We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Dietary Protein Requirement of Juvenile Dotted Gizzard Shad Konosirus punctatus Based on the Variation of Fish Meal
Summary
Researchers conducted an 8-week feeding trial with juvenile dotted gizzard shad and found that dietary protein levels between 34–39% crude protein optimized growth, feed conversion, and nitrogen retention, providing practical guidance for sustainable aquaculture feed formulation for this species.
An 8-week feeding trial was conducted to investigate the effects of dietary protein levels on growth performance, feed utilization, and energy retention of juvenile dotted gizzard shad Konosirus punctatus based on the variation of fish meal. Fish meal was used as the sole protein source; five semi-purified diets were formulated with varying crude protein (CP) levels of 22.52%, 28.69%, 34.85%, 38.84%, 45.78% (CP1-CP5 diets). A total of 300 uniform juveniles with initial body weight 3.61 ± 0.20 g fish-1 were randomly divided into five groups with three replicates in each group. The results showed that different CP levels did not significantly affect the survival of juvenile K. punctatus (p > 0.05). The values of weight gain (WG) and specific growth ratio (SGR) showed a general enhancing trend and then weakened with increasing dietary CP levels (p > 0.05). Feed utilization also improved with increasing dietary CP levels (p > 0.05), and the optimal feed conversion ratio (FCR) value was found in fish fed the diet with CP3 (p > 0.05). The rise of dietary CP from 22.52% to 45.78% enhanced the daily feed intake (DFI) and protein efficiency ratio (PER) values of K. punctatus (p < 0.05). With the increase of dietary CP levels, daily nitrogen intake (DNI), energy retention (ER), and lipid retention (LR) elevated, while retention (NR), daily energy intake (DEI), and daily lipid intake (DLI) reduced (p < 0.05). No statistical differences in the content of water, crude protein, and crude lipid were observed among different treatments (p > 0.05). The activity of lipase in CP3 and CP4 diets was significantly higher than that of the CP1 diet (p < 0.05). Fish fed CP2 and CP3 diets had significantly higher amylase activity than that of the CP5 diet (p < 0.05). The levels of alanine aminotransferase (GPT) first enhanced and then decreased as dietary CP levels raised. The second-order polynomial regression model analysis of the WG and FCR indicated that the optimal dietary protein level for K. punctatus is about 31.75-33.82% based on the variation of fish meal.
Sign in to start a discussion.
More Papers Like This
The Importance of Fatty Acid Precision Nutrition: Effects of Dietary Fatty Acid Composition on Growth, Hepatic Metabolite, and Intestinal Microbiota in Marine Teleost Trachinotus ovatus
Researchers fed pomfret juveniles three diets with different fatty acid compositions including fish oil, a custom blend oil, and a fish-soybean oil blend and found that the custom blend oil diet matched fish oil for growth while reducing liver inflammation, oxidative stress markers, and pathogenic gut bacteria, supporting precision lipid nutrition in marine aquaculture.
Reassessment of dietary protein and lipid requirements for large yellow croaker, Larimichthys crocea, reared in net pens
Not directly relevant to microplastics — this study optimises dietary protein and lipid levels for farming large yellow croaker fish in net pens.
Harvesting the benefits of nutritional research to address global challenges in the 21st century
Researchers reviewed progress in aquaculture nutrition over the past 20 years, highlighting improvements in feed conversion efficiency and the expanded use of diverse feed ingredients. The study identifies ongoing challenges including the need for better understanding of nutrient requirements across aquaculture species and the importance of addressing global food security through continued nutritional research.
Investigation of dependences of the morphological composition of body and amino acid composition of trout meat proteins (Oncorhynchus mykiss) on levels of the energy value of feeds
Researchers investigated how varying dietary energy levels affect the morphological composition and amino acid profile of rainbow trout muscle proteins over a 210-day feeding trial. The study found that energy nutrition level significantly influenced body composition ratios and the balance of essential and non-essential amino acids in trout meat.
Fish Meal Substitution Effects with the Combined Animal Proteins in the Feeds of Olive Flounder (Paralichthys olivaceus) on Growth Performance, Feed Availability, and Disease Resistance against Streptococcus iniae
Researchers tested progressive substitution of fish meal with combined meat and chicken by-product meal in olive flounder feeds, evaluating growth, feed conversion, and disease resistance. Up to 40% substitution maintained comparable performance to the control diet, while higher replacement levels reduced growth and weakened resistance to Streptococcus iniae infection.