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Öğe A Comparison of Ageing Techniques to Improve Precision of Age Estimation from Fish Scales(Ege Univ, Fac Fisheries, 2005) Gursoy, Cigdem; Tarkan, Ali Serhan; Gaygusuz, Ozcan; Acipinar, HasanScales of rudd, Scardinius erythrophthalmus (L, 1758), prussian carp, Carassius gibelio ( Bloch, 1782) and roach, Rutilus rutilus (L., 1758) were sampled from two different habitats. Two methods of determining age from scales of fish were applied for all fish species. There was disagreement between methods. The agreement between the determinations of different age readers was better with the impressing scale method than cleaning scale method. Impressing method produced the best results in terms of precision of the age estimates besides it had many advantages such as quick - apply, storing data and easy back-calculation.Öğe Interannual variability of fecundity and egg size of an invasive cyprinid, Carassius gibelio(Taylor & Francis Inc, 2007) Tarkan, Ahmet Nuri; Gaygusuz, Ozcan; Tarkan, Ali Serhan; Gursoy, Cigdem; Acipinar, HasanA population of the invasive Prussian carp (Carassius gibelio) was examined over a three-year period in a mesotrophic reservoir to find out interannual variations of fecundity and egg size and the influence of maternal condition (total length, TL, and age class) and environmental factors (water temperature and fish density) on these variables. Prussian carp reproduction was synchronous, with only a single batch, and fecundity ranged from 1,250 to 62,400 eggs per female. Relative fecundities and egg size showed no significant between-year differences. Fecundity increased with age, whereas egg diameter remained unchanged with age and TL. Fecundity was affected positively by TL and negatively by fish density, whereas temperature had no significant effect. Egg size was not affected by fish density or temperature.Öğe Threatened fishes of the world(Springer, 2008) Tarkan, Ahmet Nuri; Tarkan, Ali Serhan; Bilge, Gokcen; Gaygusuz, Oezcan; Gursoy, Cigdem[Anstract Not Available]
