African catfish (Clarias gariepinus) is one of the most important freshwater aquaculture species due to its adaptability, fast growth, and commercial value. However, its reproduction is naturally seasonal, creating challenges for year-round seed production. This study explored how dietary supplementation of tryptophan, an essential amino acid, could influence reproductive hormones and oocyte maturation in African catfish broodstock.
Researchers conducted controlled feeding experiments using three levels of tryptophan (0.33%, 0.41%, and 0.49%) and monitored hormone levels—melatonin, estradiol, and vitellogenin—along with egg and yolk diameters, oocyte size, and hatching rates over 30 days. The results showed that higher tryptophan supplementation (0.49%) significantly accelerated reproductive hormone production and oocyte development. By day 20, catfish fed with the enriched diet demonstrated higher melatonin (10.69 ng/mL), estradiol (1.90 ng/mL), vitellogenin (35.84 ng/mL), and larger oocytes (1.18 mm) compared to the control group. Egg and yolk diameters were also improved, and hatching rates increased to over 90%.
Interestingly, the effects were not strictly linear. The intermediate tryptophan dose (0.41%) showed inconsistent outcomes, with smaller egg and yolk diameters. This suggests that precise dosage is critical for optimizing reproductive benefits, as excessive or imbalanced supplementation may interfere with metabolic pathways and egg quality.
Overall, the study demonstrates that the right amount of dietary tryptophan can boost reproductive efficiency in African catfish, offering a sustainable solution for hatchery operations. This finding has broader implications for aquaculture productivity, food security, and the responsible use of feed resources. By ensuring reliable broodstock performance, the research supports SDG 2 (Zero Hunger) through aquaculture development, aligns with SDG 14 (Life Below Water) by promoting sustainable fishery practices, and reflects SDG 12 (Responsible Consumption and Production) through efficient feed utilization.
Credits
Meet the Researchers: This study was led by Epro Barades and colleagues from Universitas Padjadjaran and Politeknik Negeri Lampung, with support from Indonesia’s Ministry of Education and Ministry of Finance.
Hashtags
#UnpadResearch #CatfishAquaculture #SDG2 #ZeroHunger #AquacultureInnovation #FishReproduction #SustainableFisheries