dc.contributor.advisor	Benakappa, S.
dc.contributor.advisor	Kulkarni, G.N.
dc.contributor.advisor	Dinesh Babu, A.P.
dc.contributor.advisor	Gangadhar Gowda
dc.contributor.advisor	Prathibha Rohit
dc.contributor.author	Mahesh, V.
dc.date.accessioned	2016-07-05T15:28:57Z
dc.date.available	2016-07-05T15:28:57Z
dc.date.issued	2014-10-15
dc.description	Ph.D. Thesis	en_US
dc.description.abstract	Trawling is one of the most efficient methods of catching fish world over and is also the most important human intervention causing physical disturbance to the continental shelves, and consequently, the physical destruction of ecosystems. Trawl fishery is generally a mixed fishery targeting a number of species and sizes, simultaneously. By-catch not only includes non-commercial species, but also commercial species that are below minimum legal size (MLS) or less profitable species owing to market conditions. Since the demand for fish meal is on the rise, more advanced technologies in fishing and vessel infrastructure are being introduced and practiced. These developments have resulted in heavy exploitation of juveniles of commercially important fishes and other ecologically important biota. At Mangalore Fisheries Harbour, it was estimated that in 2012-14, trawlers landed on an average 1.68 lakh t of fishes per year, of which 1.33 lakh t (79%) was retained for edible purpose and 0.35 lakh t (21%) was marked as “low value by-catch” (LVB) mainly for fish meal production. For assessing the sustainability of marine fisheries production it is imperative to understand the species composition and the juvenile composition of the fishes in the LVB. From the LVB, 121 species of finfishes were recorded in MDT. Juveniles of commercially important finfish species formed 47.53 % of the finfish LVB by weight (56.1% by number). An estimated 4,693.4 t (272.4 million in number) of Decapterus russelli juveniles, 1,395.7 t (144.9 million in nuamber) of Saurida tumbil and 1,671.4 t (142.9 million in number) of Rastrelliger kanagurta were landed as LVB per year by multiday trawlers. From the results it is evident that the trawlers equipped with advanced technologies in fishing and high storage capacity are intensively trawling to catch as much as possible without any concern over the size or the species of fish or the sustainability of the fishery. Since trawl fishery is the backbone of Indian marine fisheries bycatch is unavoidable in multi-species scenario. Bycatch problem to a large extent can be reasonably addressed by allowing trawling with nets with bigger mesh sizes, banning of trawling in certain seasons, effort reduction in critical fishing grounds and adoption of BRDs such as Juvenile Fish Excluder cum Shrimp Sorting Device (JFE-SSD) can bring down the damages to the ecosystems by reducing juveniles in by-catch considerably.	en_US
dc.identifier.uri	http://krishikosh.egranth.ac.in/handle/1/68515
dc.language.iso	en	en_US
dc.publisher	Karnataka Veterinary, Animal and Fisheries Sciences University, Bidar	en_US
dc.subject	land resources, yields, fruits, fungi, niger, imports	en_US
dc.title	Assessment of Juveniles in Trash Fish Landing from Trawlers of Mangalore	en_US
dc.type	Thesis	en_US

Assessment of Juveniles in Trash Fish Landing from Trawlers of Mangalore

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