Age, growth and mortality of hake larvae (Merluccius hubbsi) in the north Patagonian shelf
Brown, D.R.; Leonarduzzi, E.; Machinandiarena, L. (2004). Age, growth and mortality of hake larvae (Merluccius hubbsi) in the north Patagonian shelf. Sci. Mar. (Barc.) 68(2): 273-283. https://dx.doi.org/10.3989/scimar.2004.68n2273
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358; e-ISSN 1886-8134, meer
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Age
Chordata > Vertebrates > Fishes > Osteichthyes > Gadiformes > Marine fishes > Hake
Developmental stages > Larvae
Hake
Otoliths
Population functions > Growth
Population functions > Mortality
PSW, Patagonian Shelf
Merluccius hubbsi Marini, 1933 [WoRMS]
Patagonian Shelf [Marine Regions]
Marien/Kust |
| Auteurs | | Top |
- Brown, D.R.
- Leonarduzzi, E.
- Machinandiarena, L.
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| Abstract |
Age and growth and mortality rates were estimated in Argentinean hake (Merlucius hubbsi) larvae by counting and measuring otolith daily increments. Larvae were captured with a Bongo net in January and February 2001. Length-at-age data were represented by a linear model whose fitted expression was: L(t) = 0.156 t + 1.7. Slope represented mean the daily growth rate (0.156 mm/day). This value was quite similar to the values recorded by other authors for larvae of other Merluccius species. Individual growth rates were not significantly different between January and February. This homogeneity in the larval growth was coincident with the great thermal homogeneity recorded between months. Statistical analysis of the larval growth rates from different areas did not show significant differences. Daily mortality coefficients derived from the exponential decline models were 0.27 and 0.12 for January and February respectively. The difference between the two mortality coefficients could be attributable to the patchinnes, or larval recruitment pulses of distinct intensity between the two months. |
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