REVIEW OF THE SIZE DISTRIBUTION OF CAGED EASTERN BLUEFIN TUNA (THUNNUS THYNNUS) IN TURKISH FARMS 2014-2020
Collective Volume of Scientific Papers ICCAT, cilt.78, sa.3, ss.159-169, 2021 (Hakemli Dergi)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 78 Sayı: 3
- Basım Tarihi: 2021
- Dergi Adı: Collective Volume of Scientific Papers ICCAT
- Derginin Tarandığı İndeksler: Other Indexes
- Sayfa Sayıları: ss.159-169
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- İstanbul Üniversitesi Adresli: Evet
Özet
During the 2018 stock assessment of East-Bluefin tuna it was noted substantial changes in the
size distribution of caged bluefin in Turkish farms in the period 2017/2018. The size distribution
of the caged fish is measured by the Stereo-camera systems when transferred from the towing
vessel to the farm cages. A review of the time series of available stereoscopic measures (2014-
2020) confirmed that changes in the overall size-distribution of caged fish. Since 2017, the
proportion of fish size 100-140 SFL cm increased substantially while the proportion of larger
fish >200 SFL cm has reduced. Analyses with auxiliary data indicated that the fishery has
concentrated in the months of June – July, while no spatial expansion of the PS fleet has been
observer, however the number of fishing operations and number of PS vessels participating has
increased to complete the allocated BFT catch in recent years.