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| Goarant, Anne; Petitgas, Pierre; Bourriau, Paul. |
| Knowledge of the pelagic vertical distribution of fish eggs is central for several aspects of fisheries science including fisheries recruitment and egg production studies. In modelling egg vertical distributions, variation in fish egg density is an important issue. Though variation in egg density between individual eggs has been reported, evidence for significant spatial variation in egg density is novel. The present study provides evidence that egg density of anchovy (Engraulis encrasicolus) varies spatially across spawning sites in the Bay of Biscay, depending on the regional scale variation in sea water properties due to river discharge. We measured the density of the eggs using a density gradient column at 17 stations in 2005 and 2006 as well as their... |
| Tipo: Text |
Palavras-chave: Bay of Biscay; Anchovy; Fish egg density; Density gradient column. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3007.pdf |
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| Huret, Martin; Bourriau, Paul; Gatti, Paul; Dumas, Franck; Petitgas, Pierre. |
| The size and specific gravity of eggs of marine pelagic fish partly determine their dispersal and survival. Using an original dataset of anchovy and sardine eggs, sampled in spring over the last decade in the Bay of Biscay, we provide a parameterization of these properties on ambient water temperature and salinity. We used the density gradient column for measurement of egg specific gravity. The column was also filled with homogeneous water for sinking velocity experiments. For anchovy, these experiments confirm that the effect of egg permeability through the chorion could be neglected when modelling sinking, while it has to be considered for sardine, its perivitelline space representing 78.6% (±6.2%) of the total egg volume, as opposed to 5–10% for most... |
| Tipo: Text |
Palavras-chave: Anchovy; Bay of Biscay; Density gradient column; Egg buoyancy; Egg permeability; Egg size; Sardine. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00346/45676/45326.pdf |
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