The current state of the turbot, Scophthalmus maximus (Linnaeus, 1758), population in the northwestern part of the Black Sea

  • Bohdan Hulak
  • Yevhen Leonchyk
  • Volodia Maximov
  • George Tiganov
  • Vladislav Shlyakhov
  • Mikhail Pyatnitsky
Keywords: stock, assessment, Black, Sea, turbot, Stock, Synthesis, overfishing


Abstract. Turbot is one of the most valuable fish species in
the Black Sea commercial fishery. The serious, dramatic
depletion of the turbot stock and catches that began in the
1980s was caused by overfishing and poor ecological
conditions. The state of the turbot stock began to improve in
the northwestern part of the Black Sea in 2016. Landings were
at their 30-year maximum in this part of the sea. Catches per
unit effort (CPUEs) have been at a stable, high level there for
the last few years. Average turbot weight and length have also
been increasing. The Stock Synthesis (SS3) framework was
used in the stock assessment. According to SS3 analysis,
fishing mortality (F) reached the minimum level of 0.29 in
2018. The cumulative SPR (Spawner Potential Rate) index
was 0.27, which approximately equaled SPRMSY = 0.25. Thus,
currently the turbot stock is mostly moderately exploited at
a level close to the management target in the northwestern
part of the Black Sea. However, the entire Black Sea
population has not fully recovered yet.