Aquaculture America 2024

February 18 - 21, 2024

San Antonio, Texas

COMPARISON AND EFFICACY OF SOY-BASED INGREDIENTS IN PRACTICAL DIETS FOR FLORIDA POMPANO Trachinotus carolinus

 

Trenton Corby*, Trinh Ngo, Khanh Nguyen, Adela Araujo, Leila Strebel, Stephanie Velasquez, Melanie Rhodes, Timothy J. Bruce,  and D. Allen Davis

School of Fisheries, Aquaculture, and Aquatic Sciences

Auburn University

Auburn, AL 36849

tlc0059@auburn.edu



 Three trials  were performed to better understand how soy processed in different ways impacts the  growth, feed conversion ratio, and health of the Florida pompano (Trachinotus carolinus). First t wo growout trials were performed to evaluate the efficacy of an open soy-based diet in comparison to a commercially produced, fishmeal-based diet. Trial one utilized 6 replicate s and  was terminated after 42 days of growout. Overall biomass (p=0.026), weight gain (p=0.006), and FCR (p =0.015) being significantly different between both treatments, with r esults showing overall preference for commercially produced fishmeal  diet  over  the soy-based diet.  The second trial  was run over the course of 56 days, and upon termination there were no statistically significant differences  due to diets.  Histological samples  taken upon termination  of distal intestine  showed no statistical differences in symptoms  indicative of soy -induced enteritis (lamina propria thickness, goblet cell frequency, central stroma widening, and vacuolization) between the practical soy diet or the commercial fishmeal diet.  To improve soy-based feed formulations we  evaluated soy-based ingredients processed  under different conditions. Nine experimental diets with varying soy sources  were  formulated in combination with 14% poultry by product meal  and 6% corn protein concentrate and designed to be iso-nitrogenous and isolipidic at 40% protein and 8% lipid. A basal  diet comprised of  49.97%  solvent extracted soybean meal (SBM) was compared with diets containing low oligosaccharide soybean meal (SBM-LO), soy protein concentrate (SPC), fermented soybean meal (Fer-SBM), and  expeller extruded soybean meal (EE-SBM) at varying levels of replacement of solvent extracted soybean meal. J uvenile Florida pompano (4.82 ± 0.08 grams) were offered randomly assigned diets  in quadruplicate for 76 days. Upon termination, there were no significant differences in weight (p=0.493), survival (p=0.925), or FCR (p=0.874) in fish offered any of the experimental diets. Histological analysis  of distal intestine samples showed no statistical differences  in lamina propria thickness, goblet cell frequency,  or vacuolization, however there was  significant differences in lamina propria thickness between samples offered SPC at 100% replacement and Fer-SBM at 50% replacement. Based on the current study, it can be inferred that Florida pompano offered a soy-based diet show no adverse effects in terms of growth or health when compared to a diet primarily composed of fishmeal . Despite no significant differences between soy sources , fish offered EE-SBM at 25% replacement performed best , having the highest  overall weight and percent weight gain as well as having the lowest feed conversion rate.