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Öğe Age and growth of the four-spotted megrim (Lepidorhombus boscii Risso, 1810) from Saros Bay (Northern Aegean Sea, Turkey)(Natl Centre Marine Research, 2013) Cengiz, O.; Ozekinci, U.; Ismen, A.; Oztekin, A.In this study, the growth parameters of the four-spotted megrim, (Lepidorhombus boscii Risso, 1810), were studied in Saros Bay, which had been closed to bottom trawl fishing since 2000. The sex ratio of females to males was 1:0.42. Length-weight relationships were W=0.0032L(3.31) and W=0.0069L(3.04) for females and males, respectively. Growth parameters of the populations were L-infinity=49.8 cm, k=0.09 year(-1)=-2.15 year for females; L-infinity=39.1 cm, k=0.11 year(-1), t(0)=-2.59 year for males. The growth performance index (Phi') was found to be 2.35 and 2.23 for females and males, respectively.Öğe Age, growth, reproduction and feed of longnosed skate, Dipturus oxyrinchus (Linnaeus, 1758) in Saros Bay, the north Aegean Sea(Wiley, 2010) Yigin, C.; Ismen, A.The age, growth, reproduction, and feeding of longnosed skate (Dipturus oxyrinchus) were studied using 179 specimens from the Saros Bay (North Aegean Sea) between March 2005 and December 2007. Composition was 49.7% females and 50.3% males. Total length of females ranged from 14.9 to 100 cm (disc width, 9.8-65 cm), and of males from 15.2 to 86.5 cm (disc width, 10-57.5 cm). Total length-weight and disc width-weight relationships are described by the equations W = 0.0008*TL3.35 and W = 0.0043*DW3.29, respectively. The age data, derived from vertebrae readings, were used to estimate the growth parameters of the von Bertalanffy equation: L-infinity = 256.46 cm, K = 0.04 year(-1), t(0) = -1.17year. The maximum age was 9 years. Males matured at 64-65 cm (disc width, 43.5 cm) and females at 82-83 cm TL (disc width, 53 cm). The stomach contained mainly Parapenaus longirostris, IRI: 93.47%.Öğe Age, growth, reproduction and feeding of John Dory, Zeus faber (Pisces: Zeidae), in the Saros Bay (North Aegean Sea)(Wiley-Blackwell, 2013) Ismen, A.; Arslan, M.; Yigin, C. C.; Bozbay, N. A.The age, growth, reproduction, sexual maturity and stomach content of John Dory (Zeus faber), caught in the Bay of Saros (North Aegean Sea) between September 2006 and September 2008, were investigated. The female-male ratio was 1.6 : 1. The total length of females ranged from 13.8 cm to 52.8 cm, and of males from 12.2 cm to 42.9 cm. The length-weight relationship was W = 0.0174*L2.936. Age data derived from vertebral centra readings were used to estimate the growth parameters of the von Bertalanffy equation. Growth parameters for females were L8 = 58.50 cm K = 0.11 year-1, t0 = -0.99 year and for males L8 = 45.01 cm, K = 0.13 year-1, t0 = -1.17 year. Maximum age was 18 years for females and 17 years for males. Length at first maturity for both females and males was 25.4 cm. Monthly values of the gonadosomatic index indicated that spawning occurred mainly in two peaks: one between January and June, and the other from August to September. Stomach content analysis showed the most-preferred prey to be Pisces (IRI% 97.3).Öğe Effect of twine thickness on selectivity of gillnets for bogue, Boops boops, in Turkish waters(Natl Centre Marine Research, 2011) Ayaz, A.; Altinagac, U.; Ozekinci, U.; Ozen, O.; Altin, A.; Ismen, A.To investigate the effect of twine thickness on the selectivity of multifilament gillnet targeting bogue, Boops boops L., four different stations were sampled between March and November 2008 in the North Aegean Sea. Gillnets with 22, 23, and 25 mm nominal mesh size (bar length) each having two different twine thicknesses (approximately 0.45 mm and 0.54 mm empty set) were applied for this purpose. The deviances from the SELECT method revealed that lognormal models provided the best fits for both of the twine thicknesses. Results from the two-way ANOVA analyses revealed that the mean total lengths increased with the mesh size (F = 87.36; df = 2; P < 0.0001) and decreased with the twine thickness (F = 46.12; df = 1; P < 0.0001). The 22 mm mesh size net (0.45 mm empty set) captured significantly larger fish than the 23 mm mesh size net (0.54 mm empty set), probably due to the higher elasticity and flexibility of the thinner twine. Thus, fisheries' managers should take into consideration twine thickness while advising mesh size regulations in gillnet fisheries.Öğe Length-weight relationships for seven rays from Saros Bay (North Aegean Sea)(Wiley-Blackwell Publishing, Inc, 2009) Yigin, C. C.; Ismen, A.[Anstract Not Available]Öğe Length-weight relationships for ten shark species from Saros Bay (North Aegean Sea)(Wiley, 2009) Ismen, A.; Yigin, C. Cigdem; Altinagac, U.; Ayaz, A.P>Length-weight relationships are presented for ten shark species sampled with a commercial trawl vessel at depths ranging from 5 to 500 m between March 2005 and June 2008 in Saros Bay, Turkey. The values of the exponent b of the length-weight relationships ranged from 2.6816 to 3.6060.Öğe Northernmost record of the dusky spinefoot Siganus luridus in the Aegean Sea (Turkey coast)(Cambridge University Press, 2015) Ismen, A.; Ayaz, A.; Yildirim, Z.D.This record represents the northernmost occurrence of Lessepsian migrant fish Siganus luridus in the Aegean Sea. A single specimen was caught off the coast of Assos, Edremit Bay, in November 2014 by trammel net at a depth of about 2-3 m on a sandy, rocky bottom mixed with Posidonia. Here, the morphometric and meristic characteristics of the specimen are identified and the dispersion of the species in the Mediterranean Sea is briefly discussed. © 2015 Marine Biological Association of the United Kingdom.Öğe Weight-length relationships of 63 fish species in Saros Bay, Turkey(Blackwell Publishing, 2007) Ismen, A.; Ozen, O.; Altinagac, U.; Ozekinci, U.; Ayaz, A.Weight-length relationships are presented for 63 fish species sampled with a commercial trawl vessel at depths ranging from 28 to 370 m between February 2005 and April 2006 in Saros Bay, Turkey. Saros Bay was closed to trawl fishery in 2000, thus, most of the demersal fish species sampled were relatively undisturbed.
