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    Estimation growth parameters of endangered the fan mussel species (Pinna Nobilis L.) by using different growth models from Izmir Bay, Aegean Sea, Turkey
    (Parlar Scientific Publications, 2019) Demirci, Aydin; Acarli, Sefa
    The study was carried out at Karantina Island located on the west side of Izmir Bay, Aegean Sea, Turkey. The fan mussel spats were cultured on the single long line system. Shell length and total weight of spats were measured monthly from December 2004 to April 2006. In total, 590 the fan mussels were sampled, 466 of which were obtained from collectors and others were collected by diving. Age-related length and weight growth factors of the fan mussel evaluated with four different model. The RSS values of all estimates were highly reliable; length and age values were significantly higher than weight. Von Bertalanffy's growth parameters showed that the fan mussel has a slowly growing species. The maximum estimated length size obtained with bivalves was 78.58 cm, growth performance index or phi-SULPH WHVW (?) ZDV 3.33 IRU,]PLU Bay. According to this study also Richards and the Logic model can be found in older ages (>7 years) to be more appropriate. However, von Bertalanffy was more suitable for the older of fan mussel. As the age increases, growth decreases and even rest are expected, but the fan mussel individuals may have agerelated weight gain. © 2019 Parlar Scientific Publications. All rights reserved.
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    Öğe
    ESTIMATION GROWTH PARAMETERS OF ENDANGERED THE FAN MUSSEL SPECIES (PINNA NOBILIS L.) BY USING DIFFERENT GROWTH MODELS FROM IZMIR BAY, AEGEAN SEA, TURKEY
    (Parlar Scientific Publications (P S P), 2019) Demirci, Aydin; Acarli, Sefa
    The study was carried out at Karantina Island located on the west side of Izmir Bay, Aegean Sea, Turkey. The fan mussel spats were cultured on the single long line system. Shell length and total weight of spats were measured monthly from December 2004 to April 2006. In total, 590 the fan mussels were sampled, 466 of which were obtained from collectors and others were collected by diving. Age-related length and weight growth factors of the fan mussel evaluated with four different model. The RSS values of all estimates were highly reliable; length and age values were significantly higher than weight. Von Bertalanffy's growth parameters showed that the fan mussel has a slowly growing species. The maximum estimated length size obtained with bivalves was 78.58 cm, growth performance index or phi-prime test (phi') was 3.33 for Izmir Bay. According to this study also Richards and the Logic model can be found in older ages (>7 years) to be more appropriate. However, von Bertalanffy was more suitable for the older of fan mussel. As the age increases, growth decreases and even rest are expected, but the fan mussel individuals may have age related weight gain.
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    Öğe
    Reproduction of the narrow-clawed crayfish, Pontastacus leptodactylus (Eschscholtz, 1823) (Decapoda: Astacidea: Astacidae), in western Turkey
    (Oxford Univ Press, 2025) Berber, Selcuk; Kale, Semih; Acarli, Deniz; Demirci, Aydin
    Monthly collections using fyke nets between July 2020 and June 2021 (2,606 females, 3,864 males) in Atikhisar Reservoir, & Ccedil;anakkale, Turkey allowed us to investigate the reproduction of the narrow-clawed crayfish (Pontastacus leptodactylus ). The smallest female with visibly developed and quantifiable oocytes in the ovaries had a carapace length (CL) of 38.46 mm and a weight of 12.44 g among 568 individuals. The smallest male carrying spermatophores measured 25.06 mm in CL and weighed 18.96 g. Oocytes were observed from August to December, with enhanced development and darker colors noted from October to December. Density of female sexual maturity increased from October, reaching its peak in December. The length at first maturity (L50) for females and males was determined as 10.91 cm and 6.75 cm, respectively. Analysis of 493 pleopodal females revealed a mean of 145 fertilized eggs. The mean pleopodal egg weight was 1.47 g and ellipsoidal egg volumes varied 1.25-17.6 mm3. Samples from January 2021 exhibited the highest average egg number (190), whereas those from April 2021 had the largest mean egg size. Our results support the legal regulation of a minimum catch length of 10 cm for female crayfish in Turkey. Our research is the first comprehensive exploration of the reproductive characteristics of male and female narrow-clawed crayfish in Atikhisar Reservoir, providing valuable insights for decision-makers and fisheries managers to ensure stock sustainability. The findings furnish valuable insights for optimizing crayfish broodstock management within aquaculture systems.