I observed annual differences (about 2-3 weeks) regarding the arrival of horse mackerel in the romanian waters of the Black Sea (in the Danube Delta region). Sometimes arrive faster (1-10 August), and sometimes arrive later (15-20 August). Does anyone know why?
In this reserch paper (http://icesjms.oxfordjournals.org/content/61/5/774.full.pdf+html) the author suggest that migration among populations of the Black, Marmara, Aegean and Northeast Mediterranean Seas may be limited.
But probably by contacting Dott.ssa Maria Yankova you may find a better answer to your question.
I think you need to contact with colleagues from Institute Grigore Antipa Constanta.
Dear Daniel Cocan
please check the following resources
www.revolvy.com/.../index.php?s=List%20of%20fish%20of%20the%20Black%20Sea
https://www.ideals.illinois.edu/bitstream/handle/2142/10174/inhscaev01996i00010_opt.pdf?sequence=2
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