Anchovy (<Emphasis Type="Italic">Engraulis encrasicolus</Emphasis>) egg density measurements in the Bay of Biscay: evidence for the spatial variation in egg density with sea surface salinity |
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Authors: | Anne Goarant Pierre Petitgas Paul Bourriau |
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Institution: | 1.Department Ecology and Models for Fisheries,IFREMER,cdx 3, Nantes,France |
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Abstract: | 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 diameter. At station, the variability in the individual egg density was statistically distributed according
to a Gaussian probability function. Significant variation in the mean egg density was observed across stations. Mean egg density
displayed a significant correlation with sea surface salinity. Results are discussed in light of the mechanisms determining
the egg density. |
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