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Technical annual report 2000-01



Technical annual report 2000-01


Dept. of Regional Development, Primary Industry, Fisheries and Resources technical annual report; Department of Regional Development, Primary Industry, Fisheries and Resources technical and annual report; Reports; PublicationNT; Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295




Made available via the Publications (Legal Deposit) Act 2004 (NT).






Agriculture -- Northern Territory -- Periodicals; Fisheries -- Northern Territory -- Periodicals

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Dept. of Primary Industry and Fisheries

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Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295



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Technical Annual Report 2000/01 269 Barramundi (Lates calcarifer) 2001 Project Officer: R. Griffin Main Features Fishery Status or Development Stage: Fully exploited in some areas, under-exploited in others. Stock Assessment Reliability: The assessment is considered very reliable. Stock Assessment Method: Analysis of time series of commercial catch and effort data. Age structure, surplus production and delay difference models. Commercial Harvest 2000: 825 tonnes barramundi, 312 tonnes threadfin salmon. Value of commercial harvest (including byproducts): $5.4m Annual average based on most recent five-year trend (commercial): Catch: Rising, average 672 tonnes Effort: Stable, average 30,400 100 metre net days. Recreational Harvest 2000: Not known about 300 tonnes in 1995. Total number of commercial licences issued: Number of licensed fishing guides: 26 155 (116 active) 60% of effort targeting barramundi). Management Arrangements: Commercial: Input controls. Limited entry - 26 licences, each with a net length limit (usually 1,000 m, some less). Mesh size limits. Spawning season closure (1 October to 31 January). Area limitations. Recreational: Output controls, size and possession limits. Licensing of guides. Commercial Fishery Background: The commercial fishery is managed by input controls. Only 26 licences are issued. Legislation prohibits commercial fishing inside the mouths of most rivers and creeks, limiting activities to the coastal zone. Commercial operators target barramundi in the three to eight-year old age group using gillnets. The kind and size of nets used is regulated. A maximum of 1000 m of net is allowed to be used (some licences are restricted to less). Nets with a minimum mesh size of 150 mm (6 in) are allowed for most tidal mud flats while 175-mm (7 in) mesh is allowed for use in the rivers, which remain open to the commercial fishery. A minimum legal fish length of 55 cm applies. Catch and Value The commercial barramundi fishery developed rapidly in the 1970s to the point of overexploitation. Radical reduction of effort in the 1980s has led to a recovery of stocks and stability in the industry (Figure 1). In the late 1980s and 1990s reallocation of parts of the resource to the recreational sector has occurred. The 2000 barramundi catch of 825 t is slightly higher than the previous year (809 t). It is much higher than the five-year average of 672 t. The value of the commercial catch of all species retained in the barramundi fishery in 2000 was $5.4 million. Of this, $4.6 million was for barramundi and $0.6 million for threadfin.