Effect of Dietary Lipid Sources on Body Fatty Acid Composition of Chinese Longsnout Catfish Leiocassis longirostris

Abstract

We investigated the effects of dietary lipid sources on growth and fatty acid composition of juvenile Chinese longsnout catfish. Triplicate groups of fish (initial average weight, 3.8 g) were fed four diets containing either fish oil (FO), soybean oil (SO), linseed oil (LO) and lauric acid (LA) for 10 weeks. There were no differences among the groups in body weight, feed intake, feed efficiency, protein efficiency ratio, and body proximate composition of fish fed the diets containing different lipid sources (P > 0.05) during the study. However, fatty acids compositions of the whole body were influenced by dietary lipid source. Fish fed the SO diet had high concentration of linoleic acid, whereas those of fish fed the LO diet were rich in linolenic acid and arachidonic acid. Fish fed the FO diet had significantly (P < 0.05) higher levels of monounsaturated fatty acids such as 18:1n-9 and 20:1n-9 than those of fish fed the SO and LO diets. Eicosapentaenoic acid (EPA; 20:5n-3) and docosahexaenoic acid (DHA; 22:6n-3) composition of body were not influenced by dietary lipid source. The results suggest that each of FO, SO, LO or LA can be used as a lipid source in the diets of Chinese longsnout catfish without any negative effects on growth and feed utilization and these data demonstrate the potential impact which dietary fat composition can change the body fatty acid profile.

Total replacement of dietary fish oil with alternative lipid sources in a practical diet for mandarin fish, Siniperca scherzeri, juveniles

“…This could be due either to selective retention and/or active synthesis of these fatty acids (Turchini et al 2011b). Similar results were observed in other freshwater fish species such as rainbow trout (Caballero et al 2002;Turchini and Francis 2009), Murray cod (Turchini et al 2006), common carp (Ren et al 2012), tilapia (Al-Souti et al 2012, Li et al 2016, Chinese long snout catfish, Leiocassis longirostris Günther (Choi and Lee 2015), and silver barb, Puntius gonionotus (Nayak et al 2017). It is widely believed that freshwater fish can convert C 18 PUFA of both n-6 and n-3 series to their corresponding LC-PUFA via a series of desaturation and elongation reactions (NRC 2011;Turchini et al 2011b).…”

Effects of Five Lipid Sources on Growth, Hematological Parameters, Immunity and Muscle Quality in Juvenile Largemouth Bass (Micropterus salmoides)

“…Previous studies have found that the replacement of FO with vegetable oil leads to reduced EPA and DHA contents in the muscle of silver barb [ 43 ], beluga sturgeon [ 44 ] and glass carp [ 42 ]. Considering the variations in DHA and EPA contents in the dorsal muscle of largemouth bass in this study, this indicates that DHA and EPA could be retained in the muscle from diets [ 45 ]. And higher retention of DHA over EPA may be due to the selective utilization of EPA over DHA in order to fulfill the needs for membrane structure and performance [ 20 ].…”

Rice bran in the diet as an enriching source of long chain Omega (n-3) poly unsaturated fatty acids (LC n-3 PUFAs) in fillets of genetically improved farmed Tilapia (GIFT)

“…Fish oil is rich in n-3 series fatty acids, especially EPA and DHA. It is an important ingredient in aqua feed that provides highly digestible polyunsaturated fatty acids (Choi & Lee, 2015). Oily vegetable protein is also commonly used as an ingredient in aqua feed due to low cost or as an alternative supplement source for fish oil.…”