Reproductive biology and per-recruit analyses of striped trumpeter (Latris lineata) from Tasmania,Australia: Implications for management |
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| Affiliation: | 1. Institute of Marine and Antarctic Studies, Private Bag 49, University of Tasmania, Hobart 7001, Australia;2. CSIRO''s Digital Productivity Flagship, Hobart, Australia;1. School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey LL59 5AB, UK;2. Departamento de Zoología y Antropología Física, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain;3. Grupo de Recursos Marinos y Pesquerías, Facultad de Ciencias, Universidade da Coruña, 15008 A Coruña, Spain;4. Dipartimento di Ecologia, Università della Calabria, 87030 Rende CS, Italy;5. Barrabés Next, C. Serrano 16-1, 28001 Madrid, Spain;1. University of Tasmania – Tasmanian School of Business and Economics, Private Bag 84, Hobart, Tasmania 7001, Australia;2. Institute for Marine and Antarctic Studies – Taroona, Private Bag 49, Hobart, Tasmania 7001, Australia;1. University of Alaska Fairbanks, School of Fisheries and Ocean Sciences, 17101 Point Lena Loop Rd., Juneau, AK 99801, USA;2. University of Alaska Fairbanks, School of Fisheries and Ocean Sciences, 905 N Koyukuk Drive 245 O''Neill, PO Box 757220, Fairbanks, AK 99775-7220, USA |
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| Abstract: | This paper profiles the reproductive biology of and investigates the resilience of Tasmanian striped trumpeter under different levels of fishing pressure and size at entry to the fishery using per-recruit analysis. The spawning season around Tasmania occurs in the austral spring, with peak spawning activity in September and October. Size at 50% maturity was estimated at 543 mm fork length (FL) for females (estimated age = 6.8 years) and 529 mm FL for males (estimated age = 6.2 years). Striped trumpeter is a multiple spawner with batch fecundity estimates ranging from 205,054 for a 2 kg fish (540 mm FL) to 2,351,029 for a 9.5 kg fish (800 mm FL). At the current minimum legal size limit of 450 mm total length (equivalent to approximately 425 mm FL), yield-per-recruit was estimated to be close to maximum, and spawning biomass-per-recruit (SPR) ranged from 35 to 52% of virgin stock, depending on the mortality estimates used. Although these SPR are at a level considered sustainable, this methodology does not incorporate temporal variability, specifically recruitment variability. Therefore, conservative management measures are recommended until a dynamic model is applied to the striped trumpeter population. |
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