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Nursery performance of Pacific white shrimp ( Litopenaeus vannamei Boone, 1931) cultivated in a biofloc system: the effect of adding different carbon sources
Author(s) -
Khanjani Mohammad Hossein,
Sajjadi Mir Masoud,
Alizadeh Morteza,
Sourinejad Iman
Publication year - 2017
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12985
Subject(s) - litopenaeus , shrimp , zoology , biology , starch , feed conversion ratio , salinity , food science , body weight , fishery , ecology , endocrinology
Effect of different carbon sources on nursery performance of Pacific white shrimp ( Litopenaeus vannamei ) cultivated in biofloc system was investigated. Shrimp postlarvae (98.47 ± 8.6 mg) were fed for 32 days in tanks with water volume of 130 L and density of 1 individual L −1 . One control treatment and four biofloc treatments ( BFT 1, BFT 2, BFT 3 and BFT 4) with adding different carbon sources including molasses, starch, wheat flour and mixture of them, respectively, were considered at equal weight ratios. According to the results, salinity, dissolved oxygen and pH were not significantly different among the biofloc treatments ( P > 0.05). Maximum pH (8.27) and maximum dissolved oxygen (6.35 mg L −1 ) were recorded in the control. Maximum (0.43 mg L −1 ) and minimum (0.09 mg L −1 ) ammonia were recorded in the control and BFT 2, respectively ( P < 0.05). Using simple carbohydrates (molasses and starch) lowered the ammonia concentration significantly. The highest increase in body weight (1640.43 ± 231.28 mg), growth rate, specific growth rate (8.97 ± 0.42% per day) and biomass (190.29 ± 26.83 mg) were found in BFT 1 and the highest survival (90 ± 0.77%) was found in BFT 4. The highest feed conversion (1.52 ± 0.23) and the lowest feed efficiency (66.81 ± 7.95) were observed in the control ( P < 0.05). The proximate composition analysis revealed an increase in lipid and ash in biofloc treatments. Results indicated that using biofloc technology with zero‐water exchange system and adding carbon sources could help to recycle waste and improve the water quality. Moreover, the type of carbonaceous organic matter as a substrate for heterotrophic bacteria would be effective in degradation and metabolization of ammonia and nitrite.