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Trade-offs between life-history traits in a coldwater fish in the Mediterranean Sea: the case of blue whiting Micromesistius poutassou.
- Source :
-
Journal of fish biology [J Fish Biol] 2019 Aug; Vol. 95 (2), pp. 428-443. Date of Electronic Publication: 2019 May 30. - Publication Year :
- 2019
-
Abstract
- A combination of traditional and emerging methodologies was used to assess the trade-offs between several life-history traits (linked to reproduction and condition) and parasitism in a commercially-exploited cold-water species, blue whiting Micromesistius poutassou, in the Mediterranean Sea. The use of histological and gravimetric methods revealed conflicting evidence as to the fecundity type (indeterminate or determinate) of this species. Moreover, there seem to be condition-mediated compensations between egg quality and egg quantity. The effects of parasitism on reproduction and condition are species-specific and occur mainly at high intensities of infection; they include a lower batch fecundity (affecting reproductive potential), a higher hepatosomatic index and a higher spleen-somatic index. Considering the fact that larger fish spawn more eggs and that the minimum landing size is lower than the size at maturity, these results may have implications for the future management of M. poutassou stocks in the Mediterranean Sea. Local environmental conditions may account for geographical differences regarding infection in M. poutassou. Altogether, the results support the idea that the complex trade-offs between parasitism, reproduction and condition need to be considered in order to understand the status of cold-water species such as M. poutassou.<br /> (© 2019 The Fisheries Society of the British Isles.)
- Subjects :
- Animals
Female
Fertility
Fish Diseases epidemiology
Fish Diseases parasitology
Gadiformes growth & development
Health Status
Lipid Metabolism
Liver metabolism
Male
Mediterranean Sea epidemiology
Nematoda anatomy & histology
Nematoda classification
Nematode Infections epidemiology
Nematode Infections parasitology
Nematode Infections veterinary
Oocytes growth & development
Ovary anatomy & histology
Ovary cytology
Ovary physiology
Reproduction
Seafood
Species Specificity
Spleen anatomy & histology
Spleen physiology
Gadiformes physiology
Life History Traits
Subjects
Details
- Language :
- English
- ISSN :
- 1095-8649
- Volume :
- 95
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Journal of fish biology
- Publication Type :
- Academic Journal
- Accession number :
- 31038739
- Full Text :
- https://doi.org/10.1111/jfb.13993