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- Title
Reproductive strategy of a migratory fish stock: implications of spatial variations in natural mortality.
- Authors
Langangen, Øystein; Ottersen, Geir; Ciannelli, Lorenzo; Vikebø, Frode B.; Stige, Leif Christian
- Abstract
We investigate how the reproductive strategy in a migratory marine fish may be influenced by spatial variations in mortality in early life stages. In particular, we examine how spawning time and location affect offspring survival and growth. A drift model for early life stages (eggs to age 1) of the Barents Sea cod ( Gadus morhua) is combined with empirical estimates of spatial variation in mortality at two different life stages. We examine seasonal and interannual differences in survival and growth in offspring originating from two spawning grounds, with the central site requiring higher migration distance, and hence cost, than the northern site. When accounting for spatially explicit mortality fields, central and northern spawned offspring have about equal survival, as do early and late spawned offspring. Furthermore, central spawned offspring grow faster and are likely to reach a larger size compared with northern spawned offspring. Our results indicate that the fitness benefit of southward migration in the Barents Sea cod is not mainly due to higher early survival of offspring, but rather due to effects of offspring acquiring a larger size.
- Subjects
MIGRATORY fishes; SPATIAL variation; FISH mortality; ATLANTIC cod; SPAWNING; SURVIVAL behavior (Animals)
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2016, Vol 73, Issue 12, p1742
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2015-0321