Scalefish Eastern Australian Salmon Biology

Biology

SpeciesArripis trutta
Common NameEastern Australian Salmon
ImportanceKey
HabitatOpen water
Depth≤ 30m (Edgar, 2008)
DistributionVictoria to Brisbane, around Tasmania (Edgar, 2008)
DietFish (pelagic predominantly) (Stewart et al. 2011)
Stock StructureSingle, well-mixed stock along south-eastern Australia
MovementTravel great distances between states; increased population mixing with increasing age and decreasing latitude (Stewart et al. 2011)
M (Natural Mortality)0.35 – 0.50 (Stewart et al. 2011)
Maximum Age (years)12 (potentially ≤26) (Stewart et al. 2011)
Maximum Length (cm)89 (Edgar, 2008)
Maximum Weight (g)9400 (Frimodt, 1995)
Female K (von Bertalanffy growth parameter)0.24
Male K (von Bertalanffy growth parameter)0.27
Female t0 (age (years) when length = 0)-0.15
Male t0 (age (years) when length = 0)-0.13
Female L (asymptotic von Bertalanffy length (fork length; cm))65
Male Loo (asymptotic von Bertalanffy length (cm))61.3
Size at Maturity
(length (fork length; cm) at which 50% of population are sexually mature)
42.13 (Stewart et al. 2011)
Age at Maturity
(age (years) at which 50% of population are sexually mature)
2.19 (Stewart et al. 2011)
Spawning SeasonOctober – March
Spawning LocationNew South Wales (Stewart et al. 2011)
Batch Fecundity
(F; number of eggs) to Fork Length (FL; cm)
F=14581e^(0.0659 L) (F = batch fecundity; L = fork length (cm))
Batch Fecundity
(F; number of eggs) to Age (A; years)
F=96604e^(0.227 A) (Stewart et al. 2011)
Early Life HistoryEggs, larvae and juveniles drift and migrate from spawning grounds to Tasmania and Victorian waters during autumn and winter. Juveniles (4–6 cm fork length) appear in shallow Tasmanian waters between January and September (Kailola et al. 1993)
Gillnet Post Release SurvivalLow: 20-62% depending on gillnet soak time (Lyle et al. 2014)