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Hartill B.W.,NIWA - National Institute of Water and Atmospheric Research | Cryer M.,New Zealand Ministry of Fisheries | Lyle J.M.,University of Tasmania | Rees E.B.,New Zealand Ministry of Fisheries | And 5 more authors.
North American Journal of Fisheries Management | Year: 2012

Fisheries managers are becoming increasingly aware of the need to quantify all forms of harvest, including that by recreational fishers. This need has been driven by both a growing recognition of the potential impact that noncommercial fishers can have on exploited resources and the requirement to allocate catch limits between different sectors of the wider fishing community in many jurisdictions. Marine recreational fishers are rarely required to report any of their activity, and some form of survey technique is usually required to estimate levels of recreational catch and effort. In this review, we describe and discuss studies that have attempted to estimate the nature and extent of recreational harvests of marine fishes in New Zealand and Australia over the past 20 years. We compare studies by method to show how circumstances dictate their application and to highlight recent developments that other researchers may find of use. Although there has been some convergence of approach, we suggest that context is an important consideration, and many of the techniques discussed here have been adapted to suit local conditions and to address recognized sources of bias. Much of this experience, along with novel improvements to existing approaches, have been reported only in “gray” literature because of an emphasis on providing estimates for immediatemanagement purposes. This paper brings much of that work together for the first time, and we discuss how others might benefit from our experience. © American Fisheries Society 2012. Source


Evans K.,CSIRO | Patterson T.A.,CSIRO | Reid H.,New Zealand Ministry of Fisheries | Harley S.J.,New Zealand Ministry of Fisheries
PLoS ONE | Year: 2012

Southern bluefin tuna (SBT) appear to comprise a single stock that is assumed to be both mixed across its distribution and having reproductive adults that are obligate, annual spawners. The putative annual migration cycle of mature SBT consists of dispersed foraging at temperate latitudes with migration to a single spawning ground in the tropical eastern Indian Ocean. Spawning migrations have been assumed to target two peaks in spawning activity; one in September-October and a second in February-March. SBT of sizes comparable to that of individuals observed on the spawning ground were satellite tagged in the Tasman Sea region (2003-2008) and demonstrated both migrations to the spawning grounds and residency in the Tasman Sea region throughout the whole year. All individuals undertaking apparent spawning migrations timed their movements to coincide with the second recognised spawning peak or even later. These observations suggest that SBT may demonstrate substantial flexibility in the scheduling of reproductive events and may even not spawn annually as currently assumed. Further, the population on the spawning grounds may be temporally structured in association with foraging regions. These findings provide new perspectives on bluefin population and spatial dynamics and warrant further investigation and consideration of reproductive schedules in this species. © 2012 Evans et al. Source


Hill N.A.O.,New Zealand Ministry of Fisheries | Michael K.P.,NIWA - National Institute of Water and Atmospheric Research | Frazer A.,New Zealand Ministry of Fisheries | Leslie S.,New Zealand Ministry of Fisheries | Leslie S.,Canadian Department of Fisheries and Oceans
Ocean and Coastal Management | Year: 2010

Local ecological knowledge (LEK) has been recognised as an important source of information for resource management in data-poor fisheries. Our case study of the Foveaux Strait dredge oyster fishery in New Zealand shows LEK can also make a significant contribution to the management of data-rich fisheries, but highlights the importance of appropriate data collection design and interpretation and presentation of LEK. We formalise a structure for interpreting LEK, illustrate the importance of design by comparing two LEK studies, and discuss how the inclusion of LEK into the fisheries plan process has provided unexpected benefits for better management of the fishery. © 2010 Elsevier Ltd. Source

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