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| Age and Growth of Crucian Carp Carassius auratus in Huangpu River and Dianshan Lake |
| ZHANG Yuanyuan1, CHEN Wenyin2, HU Zhongjun3, LIU Dong1,2,3 |
1. Systematic Classification and Evolution of Marine Animals Key Laboratory of Shanghai University, Shanghai 201306, China;
2. Key Laboratory of Exploitation and Utilization of Aquatic Germplasm Resources, Ministry of Education, Shanghai 201306, China;
3. National Experimental Teaching Demonstration Center of Fisheries Science, Shanghai Ocean University, Shanghai 201306, China |
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Abstract From March to October 2018, total 1099 samples of crucian carp Carassius auratus were bimonthly collected in 8 sampling sites in the upper Huangpu River and Dianshan Lake by a trap, three-layer deep-water gill net and trawl net with a mesh of 5 mm. Otoliths and scales were used as age determining materials to investigate age structure, growth characteristics, and female-to-male ratio of crucian carp to provide scientific basis with assessing stock resources and population structure. The results showed that crucian carp samples were consisted of 1—5 years old fish, with dominant age class of 1—2 years old in Huangpu River and 1—3 years old in Dianshan Lake, accounting for 82% and 94% of the total samples, respectively. The crucian carp had mean body length of (12.10±2.20) cm and mean body weight of (69.49±48.16) g, with power function relationship between body length and body weight of m=0.0258L3.1178(r2=0.93), in Huangpu River, and had mean body length of (12.20±2.50) cm and mean body weight of (71.51±47.82) g, with power function relationship between body length and body weight of m=0.0121L3.4010(r2=0.97), in Dianshan Lake, both being allometric growth type due to having growth index b>3. The growth inflection point age of 2.59 years old was observed in Huangpu River, and 3.05 years old in Dianshan Lake. There was female to male ratio of 1.77∶1 for crucian carp in Huangpu River, and 1.79∶1 in Dianshan Lake. The findings indicated that the populations of crucian carp in Huangpu River and Dianshan Lake were simple and young in structure, with significantly lower sex ratios than that in other waters, and that the resources were increased by artificial release, which provides basic information for proliferation and effect valuation of artificial release.
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Received: 19 August 2019
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