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Spawning Dynamics and Size Related Trends in Reproductive Parameters of Southern Bluefin Tuna, Thunnus maccoyii

Knowledge of spawning behaviour and fecundity of fish is important for estimating the reproductive potential of a stock and for constructing appropriate statistical models for assessing sustainable catch levels. Estimates of length-based reproductive parameters are particularly important for determi...

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Published in:PloS one 2015-05, Vol.10 (5), p.e0125744-e0125744
Main Authors: Farley, Jessica H, Davis, Tim L O, Bravington, Mark V, Andamari, Retno, Davies, Campbell R
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cited_by cdi_FETCH-LOGICAL-c692t-52756b9e0d5917b8c7bfdab30ee63dd7ab0e89172fca44327740d326471a4d8a3
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Davis, Tim L O
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description Knowledge of spawning behaviour and fecundity of fish is important for estimating the reproductive potential of a stock and for constructing appropriate statistical models for assessing sustainable catch levels. Estimates of length-based reproductive parameters are particularly important for determining potential annual fecundity as a function of fish size, but they are often difficult to estimate reliably. Here we provide new information on the reproductive dynamics of southern bluefin tuna (SBT) Thunnus maccoyii through the analysis of fish size and ovary histology collected on the spawning ground in 1993-1995 and 1999-2002. These are used to refine previous parameter estimates of spawning dynamics and investigate size related trends in these parameters. Our results suggest that the small SBT tend to arrive on the spawning ground slightly later and depart earlier in the spawning season relative to large fish. All females were mature and the majority were classed as spawning capable (actively spawning or non-spawning) with a very small proportion classed as regressing. The fraction of females spawning per day decreased with fish size, but once females start a spawning episode, they spawned daily irrespective of size. Mean batch fecundity was estimated directly at 6.5 million oocytes. Analysis of ovary histology and ovary weight data indicated that relative batch fecundity, and the duration of spawning and non-spawning episodes, increased with fish size. These reproductive parameter estimates could be used with estimates of residency time on the spawning ground as a function of fish size (if known) and demographic data for the spawning population to provide a time series of relative annual fecundity for SBT.
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1932-6203
language eng
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subjects Age
Animal reproduction
Animals
Biological research
Biology
Bluefin tunas
Body Size
Commercial fishing
Demographics
Engraulis mordax
Estimates
Fecundity
Female
Females
Fertility - physiology
Fish
Fisheries
Fishing
Histology
Indonesia
Mathematical models
Observations
Oceans
Oocytes
Organ Size
Ovary - anatomy & histology
Ovary - physiology
Parameter estimation
Physiology
Population (statistical)
R&D
Regression analysis
Reproduction - physiology
Research & development
Seasons
Sexual behavior
Spawning
Statistical analysis
Statistical models
Thunnus maccoyii
Thunnus thynnus
Trends
Tuna
Tuna - anatomy & histology
Tuna - physiology
Variance analysis
title Spawning Dynamics and Size Related Trends in Reproductive Parameters of Southern Bluefin Tuna, Thunnus maccoyii
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