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    Biological parameters and current status of European eel (Anguilla anguilla Linnaeus, 1758) from Asi River, Northeastern Mediterranean region, Turkey
    (Wiley, 2020) Demirci, Sevil; Akar, Ozkan; Simsek, Emrah; Demirci, Aydin; Yalcin Ozdilek, Sukran
    The biological characteristics of eels from the Asi River, Turkey, were assessed between December 2017 and November 2018. Eels were sampled monthly using fyke nets (operated by professional fishermen), yielding a total of 509 specimens. Total length and weight were measured, sex, age and maturity stages (silver or yellow eel) were determined. Catch Per Unit Effort (CPUE) was calculated for both biomass per unit effort and numbers caught on a monthly and annual basis. The length-weight relationships (LWRs) of silver and yellow eel was W = 0.009*TL3.22 (n = 262) and W = 0.0106*L-3.09 (n = 247), respectively. The age of the sampled fish ranged from year class II to VI. Von Bertalanffy growth parameters were estimated as L-infinity=69.25 cm, K = 0.43 1/year, t(0)= -0.41 and phi prime index ()= 3.31 for all samples. The overall eel fishing mortality rate (F) was 0.31 year(-1), and the exploitation and survival rates of silver stage eels were estimated with 30% and 39%, respectively.
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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.