Browsing by Author "Neethiselvan, N"
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ThesisItem Open Access Analysis of Bycatch of Bottom Set Gill Nets of Thoothukudi Coast(TANUVAS, 2011) Kumar, Aniruth; TANUVAS; Sundaramoorthy, B; Neethiselvan, N; Sukumar, DReprintItem Open Access Analysis of Design Features of Fish Trawls and Shrimp Trawls of Thoothukkudi Coast(ANALYSIS OF TRAWL DESIgN, 2003) Neethiselvan, N; Brucelee, GThe investigation deals with the comparison of body ProPortions of fish trawls and coastal shrimp trawls of Thoothukkudi coast with each other and with those of a standard FAO fish cum shrimp trawl. Significant variations could be noticed between fish trawls and coastal shrimp trawls of Thoothukkudi coast with respect to Parameters viz. length of bottom wing, breadth of top bosum, breadth of bottom bosum, breadth and length of second belly as evidenced from low percentages of overlapping (<25%). The deviations observed in certain morphometric measurements of fish and coastal shrimP trawls from that of standard FAO fish cum shrimp trawl design stressed the need for improving the design features of the existing trawls of Thoothukkudi coast. The study suggested to increase the length of bottom wing and to reduce the belly breadth, belly depth, breadth of top and bottom bosum in fish trawls. Irrespective of the q?e, all trawls invariably had the cod end mesh size of 20mm. The study recommends fitting of square mesh panel of 30-mm mesh size in the cod end of fish and shrimp trawls of Thoothukkudi coast to exclude juvenile fishesReprintItem Open Access Comparative Fishing Efficiency of Lobster Traps(Fishery Technology, 2001) Balasubramanian, A; Kathavarayan, E; Neethiselvan, NFishing efficiency of lobster traps relies on various factors like design, shape and material of the trap and bait used. investigations on suitable design for lobster trap was attempted using six different designs such as rectangular with synthetic webbing, rectangular with steel wire, hemispherical, circular, semi-cylindrical and trapezoidal. The fishing efficiency of the traps differed significantly (p<0,01). Semicylindrical trap performed well by trapping 53 numbers of lobsters in 30 fishing operations.OtherItem Open Access Influence of Certain Herbal Additives on the Growth and Survival of White Sail Fin Molly (Poecillia Latipinna, Lesueur, 1821)(TANUVAS, 2010) Neethiselvan, N; Rani, V; Veerabhadran, K; Punniamurthy, NReprintItem Open Access A New Species of Cuttlefish ,Sepia vecchioni (Cephalopoda,sepiidae) from Colachal Coast, South India(Journal of American Science, 2010) Neethiselvan, N; Venkataramani, VKA new species of cuttlefish sepia vecchioni sp.nov. hitherto wrongly treated as. S. Prashadi Winck worth. 1936 collected from the Colachal fish landing centre (8^10' N. 77^15 'E) of South India is described. The dorsal mantle of S vecchioni sp.nov has distinct white stripes facing upwards in contrast to transervese Zebra type stripes with the ends facing downward on the closely related species. S Prashadi. Unlike S. Prashadi, a well-defined sexual dimorphism with respect to shape and length of arm is also seen in S.vecchioni sp.nov. In matired males of this species. the first and fourth pair of arms are greatly extended and the first pair is whip like. Males if this species also differ from that of S. Prashadi with regard to sucker arrangement on hectocotylized arm. Though both the species can be classified under Aeanthosepion species complex of Rochebrune (1984) by having weakly and incompletely clacified cuttlebone. The comprison of morphological characters, meristic characters and cuttlebone charecteristics of S.vecchioni sp.nov with that of other five closely related species of the genus sepia of world waters are also discussed. [ Journal of American Science 2010:6(4):12-21] (ISSN :1545-1003)ReprintItem Open Access A new species of cuttlefish Sepia ramani sp. nov. (Class : Cephalopoda) from Tuticorin Bay, southeast coast of India(Indian Journal of Marine Sciences, 2001-06) Neethiselvan, NA new cuttlefish Sepia ramani sp.nov. collected from Tuticorin Bay (8o48'N, 78o11' E), India, is described based on 50 specimens covering both-sexes with a comparison of the closely related species of the same genus, Sepia pharaonis. Sepia ramani sp.nov resembles S. pharaonis in morphological characters such as fins, funnel, head, buccal membrane and colour and in most of the morphometric characters. However, in S. ramani sp.nov, the tentacular club is long with 15-24 enlarged suckers and enlarged suckers are almost sub equal in size, in contrast to 6 enlarged medial suckers of which 3 to 4 suckers are greatly enlarged in S. pharaonis. Further, the left ventral arm in males of S. ramani.sp.nov is hectocotylised, with l4-16 basal series of quadriserially arranged normal suckers instead of 10-12 in S. pharaonis. Both the newly erected species and S. pharaonis belonging to Sepia sensu strico species complex as the inner cone of both the species are with plate like callosity and without any cavity.