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Fishing power and standardised catch rates: Implications of missing vessel-characteristic data from the Australian eastern king prawn fishery

Braccini, J.M. and O’Neill, M.F. and Campbell, A.B. and Leigh, G.M. and Courtney, A.J. (2011) Fishing power and standardised catch rates: Implications of missing vessel-characteristic data from the Australian eastern king prawn fishery. Canadian Journal of Fisheries and Aquatic Sciences . pp. 1-36.

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Article URL: http://www.nrcresearchpress.com/toc/cjfas/69/5
Publisher URL: http://www.nrcresearchpress.com/journal/cjfas

Abstract

Standardised time series of fishery catch rates require collations of fishing power data on vessel characteristics. Linear mixed models were used to quantify fishing power trends and study the effect of missing data encountered when relying on commercial logbooks. For this, Australian eastern king prawn (Melicertus plebejus) harvests were analysed with historical (from vessel surveys) and current (from commercial logbooks) vessel data. Between 1989 and 2010, fishing power increased up to 76%. To date, both forward-filling and, alternatively, omitting records with missing vessel information from commercial logbooks produce broadly similar fishing power increases and standardised catch rates, due to the strong influence of years with complete vessel data (16 out of 23 years of data). However, if gaps in vessel information had not originated randomly and skippers from the most efficient vessels were the most diligent at filling in logbooks, considerable errors would be introduced. Also, the buffering effect of complete years would be short lived as years with missing data accumulate. Given ongoing changes in fleet profile with high-catching vessels fishing proportionately more of the fleet’s effort, compliance with logbook completion, or alternatively ongoing vessel gear surveys, is required for generating accurate estimates of fishing power and standardised catch rates.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Animal Science
Business groups:Agri-Science, Animal Science
Additional Information:Author version. © The State of Queensland (through the Department of Employment, Economic Development and Innovation) 2011
Keywords:Data imputation; fishing logbook compliance; trawl fishery; fisheries management.
Subjects:Science > Statistics > Statistical data analysis
Aquaculture and Fisheries > Fisheries > Fishery management. Fishery policy
Deposited On:06 Mar 2012 07:57
Last Modified:08 Jun 2015 15:59

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