- Gokcen Bilge
Muğla Sıtkı Koçman University, Faculty of Fisheries, 48000, Kötekli, Muğla, Turkey
gbilge@mu.edu.tr
- Halit Filiz
Muğla Sıtkı Koçman University, Faculty of Fisheries, 48000, Kötekli, Muğla, Turkey
halit.filiz@mu.edu.tr
Keywords: Painted comber, Serranidae, sagittae, ototlith biometry
Abstract
Sagittal otoliths are widely used in stomach content analysis in fisheries biology, other than
age determination or ichthyo-archeological studies, because they have species specific
morphological features. And, also there is strong relationships between fish and otolith size.
So, it is possible determine size and species of the prey fishes in the digestive system of the
piscivorous aquatic predators. In this study, the relationships were calculated between sagittal
otoliths (otolith length (OL), height (OH) and weight (OW)) and fish size (length (TL),
weight (W)) in painted comberSerranus scriba (Linnaeus, 1758) specimens (N=763, 68–241
mm in TL and 3.66–228.72 g) captured via bottom trawl vessels from off the Gulluk Bay
(Southern Aegean Sea) between January and December 2013. Regression equations were
calculated as follows: TL= 20.11*OL+40.28, TL= 44.07*OH+50.24, TL= 969.1*OW0.410
,
W= 1.212*OL2.194, W= 11.16*OH1.850, W= 5913*OW–12.22, OH= 0.218*OL+1.213, OW=
0.00045*OL1.843, OW= 0.002*OH1.672. Left otolith pairs were used for calculations, because
no statistical differences between left and right otoliths (p>0.05). Calculated regressions were
displayed a high coefficient of determinations ranging between 0.822-0.890. The linear and
non-linear functions provided the best fit for %44 and %56, respectively. The aim of this
study was to examine the otolith and fish size relation of S. scriba in the southern Aegean Sea
in order to provide a reliable tool for researchers studying food habits of top predators to
determine the size and weight of prey fish from the length or weight of the otoliths recovered.