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Effects of condition on fecundity and total egg production of eastern Scotian Shelf haddock (Melanogrammus aeglefinus)
Citation
Blanchard, JL and Frank, KT and Simon, JE, Effects of condition on fecundity and total egg production of eastern Scotian Shelf haddock (Melanogrammus aeglefinus), Canadian Journal of Fisheries and Aquatic Sciences, 60, (3) pp. 321-332. ISSN 0706-652X (2003) [Refereed Article]
Copyright Statement
Copyright 2003 NRC Canada
DOI: doi:10.1139/F03-024
Abstract
A fecundity study of the eastern Scotian Shelf haddock (Melanogrammus aeglefinus) stock during the 1997–
1999 spawning seasons is reported. We developed a model that accounted for fecundity changes at the individual level
and that could be used to estimate population egg production beyond the study period. Incorporating condition factors
into the model (relative condition factor (Kn) and hepatosomatic index) accounted for a significant proportion of the
residual variation. The model predicted that a change in Kn from 0.8 to 1.0 resulted in a twofold increase in fecundity
at length. This variability was as great as that observed for fecundity–length relationships among stocks. Three time
series (1979–2001) of total egg production (TEP) were constructed using different fecundity relationships: one with a
condition effect, one based on length only, and one based on weight only. The magnitude of change in TEP resulting
from the condition effect ranged from +30 to –20%. Condition effects during the first half of the time series resulted in
an enhancement of TEP, whereas in the latter half, condition effects depressed TEP. This evaluation of TEP generated
new insights into haddock stock dynamics but did not result in a dramatic improvement of the relationship between
recruitment and stock reproductive potential.
Item Details
Item Type: | Refereed Article |
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Keywords: | population dynamics, fecundity |
Research Division: | Biological Sciences |
Research Group: | Ecology |
Research Field: | Population ecology |
Objective Division: | Environmental Management |
Objective Group: | Management of Antarctic and Southern Ocean environments |
Objective Field: | Assessment and management of Antarctic and Southern Ocean ecosystems |
UTAS Author: | Blanchard, JL (Professor Julia Blanchard) |
ID Code: | 100516 |
Year Published: | 2003 |
Web of Science® Times Cited: | 53 |
Deposited By: | Sustainable Marine Research Collaboration |
Deposited On: | 2015-05-18 |
Last Modified: | 2015-09-01 |
Downloads: | 0 |
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