Interactions of season, sex and size on nutrient composition of freshwater crayfish (Astacus leptodactylus Eschscholtz, 1823) from Lake Eğirdir

Abstract

Astacus leptodactylus is naturally and widely distributed in lakes, ponds and rivers throughout Turkey (Harlioğlu & Harlioğlu, 2004). On recent years, there has been a gradual decrease in the production of crayfish in Turkey from 5000 tons in 1984 to 532 tons in 2015 (Turkish Statistical Onstitute, 2017). The greatest cause of this decline is crayfish plague fungus (Aphanomyces astaci) seen after 1985 (Baran et al., 1987; Rahe & Soylu, 1989; Harlioğlu, 2008). There is no crayfish culture in Turkey and all production is obtained from wild harvests (Harlioğlu et al., 2012). Therefore, culture of crayfish is needed to replenish native stocks of A. leptodactylus. Feeding habits of A. leptodactylus compose bivalves (Dreissena polymorpha), gastropods (Greacoanatolica lacustristurca), crayfish eggs (Acar Kurt, 2016), Nematoda (Capillaria sp.) and sometimes fish Aphanius anatoliae, aquatic plant Ceratophyllum demersum,

Monthly variation of fatty acids, lipid quality index and metal content of Pontastacus leptodactylus (Eschscholtz, 1823) in Atikhisar Dam Lake (Çanakkale, Türkiye)

“…Overall, males had higher lipid content than females, except in September. Some studies have reported the opposite for crayfish, where females were found to have higher total lipid content (Bahadır Koca and Argun Uzunmehmetoğlu 2018 ). However, Mona et al ( 2000 ) found higher fat levels in male individuals and attributed this to the demand for these materials during the active metabolic processes required for the rapid completion of their life cycle.…”

“…In the context of crustacean biochemistry, it has been observed that factors such as sex, reproductive period (Buckup et al 2008 ), environmental parameters like habitat, feeding activity, and food availability (Buckup et al 2008 ), as well as seasonality (Bahadır Koca and Argun Uzunmehmetoğlu 2018 ), can influence their metabolism and biochemical composition. Lipids, as the main organic reserve in many crustaceans, play a significant role in the metabolic processes of these species.…”

Effectiveness of chitosan/propolis extract emulsion coating on refrigerated storage quality of crayfish meat (Astacus leptodactylus)

“…However, it is susceptible to spoilage just like fish and other seafood and should be consumed fresh immediately after harvest, or measures should be taken to preserve its original freshness as much as possible. Therefore, adequate packaging technologies need to be developed for the preservation of fish or other foods (Bahadır Koca & Argun Uzunmehmetoğlu, 2018;Ojagh et al, 2010).…”