Turkish Journal of Fisheries and Aquatic Sciences
2021, Vol 21, Num, 6 (Pages: 283-290)
Effects of Lunar Phases and Other Variables on CPUE of European Pilchard, Sardina pilchardus, Caught by Purse Seine in the Eastern Mediterranean
Zafer Tosunoglu 1 ,Tevfik Ceyhan 1 ,Ozlem Gulec 1 ,Faik Ozan Duzbastilar 1 ,Muharrem Hakan Kaykac 1 ,Celalettin Aydin 1 ,Gülnur Metin 1
1 Ege University, Faculty of Fisheries, 35100, Bornova, Izmir, Turkey
DOI :
10.4194/1303-2712-v21_6_03
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European pilchard Sardina pilchardus (Walbaum, 1792) is one of the most dominant
small pelagic landed by purse seine in Turkey as well as Mediterranean. In this study,
we aimed to identify relationships between the seasonally adjusted CPUE and changes
of the sea surface temperature (SST), fishing area, moon phase, and light used in the
purse seine fishery to understand the impact of changes on the CPUE of pelagic fishes,
especially S. pilchardus, by a total of 214 operations in Izmir Bay, Aegean Sea. The
effect of the parameters on the Sardine CPUE, expressed in terms of kg (haul day)–1
,
was examined by means of the Generalized Additive Modelling (GAMs) techniques.
The CPUE values for S. pilchardus were between 0 – 16.800 kg (haul day)–1 and the
mean CPUE was 1 844.3±176.6 kg (haul day)–1
. The smallest median was 441 kg (haul
day)–1
for full moon and the differences between the CPUE values of lunar phases were
statistically significant (p<0.05). Furthermore, there is a linear relationship between
CPUE and SST. In conclusion, the CPUE varied under hydrographic variables mostly SST
for sardine purse seine fishery in the Aegean Sea.
Keywords :
European sardine, Lunar Effects, Sea Surface Temperature, Generalized Additive Modelling, Aegean Sea