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Spatial assessment using geo-referenced diver data: a case study from North-West Tasmania

conference contribution
posted on 2023-05-24, 13:54 authored by Craig MundyCraig Mundy

Australian Abalone Fisheries typically target spatially structured stocks, often in remote areas. The nature of these fishing operations means precise recording of fishery-dependent data is challenging, and fishery independent data collection to determine stock status is cost prohibitive. Typically, we see that assessments of these fisheries are based on large reporting blocks, with imprecise data. Information on spatial structure and stock productivity, and dynamics of the fleet are typically lost. Dynamic international exchange rates, increasing aquaculture production, and rising fuel prices have created a changed economic climate, with a corresponding modification in harvest strategies employed by divers, or imposed by quota owners. This requires different and more precise methods of assessing fishery performance than was required previously.

Capturing the changes in fisher behaviour and fleet dynamic are central to attribution of changes in CPUE signals to stock decline or, changed harvest strategy, or both. An electronic data collection and analysis system has been developed at the University of Tasmania, using GPS and depth/time data loggers to collect high-resolution, high-quality spatial location and effort data from abalone divers. Between 2008 and 2010, use of GPS and depth data loggers was mandatory for fishing in small section of coast in North-west Tasmania. Performance measures utilising the geo-referenced diver data and hotspot analyses are utilised to assess the capacity of fine-scale electronic spatial data to detect serial depletion.

Funding

Fisheries Research & Development Corporation

History

Publication title

5th International Symposium on GIS/Spatial Analyses in Fisheries and Aquatic Sciences

Department/School

Institute for Marine and Antarctic Studies

Event title

5th International Symposium on GIS/Spatial Analyses in Fisheries and Aquatic Sciences

Event Venue

Wellington, New Zealand

Date of Event (Start Date)

2011-08-22

Date of Event (End Date)

2011-08-26

Repository Status

  • Restricted

Socio-economic Objectives

Wild caught edible molluscs

Usage metrics

    University Of Tasmania

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