TY  - JOUR
T1  - Estimating gillnet selectivity of Bluefish (Pomatomus saltatrix) by morphology
TT  - Lüferin (Pomatomus saltatrix) morfolojisiyle galsama ağı seçiciliğinin tahmini
AU  - İlkyaz, Akın Türker
PY  - 2018
DA  - March
DO  - 10.12714/egejfas.2018.35.1.14
JF  - Ege Journal of Fisheries and Aquatic Sciences
JO  - EgeJFAS
PB  - Ege Üniversitesi
WT  - DergiPark
SN  - 2148-3140
SP  - 89
EP  - 94
VL  - 35
IS  - 1
LA  - en
AB  - The dataset of thestudy consists of total length, fork length, head girth, maximum girth andweight measurements of 136 bluefish. The relationship between the total lengthand fork length of the product was TL=1.1348×FL-0.8184; the relationship between thetotal length and weight was W=0.0103×L2.97. The relationshipsbetween the total length and head girth and between the total length andmaximum girth of the sample were linear: the relationship of the total lengthand head girth was Ggill=0.5092×TL-0.0874;the relationship of the total length and maximum girth was Gmax=0.5989×TL-0.8540. The statistical relationship between lengthand girth was used to obtain a theoretical gillnet selectivity equation for thespecies. In conclusion, a relationship of S(l)=Φ[(C-Ggill)/0.4952]×[1-Φ((C-Gmax)/0.4255)] wasdetermined between the stretched size of the mesh used in bluefish fishing andthe catch rate. Using this equation, and considering the legal length andlength at first maturity, the minimum mesh size of the gillnet for sustainablefishery was determined.
KW  - Direct estimation
KW  - Sechin method
KW  - length-girth relationship
KW  - length-length relationship
KW  - length-weight relationship
N2  - Çalışmanın veri setini, 136 adet lüfer balığı üzerinde yapılan; totalboy, çatal boy, operkulum çevresi, vücut çevresi ve ağırlık ölçümlerioluşturmaktadır. Türün total boyu ile çatal boyu arasında TL=1,1348×FL-0,8184, total boyu ileağırlığı arasında ise W=0,0103×L2,97 şeklinde birilişki olduğu tespit edilmiştir. Örnekleme ait total boy-operkulum çevresi vetotal boy-vücut çevresi arasında ise sırası ile Ggill=0,5092×TL-0,0874 ve Gmax=0,5989×TL-0,8540 şeklinde doğrusalbir ilişkinin olduğu hesaplanmıştır. Boy ile çevre arasında kurulanistatistiksel ilişkiler kullanılarak, türe ait kuramsal uzatma ağı seçicilikdenklemi elde edilmiştir. Sonuç olarak, türün avcılığında kullanılabilecek ağıntam göz boyu ile yakalanma oranları arasında S(l)=Φ[(C-Ggill)/0,4952]×[1-Φ((C-Gmax)/0,4255)] şeklinde birilişkinin olduğu tespit edilmiştir. Elde edilen bu denklemden faydalanılarak,türün yasal ve ilk üreme boyları dikkate alınarak, sürdürülebilir bir avcılık içinkullanılacak sade uzatma ağının minimum tam göz boyunun ne olması gerektiğibelirlenmiştir.
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UR  - https://doi.org/10.12714/egejfas.2018.35.1.14
L1  - https://dergipark.org.tr/tr/download/article-file/439797
ER  -