Journal article
Effects of dietary grape seed extract, green tea extract, peanut extract and vitamin C supplementation on metabolism and survival of greenlip abalone (Haliotis laevigata Donovan) cultured at high temperature
Aquaculture, Vol.464, pp.364-373
2016
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Abstract
<p>A major problem confronting the abalone farming industry in Australia is elevated mortality during summer months. Recent research suggests that temperature-induced tissue breakdown allows bacteria entry to the host, and nutritional supplementation can alleviate this breakdown. The aim of this study was to alleviate mortality of greenlip abalone, <em>Haliotis laevigata</em>, cultured at high summer water temperatures (25 °C) by dietary intervention using graded levels of peanut skin extract (PE; 0.5, 1.0, 2.5 and 5%), green tea extract (GTE; 0.5, 1.0, 2.5 and 5%) and vitamin C (1.0% vitamin C; 1.0% vitamin C + 1.0% GTE; and 1.0% vitamin C + 1.0% PE) in a commercial diet; these supplements contain antioxidant and bioactive compounds. The commercial diet containing 5.0% Australian grapeseed extract (GSE) fed at 25 °C was also included as a negative temperature/positive diet control due to improved survival and health of abalone at high temperatures in our previous study. Three-year-old abalone (49.21 g; 70.26 mm) were fed the commercial diet at 22 °C (positive temperature control), and the commercial diet (negative temperature control) and test diets at 25 °C for 38 days. Abalone survival was 85% for the commercial diet at 22 °C, whereas survival of abalone was significantly reduced to 40% when fed the commercial diet at 25 °C. There were no significant differences in survival of abalone fed the commercial diet at 22 °C and those fed 5.0% GSE, 0.5% GTE and 2.5% GTE diets at 25 °C. Supplements did not significantly affect oxygen consumption, ammonia excretion rates and total hemocyte count. Abalone fed 5.0% GTE had significantly lower phagocytic activity than those fed the commercial control diet at 22 °C. Supplementation with PE and vitamin C had no beneficial effects on survival, while GTE holds promise as a potential dietary additive to enhance the survival of abalone at higher water temperature. This study confirms that supplementation of 5.0% GSE in the commercial diet also improves the survival of greenlip abalone cultured at high summer water temperature in the laboratory setting.</p>
<p>Statement of relevance: Purported to have diverse health benefits including antioxidant, antimicrobial, anti-in- flammatory, and anticarcinogenic properties, 5% Australian grape extract, graded levels of green tea extract, peanut skin extract and vitamin C were supplemented in a commercial abalone diet in order to improve survival of greenlip abalone at high water temperature. <h4 id="x-x-x-absSec_2"> </h4></p>
Details
- Title
- Effects of dietary grape seed extract, green tea extract, peanut extract and vitamin C supplementation on metabolism and survival of greenlip abalone (Haliotis laevigata Donovan) cultured at high temperature
- Creators
- Duong N Duong - Flinders UniversityJian G Qin - Flinders UniversityJames O Harris - Flinders UniversityThanh H Hoang - Flinders UniversityMatthew S Bansemer - Flinders UniversityKrishna-Lee Currie - Flinders UniversityKim-Yen Phan-Thien - The University of SydneyAshley Dowell - Southern Cross UniversityDavid AJ Stone - Flinders University
- Publication Details
- Aquaculture, Vol.464, pp.364-373
- Identifiers
- 1882; 991012820791702368
- Academic Unit
- Southern Cross Plant Science
- Resource Type
- Journal article