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Effects of food type, temperature and salinity on the growth performance and antioxidant status of the longsnout seahorse, Hippocampus reidi
Author(s) -
Tseng ChungChih,
Chien Jen Hun,
Chu TahWei,
Cheng AnnChang,
Shiu YaLi,
Han TaiWei,
Liu ChunHung
Publication year - 2020
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.14826
Subject(s) - seahorse , biology , zoology , juvenile , salinity , antioxidant , ecology , biochemistry
The effects of food type, salinity and temperature on the growth performance and antioxidant status of Hippocampus reidi juveniles at 2.5 months old were evaluated in this study. Three trials were conducted for 56 days. Seahorses fed frozen mysid shrimp (MD) exhibited significantly higher survival, growth performance and feed efficiency compared with that of seahorses fed frozen adult Artemia (AD) or a mixture consisting of MD and AD at the ratio of 1:1 (MAD). Mortality of seahorse cultured at 30°C reached 100% at 49 days. Despite no significant difference, the survival and growth performance of seahorses were higher at 26 than 28°C. Seahorses had better growth performance at salinities of 15–20 ppt, but the survival and growth performance of seahorses were not significantly different among salinity groups. Seahorses fed MD or MAD had better antioxidant status based on the results of total phenolic content (TPC) and 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) radical scavenging activity in the MD and MAD groups, and significantly higher reducing power in MD than AD. No significant difference in all antioxidant indicators was recorded in 26 and 28°C groups. TPC, DPPH radical scavenging activity and ferric reducing antioxidant power activity of seahorses were significantly higher at 15 and 20 ppt, and metal chelating activity of seahorses at 15 ppt was significantly higher than that of seahorses at higher salinities. Based on these results, H. reidi juvenile is recommended to be fed MD at a temperature of 26°C and salinity of 15–20 ppt.