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Öğe Age and growth of stargazer (Uranoscopus scaber L., 1758) in the southeastern Black Sea(Wiley, 2007) Demirhan, S. A.; Can, M. F.; Seyhan, K.A sample of 346 Uranoscopus scaber (L., 1758) was collected from the southeastern Black Sea between January 2002 and May 2005 in order to provide information on age, growth, length-weight relationship, and stomach contents of this species. Total length and total weight of sampled fish ranged from 5.2 to 21.9 cm and from 2.0 to 182.5 g, respectively. The sex ratio (1 : 1.98) was biased toward females (P < 0.05). Isometric growth was determined in the population. Length-weight relationships for all individuals were described by the parameters: a = 0.0167, b = 3.00, with the r(2) = 0.99. The population was composed of five age-classes (I-V years). The von Bertalanffy growth parameters (+/- SE) and confidence limit (CL, 95%) for the entire population were: L-infinity = 26.31 +/- 0.838 cm (CL: 24.66-27.96), k = 0.339 +/- 0.023 1/year (CL: 0.294-0.385), and t(o) = 0.087 +/- 0.0346 year (CL: 0.019-0.155) (r(2) = 0.96). Growth performance index (Phi) was 2.37. The diet was composed of Gobius sp. (2.2%),Trachurus trachurus (2.1%), Merlangius merlangus euxinus (4.3%) and unidentified fish species (17.4%); 39.1% were unidentified remains.Öğe Age, growth and food composition of Scorpaena porcus (Linnaeus, 1758) in the southeastern Black Sea(Wiley, 2009) Demirhan, S. A.; Can, M. F.Samples of 525 Scorpaena porcus (Linnaeus, 1758) were collected from the southeastern Black Sea between January 2002 and May 2003 for information on age, growth, length weight relationships and stomach contents. Total length of sampled fish ranged from 4.6 to 22.9 cm and total weight from 1.3 to 220 g. The sex ratio (1 : 1.61) was biased toward females (P < 0.05). Positive allometric growth was determined in the collected samples. The length-weight relationship for all individuals was described by the parameters a = 0.0149 and b = 3.09, with r(2) = 0.99. The sample was composed of five age-classes (0-7 years). Three growth models were used to identify the growth characteristics: von Bertalanffy, L-t = L-inf[1 - exp(-k(t - t(0)))]; logistic, L-t = L-inf/[1 + ((L-a - L-0)/L-0)][exp(-rt)]; and Schnute and Richards, L-t = L-inf[1 + alpha exp(-at(c))]((-1/b)). Among these, the Schnute and Richards model was best fitted to the data as L-t = 21.34[1 + 2.38exp(-0.34t(1.58))]((-1/0.99)) The diet was composed of Carcinus mediterraneus (18.2%), Crangon crangon (12.1%), unidentified crab species (10.6%), Gobius sp. (4.6%), Palaemon sp. (4.5%), Macropipus sp. (4.5%), Engraulis encrasicholus (1.5%), Gastropoda (1.5%), and unidentified remains (34.9%).Öğe Length-weight relationships for nine species of batoids from the Iskenderun Bay, Turkey(Wiley-Blackwell, 2012) Basusta, A.; Basusta, N.; Sulikowski, J. A.; Driggers, W. B., III; Demirhan, S. A.; Cicek, E.Presented are lengthweight relationships for Rhinobatos rhinobatos, Rhinobatos cemiculus, Gymnura altevela, Dasyatis pastinaca, Rhinoptera marginata, Pteromylaeus bovinus, Torpedo nobiliana, Raja miraletus and Raja clavata captured by gillnet, longline and bottom trawl fishing between May 2010 and July 2011 off the east coast of Iskenderun Bay, Turkey.Öğe Length-weight relationships for seven fish species from the southeastern Black Sea(Wiley, 2007) Demirhan, S. A.; Can, M. F.This study reports the parameters a and b of the length-weight relationships for seven fish species (Gobius niger, Mesogobius batrachocephalus, Mullus barbatus, Neogobius melanostomus, Raja clavata, Scorpaena porcus, Uranoscopus scaber) from the southeastern Black Sea.
