ANTARCTIC KRILL MEAL REPLACEMENT OF FISH MEAL ON GROWTH PERFORMANCE AND FECUNDITY OF FEMALE <i>MONOPTERUS ALBUS</i>

FU Peng; YUE Hua-Mei; RUAN Rui; YE Huan; LI Zhong; LI Chuang-Ju

doi:10.7541/2023.2022.0353

Volume 47 Issue 2

Jan. 2023

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ACTA HYDROBIOLOGICA SINICA > 2023 > 47(2): 249-256. > DOI: 10.7541/2023.2022.0353 CSTR: 32229.14.SSSWXB.2022.0353

FU Peng, YUE Hua-Mei, RUAN Rui, YE Huan, LI Zhong, LI Chuang-Ju. ANTARCTIC KRILL MEAL REPLACEMENT OF FISH MEAL ON GROWTH PERFORMANCE AND FECUNDITY OF FEMALE MONOPTERUS ALBUS[J]. ACTA HYDROBIOLOGICA SINICA, 2023, 47(2): 249-256. DOI: 10.7541/2023.2022.0353

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ANTARCTIC KRILL MEAL REPLACEMENT OF FISH MEAL ON GROWTH PERFORMANCE AND FECUNDITY OF FEMALE MONOPTERUS ALBUS

Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture and Rural Affairs of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China

Funds: Supported by the Central Public- interest Scientific Institution Basal Research Fund, Chinese Academy of Fishery Sciences (2020XT08)

Received Date: August 27, 2022
Rev Recd Date: October 08, 2022
Available Online: October 30, 2022
Published Date: February 14, 2023

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Abstract

Abstract

Swamp eel (Monopterus albus) is one of the most important cultured fresh water species with high economic value in China, however, the present compound diets could not meet the growth and gonad development of swamp eel broodstocks, which hampered the large-scaled aquaculture of this species, therefore, the reproduction improvement of swamp eels by optimization of the compound diet formulation is on the urgent need. Antarctic krill meal is rich in sustainable resources and has the same nutritional level as fish meal, which meets the requirements of a new type of animal protein source for feed. Reports showed that Antarctic krill meal inclusion improved the growth and reproduction of several aquatic animals. In this study, two-winter-age female Monopterus albus with an initial body weight of (36.41±3.62) g was adopted. Antarctic krill meal was included to replace 0, 20%, 40%, 60%, 80%, and 100% fish meal to make 6 groups of iso-nitrogenous and iso-energetic diets. After 12 weeks of culture, the growth performance, body composition, hepatic anti-oxidant capacity and non-specific immunity, and fecundity of six groups of experimental eels were determined. The results showed that the weight gain rate (WGR) and specific growth rate (SGR) of eels had no significant differences in 20% replacement group and the control group (P>0.05). However, the further increase of Antarctic krill meal substitution (>40%) led to the growth performance reduction. In muscle, crude protein concentration was higher in 20% substitution group than the other experimental groups; no significant differences were observed in the crude lipid and ash concentrations among different groups in muscle of swamp eels (P>0.05). In ovary, the nutrient composition had no significant difference between groups of 20% substitution group and the control group (P>0.05). Concentrations of crude protein and crude lipid decreased significantly while the moisture concentration increased gradually by Antarctic krill meal substitution from 60% to 100%. The further detection of the anti-oxidant capacity of liver revealed that superoxide dismutase (SOD) activity decreased gradually albeit with the increase of malondialdehyde (MDA) concentration in groups of Antarctic krill meal substitution higher than 40%. The catalase (CAT) activity in 100% substitution group was lower than the other five groups. The following non-specific immunity evaluation of liver suggested that no significant differences were observed between 20% substitution group and the control group in parameters of alkaline phosphatase (AKP), complement 4 (C4), and immunoglobulin M (IgM) (P>0.05). When the Antarctic krill meal substitution level were 60% or higher, the AKP activity showed the increased trend, while concentrations of C4 and IgM decreased instead. Lastly, fecundity of swamp eels in all groups were examined. The 20% Antarctic krill meal substitution did not influence fecundity parameters including gonadosomatic index (GSI), absolute fecundity, relative fecundity and serum estradiol concentration (P>0.05) in swamp eels. GSI in 80% and 100% groups were lower than that of 40% and 60% groups. From 60% to 100% substitution groups, the absolute fecundity, relative fecundity and estradiol concentrations decreased gradually with the increase of Antarctic krill meal inclusion. Egg diameters increased gradually with the increase of krill meal inclusions, but significant differences were only found from 100% group to groups of 0 and 20% (P<0.05). From the above results, it showed that the growth performance, ovarian nutrient composition, hepatic anti-oxidant capacity and non-specific immunity, and fecundity will not be influenced when 20% fish meal were replaced by Antarctic krill meal in diets of female swamp eels. Higher substitutions of Antarctic krill meal will intensify the adverse effect on this fish species. Therefore, the substitution of Antarctic krill meal of fish meal should not exceed 20% in formulated diets of female Monopterus albus.
- Antarctic krill meal,
- Fish meal,
- Growth performance,
- Fecundity performance,
- Monopterus albus

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ANTARCTIC KRILL MEAL REPLACEMENT OF FISH MEAL ON GROWTH PERFORMANCE AND FECUNDITY OF FEMALE MONOPTERUS ALBUS

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