The physical and chemical processes of the sea greatly affect the reproductive biology of fishes,mainly influencing both the numbers of spawned eggs and the survivorship of early stages up to therecruitment period. In the central Mediterranean, the European anchovy constitutes one of the mostimportant fishery resource. Because of its short living nature and of its recruitment variability, associatedto high environmental variability, this small pelagic species undergo high interannual fluctuation in thebiomass levels. Despite several efforts were addressed to characterize fishes spawning habitat from theoceanographic point of view, very few studies analyze the air-sea exchanges effects. To characterize thespawning habitat of these resources a specific technique (quotient rule analysis) was applied on air-seaheat fluxes, wind stress, sea surface temperature and turbulence data, collected in three oceanographicsurveys during the summer period of 2004, 2005 and 2006. The results showed the existence of preferredvalues in the examined physical variables, associated to anchovy spawning areas. Namely, for heat fluxesthe values were around −40 W/m2, for wind stress 0.04–0.11 N/m2, for SST 23 ◦C, and 300 − 500 m3s−3for wind mixing. Despite the obtained results are preliminary, this is the first relevant analysis on theair-sea exchanges and their relationship with the fish biology of pelagic species.
|Numero di pagine||8|
|Rivista||THE EUROPEAN PHYSICAL JOURNAL. B, CONDENSED MATTER PHYSICS|
|Stato di pubblicazione||Published - 2008|