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Salinity control on anchovy egg density

Anchovy egg density show a significant correlation with sea surface salinity in the Bay of Biscay.

The spatial variation of a single fish species egg density has never been reported, and although it is novel experimental evidence, it is an important parameter for modeling the vertical and spatial distribution of fish eggs. Anne Goarant and colleagues offer experimental data on the significant relationship between surface salinity and egg density, which can be directly assimilated into existing models vertical distribution and drift models. The measurement span from open ocean to coastal conditions representing a salinity range of 32.79 psu to 34.80 psu. Eggs were collected in variable sea surface conditions using a 1 meter square Carre net towed at 2 knots. Egg density is determined using a density gradient column apparatus of Cooms (1981), which varied between 22.51-25.27 sigma-t.

The dataset is just one of many to be included into the Vital Rates database to be developed between WP 4 and WP 3.1 between September 2007 and May 2008. The database will collate published datasets on the vital rates of species of key importance to end-to-end ecosystem modeling, and where necessary transform the data for ease of assimilation and/or parameterization of existing models.       

Reference:
Anne Goarant, Pierre Petitgas* and Paul Bourriau, 2007. Anchovy (Engraulis encrasicolus) egg density measurements in the Bay of Biscay: evidence for the spatial variation in egg density with sea surface salinity, Marine Biology 151: 1907-1915,    doi:10.1029/2006GL028605

*EUROCEANS PIs



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