Mortality rates of 0-group plaice (Pleuronectes platessa L.), dab (Limanda limanda L.) and turbot (Scophthalmus maximus L.) in European waters: II. Comparison of mortality rates and construction of life table for 0-group
Beverton, R.J.H.; Iles, T.C. (1992). Mortality rates of 0-group plaice (Pleuronectes platessa L.), dab (Limanda limanda L.) and turbot (Scophthalmus maximus L.) in European waters: II. Comparison of mortality rates and construction of life table for 0-group. Neth. J. Sea Res. 29(1-3): 49-59
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579; e-ISSN 1873-1406, more
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| Authors | | Top |
- Beverton, R.J.H.
- Iles, T.C.
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| Abstract |
This paper collates and compares the available published and unpublished estimates of mortality rates of demersal 0-group plaice, dab and turbot on their nursery grounds of the North Sea and adjacent coastal waters. Seasonal and spatial variations account for some but not all of the observed differences. The consolidated phase mortality rates throughout the first year from hatching onwards are then checked against independent data of the total egg-production and numbers of age 1 recruits for the 1986, 1987 and 1988 year-classes of plaice. From this analysis a revised life-table for the first year of life of North Sea plaice is constructed. The mortality rate of dab from mid-summer to the end of the first year is well correlated with that of plaice in the same location at the same time, suggesting that the main causes of mortality during this phase of the life-history are the same in both species. The only available estimate of the mortality rate of demersal 0-group turbot is within the upper part of the range for plaice. The demographic implications of these findings are examined and significant gaps identified in the present knowledge of the quantitative early life-history of these species. |
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