ABSTRACT
This study was carried out to determine some bioecological characteristics of Mastacembelus mastacembelus, which is the only species of Mastacembelidae family living in Turkey. Fish samples were caught between 2014-2018 from Keban Dam Lake, one of the most important reservoirs of the upper Euphrates Basin. In totally, 348 Mastacembelus mastacembelus individuals were examined, including 178 males and 170 females. The age distributions were defined between the I-XV age groups. Total lengths ranged from 14.20 to 81.80 cm in males and from 15.60 to 77.30 cm in females. Total length-weight relationships were calculated as W = 0.0083 × TL2.6516 for males, W = 0.0043 × TL2.8310 for females and W = 0.0063 × TL2.7256 for all population, and the growth type was estimated as "negative allometric". The von Bertalanffy growth parameters for all individuals were computed as L∞ = 90.99, k = 0.13, t0 = - 0.45. The total (Z), natural (M), fishing (F) mortality rates and exploitation rate (E) were estimated as Z = 0.313, M = 0.270, F = 0.043 and E = 0.137, respectively. The length at first capture (Lc) was found as 50.72. The optimum, maximum and economic yields were calculated as E0.5 = 0.361; Emax = 0.776; E0.1 = 0.664, respectively.
Subject(s)
Eels/anatomy & histology , Rivers , Animals , Eels/physiology , Female , Fisheries , Geography , Male , Population Dynamics , TurkeyABSTRACT
BACKGROUND: In this study the effects of the use of chia mucilage - CM coating in combination with propolis liquid extract - PLE on the physico-chemical (total volatile basic nitrogen - TVB-N, peroxide value - PV, thiobarbituric acid - TBA) and bacteriological (total viable count - TVC, psychrophilic bacteria count -PBC) quality properties of sea bass fillets during storage at 2°C, as well as its potency, were investigated. METHODS: The fillets were randomly separated into four lots and subjected to the following treatments by dipping: chia mucilage - CM, chia mucilage + 0.1% PLE, chia mucilage + 0.3% PLE and control (uncoated), then stored at 2°C. RESULTS: The results showed that the chia musilage coating containing PLE was effective on TVC and PCA. While the shelf life of the control group was 8 days, the CM + 0.3% PLE group was 20 days. CONCLUSIONS: According to these results, it can be said that chia mucilage coating preserves the shelf life and quality of chilled seafood and can be used safely as a coating material.
