DIETARY ORGANIC MINERAL INFLUENCES THE GROWTH, FEED UTILIZATION AND VERTEBRAL MINERAL CONTENT OF WILD GOLDEN RABBITFISH, Siganus guttatus

Abstract

The positive effect of organic mineral as a dietary mineral source in aquafeed has been recently reported on several species. Nevertheless, the influence of organic minerals on rabbitfish has not yet been determined. The purpose of the present study was to evaluate the effects of different doses of organic mineral on growth and survival, and mineral content in vertebrae of golden rabbitfish, Siganus guttatus. Three diets were formulated containing 0.5%, 1.0%, and 2.0% organic material (OM). A control diet (OM0) did not contain OM. Instead, it was supplemented with an inorganic mineral mixture at a level of 1%. Three hundred fish were randomly selected and distributed in 12 cages to accommodate the four treatments with triplicates. The stocking density was 20 fish per cage. The initial body weight of fish used was 39.2 ± 0.3 g. Fish were fed the test diets twice a day for 150 days. A significant (P<0.05) cubic effect of the treatments was detected on all dependent parameters analysis, excluding feed intake. The influence of dietary OM was not significant for feed intake, indicating that dietary OM did not negatively affect the appetite of rabbitfish. Mineral (Ca, Mg, Zn) content in the vertebrae was significantly improved when dietary OM was included in the diet up to 1% but decreased at the highest inclusion level of 2%. The optimum level of dietary OM to gain the maximum growth rate of rabbitfish was 0.49% as the reflection of the breakpoint of two regressions fitted on specific growth rate (SGR). It is concluded that dietary OM level significantly affected the growth and vertebral mineral content of golden rabbitfish. The study increases our knowledge of the benefit of utilizing dietary OM in the fish diet.

Efeito da inclusão de Ceratophyllum demersum cru e fermentado na dieta sobre o desempenho de crescimento e digestibilidade em juvenis de carpa capim, Cte-nopharyngodon Idella Val.

“…On the other hand, the results noted that the FCR was higher in the fish fed on diets containing RH, and this was accompanied by a decrease in growth rates compared to the fish fed on the control (C). These results are in line with those of Laining and others (22) , who studied rabbitfish (Siganus guttatus) and confirmed that the amount of hornwort (Ceratophyllum sp.) in the diet increased the FCR value.…”

Use of Coontail as a natural phytoremediation feed additive for common carp

“…In another investigation, Catfish was found to have better growth performance when fed with 'Azolla' grown from wastewater, replacing up to 10 g kg -1 of fishmeal protein (Rahmah el.al 2022). In contrast, Laining et al (2016) reported rates parallelling those of the control group when using up to 30% of Ceratophyllum weed meal in the growth diets of rabbitfish. The amino acid content of the feed ingredients can be considered among the reasons for these growth differences.…”

“…3 Essential amino acids values of soybean meal, fish meal, and wheat meal were obtained from NRC (2011).4 Essential amino acids values of C. demersum meal were obtained fromLaining et al (2016). * CDM crude protein, crude lipid, crude fibre, ash, and dry matter values analysed in our study; SBM, FM, and WM values obtained from NRC (2011).…”

Partial Replacement of Fish Meal with an Aquatic Macrophyte, Ceratophyllum demersum in the Diet of Common Carp, Cyprinus carpio var. communis Fingerlings

“…These favorable impacts on development and feed efficiency in several fish species may be caused by the highest concentrations of essential amino acids and crude proteins found in the aquatic weeds [54,55]. Contrarily, it has been reported that using C. demersum weed meal up to 30% of the inclusion level in rabbit fish growth diets led to growth rates that were comparable to those of the control group [56]. Kiziloğlu et al [57] also noted a tendency for fish growth performance and feed utilization to decline when macrophyte content in diets increased.…”