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Use of 'Kluai Leb Mu Nang' banana peel as a dietary ingredient in feed for spotted scat (Scatophagus argus linnaeus, 1766)
(2018-01-01)
Yangthong, Monsuang
;
Hutadilok-Towatana, Nongporn
;
Ruensirikul, Jirayuth
The use of banana peel as an aquatic animal feed additive has been previously demonstrated. The peel of 'Kluai Leb Mu Nang' banana is known to be rich in useful nutrients and this study investigates its use as a dietary ingredient in the culture of spotted scat (Scatophagus argus). Five isonitrogenous and isocaloric diets supplemented with the ripe banana peel were fed to the fish twice a day for 12 weeks. Diet 1, without banana peel, served as a control diet, whereas Diets 2, 3, 4 and 5 were experimental diets containing 5, 10, 15 and 20 % banana peel respectively. The effects of the diets were measured in terms of the final body weight (FBW), weight gain (WG), specific growth rate (SGR), feed conversion ratio (FCR), protein efficiency ratio (PER), hapatosomatic index (HSI) and survival rate (SR) of the fish, as well as the influence on the fish whole-body composition (i.e. moisture, crude protein, crude lipid and ash percentages). At the end of the feeding period, the FBW, WG, SGR, FCR and PER of the fish fed diets containing 0, 5, 10 and 15 % banana peel were similar but those fed 20 % banana peel diet gained significantly less weight. Diets supplementated with banana peel had no effect on HSI, SR, body moisture or the crude protein content of the fish compared to control groups. Those fed 5 % peel diet had significantly higher ash content and the crude lipid content was significantly lower in the fish receiving the 15 % peel diet (all differences were significant at p<0.05). However, in general the levels did not deviate markedly from those obtained from the fish fed the control diet. Based on these results and the fact that the banana peel is an otherwise valueless biomass waste which is easily available, it may be of benefit as a feed additive in aquaculture.
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An aqueous extract from Sargassum sp. enhances the immune response and resistance against Streptococcus iniae in the Asian sea bass (Lates calcarifer Bloch)
(2016-12-01)
Yangthong, Monsuang
;
Hutadilok-Towatana, Nongporn
;
Thawonsuwan, Jumroensri
;
Phromkunthong, Wutiporn
The effects of the hot water extract from Sargassum sp. on the growth performance, immune responses, oxidative stress, and resistance of Asian sea bass (Lates calcarifer) to Streptococcus iniae were investigated. Four groups of fish were fed on the basal diet containing the extract at 0, 0.5, 1.0, and 2.0 g kg−1 diet for 30 days. Thereafter, the fish from each group were divided into equal halves. The first half was injected intraperitoneally with 0.85 % NaCl, and the second half was injected with S. iniae (2 × 103 cfu fish−1). At the end of the 30 days feeding trial, there were no significant differences in final body weight, weight gain, feed conversion ratio, and hepatosomatic index among four groups. Plasma protein, total immunoglobulin (Ig), and lysozyme messenger RNA (mRNA) levels in fish fed on diets containing 1.0 and 2.0 g kg−1 of Sargassum sp. extract, however, became increased in a non-dose-dependent manner. When fish were exposed to the bacteria, at 24 h, there were significantly (p < 0.05) higher levels of hematocrit, red blood cell and white blood cell, Ig, and serum lysozyme in fish fed on diet containing 2.0 g kg−1 of Sargassum sp. extract than those of the fish fed the control diet, and the highest survival rate was also observed in this group. In addition, fish receiving the seaweed extract were able to suppress lipid peroxidation especially at 24-h post S. iniae challenge. These findings thus suggested that Sargassum sp. extract can be used as an immunostimulant in Asian sea bass.

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