Influence of the Seasonal Thermocline on the Vertical Distribution of Larval Fish Assemblages Associated with Atlantic Bluefin Tuna Spawning Grounds

نویسندگان

چکیده

Temperature is often an important variable influencing the vertical position of fish larvae in water column. The same species may show different distributions areas with a strong near-surface seasonal thermocline compared to isothermal regions. In surface thermocline, tuna significant preference for warmer layers. Little known regarding larval distribution waters and on associated assemblages. We conducted stratified sampling using methodology fishing device (MOCNESS) two major spawning Atlantic bluefin (BFT): western Mediterranean Sea (MED), characterized by Gulf Mexico (GOM) which lacks thermal stratification. Tuna occupied upper 30 m both areas, but average depth was consistently deeper GOM. MED, assemblages explained temperature, such as BFT, Thunnus alalunga, Ceratoscopelus maderensis, among others, coexist above are separated from Cyclothone braueri Hygophum spp. (found below thermocline). GOM, environmental correlates were salinity fluorescence. Mesopelagic taxa spp., had shallower than Lampanyctus Myctophum

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ژورنال

عنوان ژورنال: Oceans

سال: 2021

ISSN: ['2673-1924']

DOI: https://doi.org/10.3390/oceans2010004