Growth performance and hemobiochemical parameters in South African dusky kob (Argyrosomus japonicus, Sciaenidae) offered brewer’s yeast (Saccharomyces cerevisiae) as a feed additive

Madibana, M.J. and V. Mlambo

Single-cell proteins have potential to enhance feed utilization in fish. Madibana and Mlambo (2019) evaluated the effect of graded levels of dietary inactivated brewer's yeast, Saccharomyces cerevisiae, on the dusky kob, Argyrosomus japonicus, an emerging culture species. The maximum inclusion level of brewer's yeast that does not impair growth performance and health of dusky kob was determined to be 50 g/kg.

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Optimizing stocking density and microalgae ration improves the growth potential of tropical black-lip oyster, Saccostrea echinata, larvae

Nowland, S.J., W. A. O’Connor, and P. C. Southgate

While hatchery culture methods are well developed for a number of temperate oyster species, similar information is not available for many tropical oysters. A key bottleneck to the culture of the black-lip rock oyster, Saccostrea echinata, is the availability of spat. Nowland et al. (2019) conducted a series of experiments from which recommendations for key hatchery culture parameters for each major larval stage of the black-lip rock oyster were developed.

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Production of acute hepatopancreatic necrosis disease toxin is affected by addition of cell-free supernatant prepared from AI-2-producing Vibrio harveyi mutant

Pumkaew, M., S. Taengchaiyaphum, S. Powtongsook, W. Pungrasmi, and K. Sritunyalucksana

Acute hepatopancreatic necrosis disease results in serious shrimp mortalities through two virulent binary toxins produced by a specific strain of Vibrio parahaemolyticus (VPAHPND). Quorum sensing (QS) is known to regulate toxin production, perhaps through involvement of the AI-2 molecule. Pumkaew et al. (2019) showed that furanone inhibited AI-2 activity and reduced toxin production, suggesting potential avenues for management of VPAHPND infection.

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Apparent digestibility and protein quality evaluation of selected feed ingredients in Seriola dumerili.

Tomás-Vidal, A., R. Monge-Ortiz, M. Jover-Cerdá, and S. Martínez-Llorens

Continued advancements in aquaculture of marine species depend upon development of cost-effective feeds. Less-expensive alternatives to fishmeal are needed, but the suitability of feed ingredients depend largely on their respective digestibility. Tomás-Vidal (2019) assessed and report the apparent nutrient digestibility and protein quality of 12 different commercially available ingredients for the Mediterranean yellowtail, Seriola dumerili.

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