Page 88 - 《渔业研究》2025年第3期

第 3 期 张 艺： 不同碳源对大黄鱼育苗水体生物絮团形成、水质及育苗效果的影响 345

Effects of different carbon sources on the bioflocs formataion, water quality and
seeding effects of large yellow croaker (Larimichthys crocea) seedling water

ZHANG Yi
(Mindong Fisheries Research Institute of Fujian Province, Ningde 352100, China)

Abstract: [Objective] The bioflocs technology has been widely used in aquaculture, playing a role in water
conservation and emission reduction. This technology is currently applied to artificial breeding of large yellow
croaker (Larimichthys crocea). The study aims to discuss the effects of different carbon sources on the forma-
tion of bioflocs, water quality and seeding effects in the water of L. crocea fry cultivation. [Methods] Glucose,
sucrose, and brown sugar were used as carbon sources. Three experiment groups with a carbon-nitrogen ratio
(C/N) of 15 and one control group without carbon sources were set up for L. crocea fry cultivation experiments.
[Results] The results showed that after 30 days of cultivation, the bioflocs volumn (BFV) and total suspended
solids (TSS) values of each experiment group were significantly higher than those of the control group (P<0.01),
while the BFV and TSS values of the brown sugar group were significantly higher than those of the glucose
group and the sugar group. The crude proteins content of bioflocs in each experiment group was significantly
higher than that in the control group (P<0.05), while the crude proteins content of bioflocs in the brown sugar
group was significantly higher than that in the glucose group and the sugar group (P<0.05). The differences in
ammonia nitrogen and nitrate content values among the experiment groups were not significant (P>0.05), but
were significantly lower than those in the control group (P<0.01). The nitrite content values in each experiment
group were significantly lower than those in the control group (P<0.01), and the nitrite content in the brown sug-
ar group was significantly lower than that in the glucose group and the sugar group (P<0.05). The pH values of
each experiment group were significantly lower than those of the control group (P<0.05), and the brown sugar
group had the lowest pH value, which was significantly lower than the glucose group and the sugar group. The
absolute growth rate and specific growth rate of L. crocea yellow croaker fry in each experiment group was sig-
nificantly higher than that in the control group (P<0.05). The brown sugar group had the highest absolute
growth rate of L. crocea fry, which was significantly higher than the glucose group and the sugar group (P<

0.05). The survival rate of L. crocea fry in each experiment group was significantly higher than that in the con-
trol group (P<0.05), while the brown sugar group had the highest survival rate, which was significantly higher
than the glucose group and sugar groups (P<0.05). [Conclusion] The experimental findings revealed that all
test groups successfully enhanced aquaculture water quality and efficiency, with brown sugar emerging as the
most effective carbon source. The results of this study could provide a reference for optimizing the bioflocs
breeding technology of L. crocea.
Key words: Larimichthys crocea; carbon source; bioflocs; water quality