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| Effects of aquaponics mode on growth and digestive enzyme activities of GIFT tilapia |
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| DOI：10.16768/j.issn.1004-874X.2017.01.021 |
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| Abstract: |
| GIFT tilapia（ Oreochromis niloticus） was used as animal model，and three aquaculture modes，
including herba houttuyniae（ Houttuynia cordata Thunb.）-tilapia intensive aquaponics mode（ IAM），herba
houttuynia-tilapia-yellow catfish（ Pelteobagrus fulvidraco） polyculture aquaponics mode（ PAM） and conventional
intensive aquaculture mode（ CIAM），were selected to investigate the effects of aquaponics on growth and digestive
enzyme activities of GIFT tilapia. Results showed that on the level of growth performances，the hepatosomatic index
of tilapia in IAM was the lowest. However，there was no significant difference on average weight and relative fatness indices among the tilapia under three modes. For digestive enzyme activities，the stomach protease activity of tilapia
in CIAM was significantly lower than that in other two modes. While the protease activity of tilapia hepatopancreas
in IAM and protease activity of tilapia foregut in PAM were the highest，respectively，during most of experimental
months. Moreover，both in July and October，the lipase activity of tilapia hepatopancreas and foregut in IAM were the
highest. The amylase activity of tilapia foregut in IAM was the highest. The lowest amylase activity of hepatopancreas
was observed in IAM in August，and the amylase activity of hepatopancreas in IAM was significantly higher than that
in CIAM in September，while the other groups showed no significant difference. Herba houttuynia ecological floating
flats can improve the water quality for aquacultural environment，thus，intensive aquaponics mode showed higher
digestive ability. The stocking density of fish in polyculture aquaponics mode was too intensive，which led to the
crowding stress，damaged the growth and health of tilapia. |
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