lentic water bodies of the
island. During the survey period a total number of 82 (Eighty-two) species belonging to 10 orders, 54 genera of 23 families
were recorded. Cyprinidae family was dominant with 32 species followed by Bagridae and Channidae with 7 and 5 species
respectively. Out of 82 species of fishes recorded, the conservation status of 6 species were endangered, one critically
endangered,19 species vulnerable, one data deficient and status of 34 species in lower risk category. Fishes were categorized
into food fish (96.4%), ornamental fish (74.4%) and commercially important fishes (40.3%). The study shows that about 32%
of fish species is in threatened category being either vulnerable or endangered. Of the recorded fish species, 49% were lotic
fishes and rest were lentic species.
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objective was to verify with fresh collections, the distributional record of the fishes in lotic and lentic water bodies of the
island. During the survey period a total number of 82 (Eighty-two) species belonging to 10 orders, 54 genera of 23 families
were recorded. Cyprinidae family was dominant with 32 species followed by Bagridae and Channidae with 7 and 5 species
respectively. Out of 82 species of fishes recorded, the conservation status of 6 species were endangered, one critically
endangered,19 species vulnerable, one data deficient and status of 34 species in lower risk category. Fishes were categorized
into food fish (96.4%), ornamental fish (74.4%) and commercially important fishes (40.3%). The study shows that about 32%
of fish species is in threatened category being either vulnerable or endangered. Of the recorded fish species, 49% were lotic
fishes and rest were lentic species.
objective was to verify with fresh collections, the distributional record of the fishes in lotic and lentic water bodies of the
island. During the survey period a total number of 82 (Eighty-two) species belonging to 10 orders, 54 genera of 23 families
were recorded. Cyprinidae family was dominant with 32 species followed by Bagridae and Channidae with 7 and 5 species
respectively. Out of 82 species of fishes recorded, the conservation status of 6 species were endangered, one critically
endangered,19 species vulnerable, one data deficient and status of 34 species in lower risk category. Fishes were categorized
into food fish (96.4%), ornamental fish (74.4%) and commercially important fishes (40.3%). The study shows that about 32%
of fish species is in threatened category being either vulnerable or endangered. Of the recorded fish species, 49% were lotic
fishes and rest were lentic species.