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Trawl codend selectivity estimates for goldband goatfish

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dc.contributor.author Madhu, V.R.
dc.contributor.author Meenakumari, B.
dc.contributor.author Panda, S.K.
dc.date.accessioned 2014-02-22T04:57:03Z
dc.date.available 2014-02-22T04:57:03Z
dc.date.issued 2010
dc.identifier.citation Proceedings of the National Seminar on Conservation and Sustainability of Coastal Living Resources of India, 1-3 December 2009, Cochin, ed.by Meenakumari, B. et.al 360-369 en_US
dc.identifier.uri http://hdl.handle.net/123456789/1574
dc.description.abstract The knowledge of selectivity of commercially important gears is vital for effective monitoring, management and sustainable exploitation of fishery resources. Using selective gears help to minimize the capture of juveniles by regulating the length at first capture, increasing the yield per recruit of targeted species and also by helping in the reduction of discards generated by the fishery (Armstrong et a/., 1990: MacLennan, 1992). Demersal otter trawls contribute more than a quarter of the global landed marine catch (estimated at approximately 86 million tonnes in 2004) (Kelleher, 2005). Due to the frequent use of small mesh size and operating in the near shore areas, these vessels generate disproportionately high quantities of bycatch (Andrew and Pepperell, 1992; Kelleher, 2005). Numerous studies have been carried out to test the utility of alterations to the size and or shapes of mesh used in the trawls to reduce the bycatch (Broadhurst, 2000; Madsen, 2007). Mesh opening of the codend (Wileman et al., 1996), twine diameter (Sala et al., 2007), material used for the fabrication of the codend (Tokac et al., 2004), speed of the tow (Dahrn et al., 2002), seasonal changes (Ozbilgin and Wardle, 2002), codend circumference (Broadhurst and Kennelly. 1996; Broadhurst and Millar, 2009), catch weight (Erickson at al., 1996) and the shape of the mesh opening (Broadhurst and Kennelly, 1996; He, 2007) are the main factors that affect the selectivity of the codends. In addition to the above factors, considerable amount of between-haul variations in selectivity can occur when the experiments are carried out in replicate hauls (Fryer, 1991). This variability need to be taken into account so as to make the selectivity estimates more reliable (Macbeth at al., 2005). Overdispersion in the data can be quantified using the replication estimate of dispersion (REP), which accounts for the overdispersion due to scaling up of sub-samples and the between-haul variations (Millar et al., 2004). en_US
dc.language.iso en en_US
dc.publisher Society of Fisheries Technologists (India) en_US
dc.subject Goatfish en_US
dc.subject fishery resources en_US
dc.subject commercial fishing en_US
dc.subject harvesting en_US
dc.subject fishing en_US
dc.subject trawl codend en_US
dc.title Trawl codend selectivity estimates for goldband goatfish en_US
dc.type Article en_US

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