Plaice egg mortality: can we determine survivorship?
In: Journal of Sea Research. Elsevier/Netherlands Institute for Sea Research: Amsterdam; Den Burg. ISSN 1385-1101; e-ISSN 1873-1414, more
Also appears in:Geffen, A.J.; Nash, R.D.M.; van der Veer, H.W. (Ed.) (2003). Proceedings of the Fifth International Symposium on Flatfish Ecology, Part I. Port Erin, Isle of Man, 3-7 November 2002. Journal of Sea Research, 50(2-3). Elsevier: Amsterdam. 87-270 pp., more
|  |
| Keywords |
Cells > Sexual cells > Eggs
Environmental effects > Temperature effects
Population functions > Mortality
Survival
Pleuronectes platessa Linnaeus, 1758 [WoRMS]
ANE, Irish Sea [Marine Regions]
Marine/Coastal |
| Author keywords |
plaice; Pleuronectes platessa; egg production; GAM; Irish Sea |
| Authors | | Top |
- Dickey-Collas, M., more
- Fox, C.J.
- Nash, R.D.M.
- O'Brien, C.M.
|
|
|
| Abstract |
The daily mortality rate of cohorts of plaice eggs in the Irish Sea is estimated throughout the spawning season in 1995 and 2000, using general additive models of egg production. Daily mortality (z) was found to vary between 0.15 and 0.29. Mortality rates declined through the season in 1995 but not in 2000. There were significant differences in the mortality rates of individual cohorts of eggs. The suitability of an exponential decay model to describe daily mortality is discussed. The mortality rates conform to previously described relationships between fish eggs and temperature. The estimates of mortality rate were found to be robust to imprecision in egg ageing, but ageing imprecision led to a bias in the estimation of survivorship of eggs from spawning to hatch. The bias will vary with mortality rate. |
|
