Page 56 - 《渔业研究》2026年第2期

第 2 期 李耀国等： 大口黑鲈工厂化循环水苗种培育和池塘成鱼养殖的水质处理效率分析 199

Analysis of water treatment efficiency in factory-based recirculating
aquaculture system larval cultivation and pond culture for
largemouth bass (Micropterus salmoides)

LI Yaoguo，ZHOU Gang，ZHOU Cheng，LI Bin
(College of Fisheries, Hunan Agricultural University, Changsha 410128, China)

Abstract: [Objective] This study aims to investigate the water quality control requirements for factory-based
recirculating aquaculture system fry cultivation and pond grow-out of largemouth bass (Micropterus salmoides),
providing scientific basis for improving water quality management techniques. [Methods] The water treatment
efficiency of microfiltration unit, nitrification tanks, and pond application of Bacillus spp. was evaluated based
on water quality regulation technology. [Results] 1) Factory-based recirculating aquaculture fry cultivation:
total phosphorus (TP) and total nitrogen (TN) concentrations in the culture tanks were significantly affected by
feeding amount (P<0.01), and they increased as the feeding amount increased or decreased as the feeding
amount decreased. The microfiltration machines achieved removal rates of (16.26±6.87)% for suspended solids
(SS) and (12.94±5.07)% for chemical oxygen demand (COD). The biofilter removed (18.51±7.73)% of total
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ammonia nitrogen (TAN) and (5.87±3.51)% of nitrite nitrogen (NO -N). The nitrification capacity showed an
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overall downward trend as the culture time extended. 2) Grow-out pond culture: Within 6 hours after applying
Bacillus spp., the highest removal rates for SS and COD were observed, with average values of (15.07±3.55)%
and (14.22±2.59)%, respectively. The mean removal rates for TN and TP were (10.35±2.33)% and (8.71±
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0.92)%, respectively. The average removal efficiencies for TAN and NO -N were (9.70±2.81)% and (7.76±
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3.28)%, respectively. [Conclusion] The study has clarified the relationship between the water treatment meth-
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ods and the concentrations of TAN, NO -N, TN, TP, SS, and COD in the aquaculture water for larval
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M. salmoides in factory-based recirculating aquaculture systems and adult fish in pond culture. It has obtained
relevant data on water treatment efficiency, which can provide technological support for the related aquaculture
models of M. salmoides.
Key words: Micropterus salmoides; larval cultivation; pond culture; water quality regulation; water treatment
efficiency