Acta Adriatica, Vol. 65 No. 2, 2024.
Izvorni znanstveni članak
https://doi.org/https://doi.org/10.32582/aa.65.2.2
Bioecological lessons learned from the neonate longnose spurdogs Squalus blainville (Squaliformes: Squalidae) suggest a potential nursery ground in the Marmara Sea
Hakan Kabasakal
; Istanbul University, Institute of Science, Fisheries Technologies and Management Program, Istanbul, Türkiye
*
Uğur Uzer
; Istanbul University, Faculty of Aquatic Sciences, Department of Fisheries Technologies and Management, Istanbul, Türkiye
Onur Gönülal
; Istanbul University, Faculty of Aquatic Sciences, Department of Marine Biology, Istanbul, Türkiye
F. Saadet Karakulak
; Istanbul University, Faculty of Aquatic Sciences, Department of Fisheries Technologies and Management, Istanbul, Türkiye
* Autor za dopisivanje.
Sažetak
The capture of 176 neonate longnose spurdogs Squalus blainville (Risso, 1827), suggests a potential nursery ground
in the eastern Marmara Sea (GFCM GSA28). Sampling was performed by means of a scientific bottom trawl hauled at a
depth range of 121-126 m on 21 February 2024. Available data show that S. blainville may be captured in demersal fishery
within their first year of life. Total length (TL) and total weight (TW) of the examined males ranged from 169 to 279 mm
(238.4±20.7 mm) and from 21.4 to 117 g (66.5±19.8 g), respectively. The TL and TW of the examined females ranged from 187
to 292 mm (241.1±25.3 mm) and from 30.1 to 146 g (66.8±29.2 g), respectively. A male neonate (TL=169 mm) examined is
believed to be the smallest free-swimming longnose spurdog caught to date. Under current fisheries regulations, S. blainville
is a protected shark species in the waters of Türkiye and therefore should be released if caught as bycatch. However, in
addition to reducing fishing pressure on the species by prohibiting targeted fishing, area-based conservation actions, which
are based on closing areas that are critical for chondrichthyans (e.g., nurseries) to fishing either on a year-round or seasonal
basis, should now be included in the conservation plans for S. blainville and other protected species in Turkish waters.
Ključne riječi
Squalus, nursery, Marmara Sea, conservation, hypoxia
Hrčak ID:
320050
URI
Datum izdavanja:
12.8.2024.
Posjeta: 0 *