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  • [ X ]
    Öğe
    A Study on Recent Variations in the Population Structure of European Anchovy (Engraulis encrasicolus L., 1758) in the Southern Black Sea
    (Ege Univ, Fac Fisheries, 2006) Samsun, Osman; Samsun, Necati; Kalayci, Ferhat; Bilgin, Sabri
    This research was carried out to estimate variation of stock structure anchovy (Engraulis encrasicolus, L. 1758) (N=7487) of the in Sinop Turkish coast in the southern of the Black Sea between 2000 and 2003. The mean sex ratio was 59 % (female): 41 % (male). The b constant of weight-length relationships were 2.7101, 3.0568, 2.8946 and 2.8695 for 2000-2001, 2001-2002, 2002-2003, and 2000-2003 fishing seasons, respectively. The result showed that fish were 0-3 years old. The von Bertalanffy growth parameter value of L-infinity (cm) were 16.84 cm, 18.46 cm, 18.73 cm and 18.91 cm for fishing seasons, respectively. Total (Z), natural (M), fishing (F) mortality rates and exploitation rate (E) were Z=2.07 year(-1), M=0.30 year(-1), F=1.77 year(-1), E=0.86, respectively for overall samples.
  • [ X ]
    Öğe
    Estimation of population parameters of anchovy, Engraulis encrasicolus L. 1758, at 2004-2005 fishing season in The Middle Black Sea, using length frequency analysis methods
    (Ege Univ, Fac Fisheries, 2006) Bilgin, Sabri; Samsun, Necati; Samsun, Osman; Kalayci, Ferhat
    This investigation was carried out to determine age, growth and mortality of 1245 anchovy, Engraulis encrasicolus L. 1758, in the Black Sea between November 2004 and May 2005. Growth parameters were estimated after determining the chorts by the Bhattacharya method. 0-3 ages groups with mean lengths of 7.90 +/- 0.05, 9.91 +/- 0.04, 11.66 +/- 0.02 and 13.86 +/- 0.03 cm were obtained. The sex ratio was 57% females and 43% males in the stock. The determined minimum and maximum length were 6.5 cm and 15.2 cm, weight were 0.98 g and 20.8 g, respectively. Condition factor, length-weight and age-length relationship for overal, female and male were CF = 0.616 +/- 0.002, CF = 0.612 +/- 0.003, CF = 0.624 +/- 0.003, W= 0.0066L(2.9669) (r=0.96), W=0.0119L(2.7266) (r=0.93), W= 0.0061L(3.0071) (r=0.96), Lt=21.17[1(-e-0.196(t+2.314))], Lt=20.42[1-e(-0.187(t+2.287))] and Lt=20.09[1-e(-0.191(t+2.419))], respectively. Length-weight and condition factors in male and female were statisticaly significant (p<0.05). Total (Z), natural (M) and fishing (F) mortality rate were Z=1.85 year(-1), M = 0.34 year(-1) and F = 1.51 year(-1), respectively. The exploitation rates (E) of 0.82 indicate that the population was being heavily exploited.