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Figure 5. The typical migration of bluefin tuna in the Black Sea, the Bosphorus and the eastern Mediterranean
(SarĂ , 1963).

Figure 6. The fluctuation of fish abundance in the Black Sea according to the data from the Bulgarian fishery.
The catch curve concerning bluefin tuna is marked as 1 (from: Zaitsev & Mamaiev, 1997).

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