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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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    Study on nutrition characteristics of Garra rufa on the River ASI
    (Parlar Scientific Publications, 2016) Demirci, Sevil; Yalçın Özdilek, Şükran; Simsek, Emrah
    In this study, 75 Garra rufa samples were examined to determine the feeding preference. These samples were collected from the tributaries of the Orontes River by using fyke nets, set nets, and electroshock method. G. rufa shows grazer type of nutritional characteristics. Basic nutritional regime was found to rely on phytoplanktons. When importance values of the nutrition sources of this species are analyzed, it is observed that Bacillariophyta is the fundamental group with an IRI (Index of Relative Importance) value of 6800.198. Especially the benthic forms of this family are important nutrient groups. Total nutrients are comprised of Bacillariophyta (65.15%), Cyanophyta (16.21%), and Euglenophyta (0.02%). Organisms of animal origin (Protozoa, Nematoda), although in a very small amount, are also among the nutrient groups of this species. © 2016 PSP.
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    Öğe
    STUDY ON NUTRITION CHARACTERISTICS OF GARRA RUFA ON THE RIVER ASI
    (Parlar Scientific Publications (P S P), 2016) Demirci, Sevil; Yalçın Özdilek, Şükran; Simsek, Emrah
    In this study, 75 Garra rufa samples were examined to determine the feeding preference. These samples were collected from the tributaries of the Orontes River by using fyke nets, set nets, and electroshock method. G. rufa shows grazer type of nutritional characteristics. Basic nutritional regime was found to rely on phytoplanktons. When importance values of the nutrition sources of this species are analyzed, it is observed that Bacillariophyta is the fundamental group with an IRI (Index of Relative Importance) value of 6800.198. Especially the benthic forms of this family are important nutrient groups. Total nutrients are comprised of Bacillariophyta (65.15%), Cyanophyta (16.21%), and Euglenophyta (0.02%). Organisms of animal origin (Protozoa, Nematoda), although in a very small amount, are also among the nutrient groups of this species.