Growth of Longtail Tuna Thunnus tonggol and Small Tuna Euthynnus affinis in Circulating Water Ponds
ZHOU Shengjie1,2,3, YANG Rui1,2,3, YU Gang1,2,3, WU Qia'er 1,2,4, MA Zhenhua1,2,3
1. Tropical Fisheries Research and Development Center, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Sanya 572018, China; 2. Sanya Tropical Fisheries Research Institute, Sanya 572018, China; 3. Key Laboratory of South China Sea Fishery Resources Development and Utilization, Ministry of Agriculture and Rural Affairs, Guangzhou 510300, China; 4. Key Laboratory of Offshore Fisheries Development, Ministry of Agriculture and Rural Affairs, Guangzhou 510300, China
Abstract：Longtail tuna Thunnus tonggol and small tuna Euthynnus affinis juveniles were reared separately in a cylindrical circulating water temperature-controlled and light-controlled cement pond with a diameter of 5m and a water depth of 2.5 m for 60 days under water temperature of (30.6±0.5) ℃, L∶D=14∶10, and water surface light intensity of 2000 lx from June to August 2019, and the morphological traits and body weight were measured before and after cultivation, and the relationship between body weight and body length and the relationship with other morphological indicators, growth indicators and changes in condition factor were analyzed to explore the growth of longtail tuna and small tuna under indoor circulating aquaculture conditions. The results showed that except for the snout length, the second dorsal fin length and the caudal peduncle length, there was good fitting relationship between the total length and other morphological indicators in longtail tuna (r2>0.9). Except for the snout length, the first dorsal fin length and the second dorsal fin length, there was good fitting relationship between the total length and other morphological indicators in small tuna (r2>0.9). The longtail tuna had body length-weight relationship as y=0.0128x3.0663, r2=0.966, with b of 3.066, close to 3, showing isokinetic growth under the culture conditions. The small tuna had the fitting equation of the body length-weight relationship as y=0.0005x4.0298, r2=0.9322, with b of 4.030, larger than 3, indicating positive allometric growth under culture conditions. The longtail tuna had relative condition factor of 0.930±0.035 and the small tuna had relative condition factor of 1.285±0.026 when captured. In two month cultivation, the relative condition factor was found to be 1.044±0.075 in longtail tuna and 1.929±0.087 in small tuna, significant higher than that at the capture (P<0.05). The findings indicate that longtail tuna and small tuna have better growth than that in the natural environment, and that the relevant data provide reference for the subsequent land-based artificial farming of small size tuna.
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2021, Vol. 40 
