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    An investigation of the reproductive properties of crayfish (Pontastacus leptodactylus (Eschscholtz, 1823) in Kocahidir reservoir
    (Parlar Scientific Publications, 2020) Boyalik, Fatih; Berber, Selcuk
    This study was carried out to investigate the relationships between some morphological and reproductive features of the Turkish crayfish, P. leptodactylus, collected from a controlled irrigation lake in the Kocahidir reservoir (Canakkale, Turkey), between July 2015 and June 2016. The sizes at sexual maturity were determined for both female and male individuals in the Kocahidir Irrigation Pond. For female crayfish, the total length of the smallest individual with mature egg ovaries was 83.54 mm and it weighed 15.5 g while the smallest individual that had fertilized eggs in the pleopods had a total length 91.89 mm weighed 23.78 g. The mean number of eggs detected in the female pereiopod was 192 ± 16, average egg diameter was 2.75 ± 0.013 mm, and the average egg weight was 0.012 ± 0.001 g. This study, explored the sexual differences and similarities in freshwater crayfish and their status in the Kocahidir Irrigation Pond was evaluated according to the populations at different localities. As a result, the-required strategies for their protection and to ensure a sustainable future for the freshwater crayfish population have been highlighted. © by PSP
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    AN INVESTIGATION OF THE REPRODUCTIVE PROPERTIES OF CRAYFISH (PONTASTACUS LEPTODACTYLUS (ESCHSCHOLTZ, 1823) IN KOCAHIDIR RESERVOIR
    (Parlar Scientific Publications (P S P), 2020) Boyalik, Fatih; Berber, Selcuk
    This study was carried out to investigate the relationships between some morphological and reproductive features of the Turkish crayfish, P. leptodactylus, collected from a controlled irrigation lake in the Kocahidir reservoir (Canakkale. Turkey), between July 2015 and June 2016. The sizes at sexual maturity were determined for both female and male individuals in the Kocahidir Irrigation Pond. For female crayfish, the total length of the smallest individual with mature egg ovaries was 83,54 mm and it weighed 15.5 g while the smallest individual that had fertilized eggs in the pleopods had a total length 91.89 mm weighed 23.78 g. The mean number of eggs detected in the female pereiopod as 192 +/- 16, average egg diameter was 2.75 +/- 0.013 mm, and the average egg weight was 0.012 +/- 0.001 g. This study, explored the sexual differences and similarities in freshwater crayfish and their status in the Kocahidir Irrigation Pond was evaluated according to the populations at different localities. As a result, the required strategies for their protection and to ensure a sustainable future for the freshwater crayfish population have been highlighted.
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    Meat Yield and the Length-Weight Relationships of the Narrow-Clawed Crayfish, Pontastacus leptodactylus (Eschscholtz, 1823)
    (Mekelle Univ, Coll Natural & Computational Sciences, 2023) Boyalik, Fatih; Berber, Selcuk; Kale, Semih
    The present study investigated the length-weight relationships and meat yield of narrow-clawed crayfish, Pontastacus leptodactylus (Eschscholtz, 1823), in Kocahidir Irrigation Reservoir. Between July 2015 and June 2016, a total of 653 individuals (255 females and 398 males) were sampled, and their carapace lengths (CL), total lengths (TL), and total weights (TW) were measured. The female-to-male ratio for the entire population was found to be 0.64:1.00. The results showed that the CL of the narrow-clawed crayfish ranged between 37 and 90 mm (3979 mm for females and 37-90 mm for males), while the TW ranged from 10.10 to 165.61 g (11.13-90.01 g for females and 10.16-165.61 g for males). The TL of female individuals was 114.09 mm, with a weight of 40.43 g, while the TL of male individuals was 116.32 mm, with a weight of 53.45 g. The ratio of individuals above the minimum legal-size limit of 100 mm was determined to be 80.70% for the crayfish population in Kocahidir Irrigation Reservoir. Regression analysis indicated that the TL-TW and CL-TW relationships for female narrow clawed crayfish exhibited negative allometric growth, while males showed positive allometric growth in terms of the TL-TW relationship and isometric growth in terms of the CL-TW relationship. Isometric growth was observed in the whole population for both male and female individuals in terms of TL-TW and CL-TW characteristics. Female individuals with carapace lengths ranging from 43-82 mm had a chelae meat yield of 2.48%, an abdomen meat yield of 11.38%, and a total meat yield of 13.85%. Male narrow-clawed crayfish with carapace lengths ranging from 35 to 90 mm had a chelae shear meat yield of 4.13%, an abdomen meat yield of 10.52%, and a total meat yield of 14.64%.