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Abstract:

The results of the data analysis in two of surveys by vessels with longline (November, 2013 and October-2014) show that: the isothermal24^oC and the maximum layer of chlorophyll-a contentwas distributed at the same depth at under the homogeneous heat layer of surface.The isothermal 20°C was distributed upper of the centre thermocline layer.The isothermal 15°C and maximum salinity at the same depth were under the thermocline layer. The depth of hooks ranged 20-100m, in that time hooks in depth 20-40m was 33%, 40 -70m was 50% and 16% at the depth of about 70-100m. The hooks did not reach the depths of the deeper layers with isothermal of 15°C.The depth of the hooks almost was in the upper the centre thermocline layer and temperature at key hooks range 22-30^oC, average 27^oC, this is not the optimal temperature for big eyes tuna, and swordfis.

Keyword: Thermocline, Isothermal, maximum chlorophyll-a content, longline, offshore