Dietary supplemental effects of red seaweedEucheuma denticulatumon growth performance, carcass composition and blood chemistry of juvenile Japanese flounder,Paralichthys olivaceus

Abstract

A 56-day feeding trial was conducted to determine the effects of supplementing diets of juvenile Japanese flounder, Paralichthys olivaceus, with Eucheuma denticulatum (EDP). Isonitrogenous and isolipidic test diets were prepared using a fishmealbased positive control diet (PC) and a fishmeal-soy protein concentrate negative control diet (NC) supplemented with 3 (D3%), 6 (D6%) and 9% (D9%) EDP. The test diets were assigned to tanks (12 fish tank À1 , initial mean body weight of 0.42 AE 0.01 g) in triplicates. Results of the feeding trial indicated that growth rates and feed efficiency significantly improved (P < 0.05) when 3% EDP was supplemented in the diets. However, there was a significant reduction (P < 0.05) of growth and feed efficiency in fish fed diets with higher supplementation levels. Protein, lipid, dry matter and ash contents of carcass and their corresponding nutrient retention values were not markedly altered in all dietary treatments. Fish fed diets supplemented with EDP exhibited higher (P < 0.05) omega-3 polyunsaturated fatty acid accumulation in dorsal muscle when compared with those of fish fed NC. Blood chemical parameters showed significant differences (P < 0.05) in total cholesterol and triglyceride levels. These results suggest that EDP can be efficiently utilized by Japanese flounder and can promote best growth and feed utilization at a level of 3%.

Effect of different dietary levels of Gracilaria lemaneiformis dry power on growth performance, hematological parameters and intestinal structure of juvenile Pacific white shrimp ( Litopenaeus vannamei )

“…Xu et al (2011) had found similar results when 3% dried G.lemaneiformis added in diets for teleost fish Siganus canaliculatus Ragaza et al (2013). also got the similar result that dietary supplemental of seaweed Eucheuma denticulatum did not alter carcass composition of Japanese flounder, Paralichthys olivaceus.…”

Dietary Spirulina (Arthrospira platensis) replacement enhances performance of juvenile Nile tilapia (Oreochromis niloticus)

“…Relative data (0-100 %) were arc-sine transformed before testing (Ragaza et al 2015). Data were subjected to one-way analysis of variance (Microsoft Excel 2013).…”

“…Powdered Arthrospira was sifted through a 1-mm wire mesh for a fine and uniform consistency. All of the ingredients were mixed and pelleted to approximate size (1.2-1.5 mm) and oven-dried at 120°C for 20 min (Ragaza et al 2015). Dried and cooled diets were then placed at −25°C until used.…”

“…Feeding was conducted twice daily at 0900 and 1500 hours, hand-fed to apparent satiety. Feces were siphoned from each tank before the morning feeding (Ragaza et al 2015). The recirculating aquaculture system was designed to continuously pump freshwater from a main reserve tank to designated experimental tanks.…”

The quest for indigenous aquafeed ingredients: a review

“…Seaweeds contain a significant amount of essential fatty acids (FA), particularly n-3 fatty acids ), a balanced amino acid profile, bioactive compounds, nonstarch polysaccharides, vitamins and minerals (Vinoj Kumar & Kaladharan 2007). This nutritional quality, coupled with its easy cultivation, adaptability to extreme conditions and low cost (Ragaza et al 2013), presents a high potential as dietary ingredient in aquaculture feeds. Widely assessed and used seaweeds in fish and shrimp diets include Ulva (Wassef 2005;Erg€ un et al 2009), Porphyra (Mustafa et al 1995), Macro, Kappaphycus and Gracilaria (Dy Peñaflorida & Golez 1996), among others.…”