Dietary addition of skipjack tuna broth as a gastric secretagogue enhances ex vivo gastric digestibility and growth of rockfish Sebastes schlegelii

Kihara Minoru, Sato Yui, Suzuki Tomohiro

doi:10.11233/aquaculturesci.71.163

This study investigated the effects of skipjack tuna broth (SJT-Br) as a gastric secretagogue on gastric digestion and growth in rockfish (Sebastes schlegelii). In the first experiment, isolated fish stomachs were infused with SJT-Br; 0.5% and 1% SJT-Br infusions resulted in a significant increase in pepsin-like protease (PLP) activity and secretion compared to control (no SJT-Br). In the second experiment, different concentrations of SJT-Br were added to boiled fish paste (BFP) diets; concentrations of 0.5% and 1% resulted in enhanced ex vivo gastric digestibility of BFP and higher PLP secretion. In the third experiment, juvenile rockfish were fed fish meal-based diets containing 0% (control), 1% or 10% SJT-Br, and a soybean meal-based diet containing 0% (control) or 1% SJT-Br. Fish fed SJT-Br-supplemented diets exhibited significantly higher body weights compared to the corresponding control diets. These results suggest that SJT-Br acts as a gastric secretagogue, enhancing gastric secretion and digestion in fish. Adding SJT-Br to diets has the potential to enhance growth performance in juvenile rockfish, possibly due to increased secretion of digestive enzymes facilitated by SJT-Br. These findings emphasize the potential of SJT-Br as a valuable component in aquaculture feeds, promoting efficient digestion and growth in fish species.

Dietary addition of skipjack tuna broth as a gastric secretagogue enhances <i>ex vivo</i> gastric digestibility and growth of rockfish <i>Sebastes schlegelii</i>

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