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    Element concentrations in the swimbladder parasite Anguillicola crassus (nematoda) and its host the European eel, Anguilla anguilla from Asi River (Hatay-Turkey)
    (Springer, 2008) Genc, Ercument; Sangun, M. Kemal; Dural, Meltem; Can, M. Fatih; Altunhan, Cem
    The European eel's swimbladder nematode, Anguillicola crassus, sampled from the Asi River (Orontes River) in Antakya (Hatay, Turkey) in May 2006 were analysed by Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES) for their some heavy metal (Cd, Cr, Cu, Fe, Hg, Mn, Pb and Zn) levels. The metal concentrations of the parasites were compared to different organs (swimbladder, liver, muscle and skin) of the fish hosts. The parasite contained statistically highly significantly amounts of Fe (P < 0.05). The iron level of nematode was up to 25.52 times than the muscle of its host, Anguilla anguilla. However, bioconcentration of Cd, Cr, Cu, Hg, Mn, Pb, Zn were detected in the A. crassus and it contained no statistically differences with the other tissues of its host, the eel (P > 0.05). Furthermore, no significant differences were detected in the heavy metal accumulations between the parasitized and un-parasitized fish tissues. The analysed metals (Cd, Cr, Cu, Fe, Mn, Pb and Zn) were found in fish muscle at mean concentrations under the permissible limits proposed by FAO.
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    Growth and Reproductive Properties of Flathead Trout (Salmo platycephalus Bhenke, 1968) Population from Zamanti Stream, Seyhan River, Turkey
    (Central Fisheries Research Inst, 2011) Kara, Cemil; Alp, Ahmet; Can, M. Fatih
    In this study the growth and reproductive features of the flathead trout (Salmo platycephalus) found in the IUCN red list of threatened species in Zamanti Stream of Seyhan River were investigated. The population was composed of 50.44% female, 40.71% male and 8.85% immature individuals. The fork lengths (cm) and total weights (g) of the individuals varied between 11.3 to 40.1 cm and 19.7 to 988.7 g, respectively. Ten age groups (1 to 10) were identified in the population and majority of the sample was between 26.0 to 38.0 cm (69.91%) and 36.28% was between 410 and 660 g in weight. The length-weight relationship for all sample was W = 0.016*FL(2.938) with R(2) = 0.989. The growth parameters was estimated as; L(infinity)=60.78 cm, K=0.091 and to= -1.72. The condition factors varied from 1.04 to 1.93 and the differences in condition between female and male was not significant (P>0.05). According to 051 and agg dimaters, spawning period was determined between October and December. Mean fecundity was 2,398 egg/fish, egg diameters was between 4.387 and 5.408 mm (mean diametrers was 4.782 mm) on mature individuals in reproductive periods.
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    Investigation on the catch composition, catch per unit effort, and economic analysis of four different mesh sizes of bottom gill nets with the same hanging ratio used in the Ataturk Dam Lake
    (Ege Univ, 2005) Can, M. Fatih; Igne, Kadir Duran
    Four different mesh size of bottom gillnets (110 mm, 120 mm, 130 mm and 140 mm) with same hanging ratio were used to determine their catch composition and the catch per unit effort (CPUE). This research was carried out in fishing zone of the Bozova Town, between 01.08-31.12.2003. During the study 7 fish species belong to 4 different family were caught as follows; Cyprinus carpio (Linnaeus, 1758) (Cyprinidae), Carasobarbus luteus (Heckel, 1843) (Cyprinidae), Capoeta trutta (Heckel, 1843) (Cyprinidae), Tor grypus (Heckel, 1843) (Cyprinidae), Silurus triostegus (Heckel, 1843) (Siluridae), Mastacembelus simack (Banks ve Solander, 1794) (Mastecembalidae) and Oncorhynchus mykiss, (Walbaum, 1792) (Salmonidea). Total catch record in number was 791 fish and in weight was 789 kg. The highest mean CPUE values in gill nets for different mesh size by species were resulted as follows; Cyprinus carpio; 0.402 +/- 0.2865 kg/hour with 100 mm mesh size, Carasobarbus luteus; 0.765 +/- 0.6657 kg/hour with 140 mm mesh size, Tor grypus; 0.840 +/- 0.5469 kg/hour with 140 mm mesh size and Capoeta trutta; 0.181 +/- 0.1012 kg/hour with 140 mm mesh size. To cover the fishing cost, the gill nets with 110, 120 and 130 mm mesh size should be used at least 5 times, whereas the gill net with 140 mm mesh size should be used at least 3 times.
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    Morphometric relationship of length-weight and chelae length-width of eastern white river crayfish (Procambarus acutus acutus, Girard, 1852), under culture conditions
    (Wiley, 2007) Mazlum, Y.; Can, M. Fatih; Eversole, A. G.
    Length-weight (TL vs WWT) and chelae length-width (ChL vs ChW) relationships were described for juveniles, males and females, and for form I and form II males of Procambarus acutus acutus. The length-weight relationships for juveniles, form I, form II males, and females could be described as: WWT = 5 x 10(-3) TL3.09, WWT = 6 x 10(-3) TL3.61, WWT = 6 x 10(-9) TL3.26, and WWT = 6 x 10(-4) TL3.5, respectively. In all forms, growth was allometric (P < 0.05). The ANCOVA test indicated that slopes and intercepts of the length-weight regressions were significantly different between sex and sexual stages. The regressions for chelae length-width relationships for form I and form II males, and females were: ChW = -0.81 + 0.27CL, ChW = -0.33 + 0.25CL, and ChW = -0.82 + 0.32CL, respectively. Although the slope and intercepts of regressions for ChL and ChW were similar for those of form I and form II males, the slopes and intercepts of regressions of females were significantly different from form I and form II males. No statistical difference was observed in mean ChL between form II males and females (P > 0.05), but a significant difference was detected in mean ChL between form I and form II males (P < 0.05) and form I and females (P < 0.05). Form I males had longer ChL than form II males and females. The same trend was observed in mean ChW for form I and form II males, but a significant difference was detected between form II males and females (P < 0.05). In addition, results indicated that chelae lengths and widths increased allometrically with total length (TL) for both sex and sexual stages.
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    A preliminary study on population structure and abundance of Plesionika martia (A. Milne-Edwards, 1883) (Decapoda : Pandalidae) in the deepwater of the northeastern Mediterranean
    (Ege Univ, 2006) Can, M. Fatih; Aktas, Mevlut; Demirci, Aydin
    This study was conducted between 12 and 13 June 2004 in the deep waters of the northeastern Mediterranean Sea. A commercial trawl vessel was used and total 6 hauls were done to get some preliminary information on the population structure and abundance of red shrimp, Plesionika martia (A. MilneEdwards, 1883). A total of 50 specimens were sampled. The overall sex ratio, 1 male : 6.14 female, was significantly biased towards females (p<0.05). The mean carapace length (CL +/- SD) and mean weight (W +/- SD) of males and females were calculated as 59.28 +/- 14.49 mm (43-77 mm), 7.58 +/- 3.16 g (4.16-11.73 g), 73.62 +/- 9.24 mm (44-87 mm) and 12.13 +/- 3.88 g (4.5-19,7 g), respectively. Significant differences were detected between mean carapace length and weight of males and females (p<0.05). The ratios of red shrimp in the total catch and in the total shrimp catch were calculated as 5.53 % and 6.84 %, respectively. P. martia specimen were observed in the three out of six hauls. The catch per unit effort in the third haul was 4.5 kg/h, in the forth hauls was 2 specimen/h, and in the fifth haul was 2 specimen/h.
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    Temporal Variability in Abundance of Demersal Fish Community from Izmir Bay, Turkey
    (Medwell Online, 2009) Can, M. Fatih; Tosunoglu, Zafer; Ozaydin, Okan; Demirci, Aydin; Guder, H. Salih; Aydin, Celalettin; Leblebici, Semih
    Temporal variabilities of demersal fish species were analaysed in terms of their numerical abundance in the Izmir Bay. A total of 545559 specimen belonging to eight different families were caught in 2005, covering all the year using a R/V trawl. The contribution of each family was Sparidae (34.38%), Serranidae (22.25%), Bothidae (15.09%), Mullidae (14.22%), Gobidae (3.71%), Centracanthidae (1.01%) and Uranoscopidae (0.28%). Based on temporal variabilities of the families, cluster analysis identified three main groups, which were group-I: the Mullidae, group-II: the Centracanthidae, Uranoscopidae, Bothidae, Gobidae and Serranidae and finally group-III: the Sparidae and Triglidae. The family belonging to the first group was more abundant in cold months (picked in January) than others. The second group were more yielded in general from June-October (picked in October). The third group were more abundant in May and June.