The effects of varying dietary protein level on growth, feed conversion, body composition and apparent digestibility coefficient of juvenile mangrove red snapper,Lutjanus argentimaculatus(Forsskal 1775)

Abstract

The effects of several dietary protein levels on the growth, feed conversion, body composition and diet digestibility of juvenile Lutjanus argentimaculatus (body weight 12.3 g) were examined. Seven isolipidic (7.4%) diets were formulated to contain graded levels of protein (28–58%) with dietary energy ranging from 19.7 to 21.5 kJ g−1. Diets were distributed to triplicate groups of fish thrice a day at ration of 2% body weight for 90 days. Growth, feed conversion, protein utilization and digestibility of nutrients increased with increasing dietary protein level up to 43%, after which no significant improvement was observed. Digestibility of dry matter and energy showed a concomitant increase with the reduction in dietary wheat meal, attaining maximal values with high protein diets. No significant differences were detected in moisture, protein, lipid and ash content of whole fish or body organs as dietary protein increased. The mesenteric fat, hepato‐ and viscerosomatic indices decreased with increasing protein level. The cholesterol, triglycerides and haematocrit values were similar among treatments, except that high levels of plasma lipids were recorded above 43% protein diet. The use of a practical diet containing 43% protein is appropriate for the growth of L. argentimaculatus juveniles under the experimental conditions of the present study.

Impact of Different Salinity Levels on Growing Performance, Food Conversion and Meat Quality of Red Tilapia (Oreochromis sp.) Reared in Seawater Tanks

“…Evidence to support this is available in another study of Papotsoglou and Voutsinos (1988). Similar individual tendency has been reported in rainbow trout Salmo gairdneri (Papoutsoglou and Papaparaskeva-Papoutsoglou, 1979;Hile 1982;Papoutsoglou and Voutsinos, 1988), mangrove red snapper Lutjanus argentimaculatus (Abbas and Siddiqui, 2013) and redspotted grouper Epinephelus akaara (Kayano et al, 1993;Kang'ombe and Brown, 2008). In most of the above studies, great differences in plasma lipids and cholesterol levels were observed among groups for chemically different foods.…”

“…Siphoning of each tank was done after 1 h feeding to remove waste material from bottom and new water was added to maintain required water level. Finally, growth performance and food conversion of fish juveniles were calculated by using the following formulae (Abbas and Siddiqui, 2013;Daudpota et al, 2016):…”

Dietary Protein Level Affects the Growth Performance of Large Male Genetically Improved Farmed Tilapia, Oreochromis niloticus, Reared in Fertilized Freshwater Cages

“…High AST and ALT activities indicate a weakened or damaged liver function (Sandnes et al ). TG and TC are important biological lipids, and their levels in serum are useful indices of the status of lipid metabolism (Abbas and Siddiqui ; Jiang et al ). In our study, these indices did not differ significantly between fish fed different diets, suggesting that large tilapia remained in a relatively stable physiological state.…”

Growth performance and feeding utilization of alternative feed for adult horseshoe crabs Carcinoscorpius rotundicauda kept in captivity

“…Our study suggests that adult horseshoe crabs do not acquire as high protein as juveniles require to yield the optimal growth and to utilize the nutritional elements in the feed. Previously, many ranges of proteins were shown in many carnivorous animals such as lobsters (~50%; Glencross, Smith, Curnow, Smith, & Williams, ), fish red snapper (~43%; Abbas & Siddiqui, ) and mud crabs (40%–45%; Catacutan, ; Unnikrishnan & Paulraj, ). Insignificant body weight change in low level of protein Feed C‐fed horseshoe crabs from the other two alternative feeds (higher protein contents in Feed A and B) were unlike previous studies' findings.…”

“…consumption rate, body weight changes, and FR) and feeding utilization (i.e. AE, FCR and SGR) (Abbas & Siddiqui, 2013;Hu et al, 2018Hu et al, , 2014Hu et al, , 2011. Feeding Rate is the measure of the amount of feed needed by horseshoe crabs daily since it was rarely studied and unjustified.…”