Development and evaluation of egg-based stock assessment methods for blue mackerel (Scomber australasicus) in southern Australia
SARDI Food Safety and Innovation
Principal Investigator: J.P. Keane, M. Lowry, L.J. McLeay, F.J. Neira, J.R. Ovenden, P.J. Rogers, R.J. Saunders, D. Schmarr, T.M. Ward, I.D. Whittington and D. Williams
1. To synthesise information available on the fisheries for blue mackerel in southern Australia. (Note that information on the biology of blue mackerel will be reviewed as part of the objectives that deal specifically with age and growth, reproductive biology, stock assessment, etc.).
2. To describe thestock structure of blue mackerel in south-eastern Australia.
3. To estimate the number, size, frequency and total weight of blue mackerel taken by recreational (charter, gamefish and trailer boat) fishers of the New South Wales coast.
4. To describe the spatial and temporal patterns of age and growth and compare the age structure of commercial catches and fishery independent samples of blue mackerel taken from throughout southern Australia.
5. To compare the spatial and temporal patterns of age commercial and recreational catches samples of blue mackerel taken from NSW.
6. To describe reproductive biology, especially spawning fractions and batch fecundity, of blue mackerel in South-eastern Australia.
7. To establish methods and criteria for identifying and staging the eggs and larvae of blue mackerel.
8. To estimate the distribution and abundance of eggs and larvae of small pelagic species in south eastern Australia (Scomber australasicus, Trachurus spp., Sardinops sagax, Engraulis australis, Etrumeus teres)
9. To develop and evaluate methods for estimating the spawning biomass of blue mackerel in southern Australia.
10. To evaluate potential harvest strategies for blue mackerel in southern Australia and provide preliminary estimates of the potential yields for each zone of the Commonwealth fishery