Effect of bioreactor-grown biomass from Ganoderma lucidum mycelium on growth performance and physiological response of red hybrid tilapia (Oreochromis sp.) for sustainable aquaculture

Autor: Janathu Ferdus Pajaru Rahman, Norhidayah Mohd Taufek, Grema Yerima, Wan Abd Al Qadr Imad Wan-Mohtar, Jaganath P. Thiran, Kumeera Subramaniam, Vikineswary Sabaratnam
Rok vydání: 2020
Předmět:
Zdroj: Organic Agriculture. 11:327-335
ISSN: 1879-4246
1879-4238
DOI: 10.1007/s13165-020-00303-5
Popis: Mushroom mycelial biomass is an alternative to unsustainable use of cash crops as feed in aquaculture systems. Lately, fish-feed mixtures enhanced with heterotrophic 1-m2-bioreactor-grown biomass from the mycelium of Ganoderma lucidum (MGL) were fed to red hybrid tilapia Oreochromis sp. (tilapia). MGL biomass had high protein (32.2%), carbohydrate (48.4%) and fibre (13.8%) content compared with other common fish-feed sources (fishmeal, soybean meal, rice bran and corn). Four experimental diets containing 0 (control), 5, 10 and 15 g/kg of MGL biomass respectively were randomly allocated to eight, 70-L tanks at 15 fish per tank with duplicate treatments. All diets were formulated to be isoenergetic (~ 19 kJ/g), and the fish were fed twice per day at 3% of their body weight ratio during the feeding trial, which lasted for 42 days. The utilization of 15 g/kg of MGL in the feeding trial resulted in 100% survival rate (SR), longer body length (> 1.7 cm) and higher (35 g) body weight gain (BWG) among tilapia compared with control (30 g) after 6 weeks. Surprisingly, the feed conversion ratio (FCR) of tilapia fed with 15 g/kg (1.13) treatment was significantly lower compared with control (1.98), indicating better quality feed. The specific growth rate (SGR) of tilapia at 15 g/kg MGL (2.14) indicated a significantly greater growth compared with control (1.28). Internally, the condition factor (CF: 1.85), hepatosomatic index (HSI: 2.47) and visceral somatic index (VSI: 11.06) yielded the most significant organosomatic indices for treated tilapia compared with control, resulting in superior yield and fish health. Blood analysis of MGL-treated tilapia showed that haemoglobin (HGB: 6.43 g/dl), packed cell volume (PCV: 35%), red blood cells (RBC: 2.47 × 106 mm3) and white blood cells (WBC: 1.64.3 × 105 mm3) were significantly increased (P
Databáze: OpenAIRE
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