Marine fishery at Vizhinjam- A decadal analysis

The average annual marine fish landing of Vizhinjam during 2004-2013 fluctuated from 13,119 to 23,798 t registering an average catch of 1,9462 t. Standard effort fluctuated over the years with minimum of 53,772 during 2011 and maximum of 1,21,524 during 2005 with an average of 91,491 units. Pelagic finfishes contributed 78.4% to the total catch, followed by demersal finfishes (10.5%), crustaceans (0.8%) and molluscs (10.5%). Boat seine contributed 39% to the total catch, followed by drift gillnet (31%) and mechanised hooks and line (20%). Landings of major pelagic resources registered marginal increase till 2009, after which the catch decreased drastically. Tunas contributed 33.8% of the total pelagic landings followed by clupeids which formed 27.5%. Mackerel landings showed a gradual increase from 465 t in 2004 to 2,869 t in 2008 and subsequently declined with fluctuations in between. Carangids, one of the major resources also showed fluctuations in their landings with maximum landings during 2009. Trichiurids showed wide fluctuation, with peak landings during the period 2004-2007. Among demersal finfishes, perches formed 26.6% followed by elasmobranchs (21%) and flatfishes (10.4%). Crustacean landings which is highly seasonal showed a declining trend over the years. Penaeid prawns on an average formed 59.56% of total crustacean landings, followed by Acetes which constituted 20.7% and the rest by crabs. Total cephalopod production increased from 836 t in 2004 to 2,891 t in 2012 and comprised mainly squids and cuttlefish. Disappearance of gears such as Kolachivala, Achil and reduction in the effort of non-motorised crafts which operate gears like Chalavala, Netholivala as well as hooks & line were noticed during the present study.