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Spawning biomass of jack mackerel (Trachurus declivis) off eastern Australia: critical knowledge for managing a controversial fishery


Ward, TM and Burnell, OW and Ivey, A and Sexton, SC and Carroll, J and Keane, J and Lyle, JM, Spawning biomass of jack mackerel (Trachurus declivis) off eastern Australia: critical knowledge for managing a controversial fishery, Fisheries Research, 179 pp. 10-22. ISSN 0165-7836 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 Elsevier B.V.

DOI: doi:10.1016/j.fishres.2016.02.005


Jack mackerel (Trachurus declivis) is a key target species of the Australian Small Pelagic Fishery. The fishery was subject to extensive public scrutiny following an attempt to introduce a large factory-trawler in 2012. One of the concerns raised related to the reliability and age of estimates of the spawning biomass of jack mackerel. This study reports on the first dedicated application of the Daily Egg Production Method (DEPM) to jack mackerel. Large numbers of samples of eggs and adults were collected concurrently from the key spawning area off eastern Australia during what has been previously identified as the main spawning period. This study established an effective adult sampling method and provides the first estimates for this species of adult reproductive parameters required for application of the DEPM. Estimates of all DEPM parameters, except batch fecundity, were based on relatively large sample sizes. The spawning biomass of jack mackerel off eastern Australia during January 2014 was estimated to be approximately 157,805 t (95% CI = 59,570–358,731 t). Sensitivity analyses indicate this estimate is robust to likely uncertainty in estimates of key parameters. Future research should focus on elucidating the size-fecundity relationship and spatial, temporal and size-related variations in spawning fraction.

Item Details

Item Type:Refereed Article
Keywords:jack mackerel, daily egg production method, spawning biomass, small pelagic fishery, Eastern Australia, Tasmania, factory trawler
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Aquaculture and fisheries stock assessment
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Wild caught fin fish (excl. tuna)
UTAS Author:Keane, J (Dr John Keane)
UTAS Author:Lyle, JM (Associate Professor Jeremy Lyle)
ID Code:106588
Year Published:2016
Web of Science® Times Cited:4
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2016-02-15
Last Modified:2017-11-03

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