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Whitby, New Zealand

Breen P.A.,Breen Consulting | Branson A.R.,4 Roys Road | Bentley N.,Trophia | Haist V.,Haist Consultancy | And 4 more authors.
Fisheries Research | Year: 2016

The history and management of the New Zealand fishery for the rock lobster Jasus edwardsii is described. The fishery was essentially open-access to 1979, with limited input controls. Access was strictly limited from 1979 to 1989, but effort increased to a peak in 1985, when the fishery was fully exploited. Early stock assessments suggested over-exploitation. Quotas were introduced in 1990 and catches were reduced from their then mean levels to promote stock rebuilding. Subsequently, the commercial fishing industry has exercised stewardship initiatives to maintain stocks. Operational management procedures have been developed and introduced since 1996. While overall catch is similar to 1990 levels, catch per unit of effort has more than doubled. Successes and challenges for future management are discussed. © 2016 Elsevier B.V.

Freeman D.J.,Research and Development Group | Breen P.A.,Breen Consulting | Macdiarmid A.B.,NIWA - National Institute of Water and Atmospheric Research
Canadian Journal of Fisheries and Aquatic Sciences | Year: 2012

The effects of fishing on growth in a spiny lobster, Jasus edwardsii, were explored by using a no-take marine reserve as a control for these effects. We analysed data from lobster tag-recapture studies outside the reserve from 1975 until the present and tag-recapture from inside the reserve during a recent 8-year study. We explored whether recent and historical data showed similar growth and, using catch per unit effort (CPUE) data from research potting and commercial returns, whether growth rates in this lobster species were affected by population density. Despite the confounded nature of the data, recent growth rates appeared to be lower than in earlier years, growth appeared weakly density-dependent, and the reserve appeared to have a positive effect on lobster growth. The strongest effect was the time period, but the density-dependent and reserve effects appeared real. The reserve effect suggests a negative effect of handling of sublegal-sized lobsters on growth.

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