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    Age, growth and reproduction of tub gurnard (Chelidonichthys lucerna L. 1758) in the Bay of Iskenderun in the eastern Mediterranean
    (Scientific Technical Research Council Turkey, 2004) Ismen, A; Ismen, P; Basusta, N
    The age composition, growth parameters, spawning season, sex ratio, length at first sexual maturity and fecundity of tub gurnard (Chelidonichthys lucerna) caught from the Bay of Iskenderun in the eastern Mediterranean Sea were investigated. Females and males made up 58.2% and 41.8%, respectively, of the particular population of the species. The total length of females ranged from 8.0 cm to 30.3 cm, and of males from 8.3 cm to 21.2 cm. The length (L) - weight (W) relationships for males and females were estimated as W = 0.0089*L-3 01 and W = 0.0095*L2-99, respectively. The age data derived from otolith readings were used to estimate the growth parameters of the von Bertalanffy equation. The estimated parameters were: Linfinity = 45.0 cm, K 0.221 and t(omicron), -0.581. The maximum age was 4 for females and 3 for males. The 1-year age group was dominant in both females and males. Males matured at a total length of 18 cm, while females matured at 20 cm. The monthly values of the gonadosomatic index indicated that spawning occurred mainly between December and May. The fecundity (F) - length relationship was logF = -2.512 + 5.58logL (r = 0. 94).
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    Nematode infection in the whiting Merlangius merlangus euxinus off Turkish Coast of the Black Sea
    (Elsevier, 1999) Ismen, A; Bingel, F
    The endoparasites of whiting, Merlangius merlangus euxinus from the Turkish Coast of the Black Sea were investigated during the years 1990-1993. Only the endoparasite, Hysterothylacium aduncum (Nematoda: Anisakidae) was recorded in all visceral organs examined. The prevalence and intensity of H. aduncum were significantly higher in the warm season (July-August) than in the colder period (January-February) (P<0.01). Infection increased significantly with age and length of the fish (P<0.01). The relationship between fecundity and length for infected and uninfected fish was calculated as log F=2.492 log L+1.531 and log F=2.611 log L+1.408, respectively. No significant difference between infected and uninfected fish was seen in either the fecundity-length data or the condition factor (P>0.01). (C) 1999 Elsevier Science B.V. All rights reserved.