JIN Gang, XIE Ping, LI Zhong-Jie. FOOD HABITS OF 2-YEAR-OLD CHINESE MITTEN CRAB, ERIOCHEIR SINENSIS, STOCKED IN LAKE BAO'AN[J]. ACTA HYDROBIOLOGICA SINICA, 2003, 27(2): 140-146.
Citation: JIN Gang, XIE Ping, LI Zhong-Jie. FOOD HABITS OF 2-YEAR-OLD CHINESE MITTEN CRAB, ERIOCHEIR SINENSIS, STOCKED IN LAKE BAO'AN[J]. ACTA HYDROBIOLOGICA SINICA, 2003, 27(2): 140-146.

FOOD HABITS OF 2-YEAR-OLD CHINESE MITTEN CRAB, ERIOCHEIR SINENSIS, STOCKED IN LAKE BAO'AN

  • Received Date: December 19, 2001
  • Rev Recd Date: July 04, 2002
  • Published Date: March 24, 2003
  • Gastric mills of 362 specimens of the 2-year-old Chinese mitten crab, Eriocheir sinensis, which contained recognizable food items, in Lake Bao'an were examined. The crab specimens sampled were preserved immediately in 8% formalin and analyzed within 20 days, except specimens in April, May and June which were observed immediately after the crabs were captured. In the laboratory, carapace width (cw) were measured using caliper, and sex recorded. The gastric mills were dissected out, and the food contents of each individual were flushed into a 5 ml plastic tube with 5% formalin and stirred lightly using tweezers to break up and then examined under a binocular microscope at 160× to 600×. All food items were identified to the lowest possible taxonomic level and later sorted into fourteem dietary categories: macrophytes, algae (Cyanophyta, Chlorophyta, Euglenophyta, Bacillariophyta, Xanthophyta), arthropods, oligochaetes, fishes, protozoan, rotifer, gastropods, detritus and the unidentified animal tissue. The results showed that the crab is omnivorous, with tendency for carnivory, feeding on members of benthic communities. The food items' percent frequency of occurrence was 87.3% (macrophytes), 82%(algae, including 47 genera), 48.2%(arthropods), 28.2%(oligochaetes), 28.7%(fish), 0.3%(protozoans), 0.6%(rotifers), 0.3%(gastropods) and 88.7%(detritus). Unidentified animal tissues were often observed, with an occurrence frequency of 46.1%. In total, the frequency of occurrence of plants (macrophytes+algae) is 87.7% and animals 89.8%. However, 5.8% of the gastric mills was filled only by animals, 5.3% by macrophytes and 0.3% by algae. T-test showed there was no significant difference in food habits between sexes (p>0.05). Correlation analysis indicated that there was no ontogenetic diet shift in the 2-year-old crab. The ratio of cell number of macrophytes to algae was about 118—219:1. Finally, some difficult questions in studying food habits of the crab were discussed.
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    Chen B, Du N, Ye H. Analysis on the feeding habit of the mitten crab Eriocheir sinensis [J]. Fisheries Science Technology Information, 1989, 16(1):2-5.[陈炳良、堵南山、叶鸿发,河蟹的食性分析[J]. 水产科技情报,1989,16(1):2-5][2] Du N. Carcinology [M]. Science Press, Beijing, 1993, 744.[堵南山,甲壳动物学(下册)[M]. 北京,科学出版社. 1993,744][3] Zhu, X., Y. Cui and S. Guang, Food selection and Digestibility of three natural diets for the Chinese mitten crab (Eriocheir sinensis) [J]. Acta Hydrobiologaca Sinica, 1997,21(1):94-96.[朱晓鸣、崔奕波、光寿红,河蟹对三种天然饵料的选食性及消化率[J]. 水生生物学报,1997,21(1):94-96][4] Halat K M, Resh V H. The Chinese mitten crab (Eriocheir sinensis): Implications for the freshwater habitats of the San Francisco Bay and Delta Ecosystem [R]. Abstract From the sixth international zebral mussel and other aquatic nuisance species conference. 1996, Dearborn, Michigan.[5] Zu G. Utilization and protection of submerged plant resources by pen-crab culturingin Nushan Lake [J]. Journal of Lake Sciences, 1999, 11(1):91-96.[祖国掌,围栏养蟹利用与女山湖沉水植物资源保护[J]. 湖泊科学,1999, 11(1):91-96][6] Liang, Y. H. Liu, Resources, environment and fishery ecological management of macrophytic lakes [M]. Science Press, Beijing, China. 1995.[梁彦龄,刘伙泉,草型湖泊资源、环境与渔业生态学管理[M]. 北京,科学出版社. 1995][7] Wu R S S, Shin P K S. Food segregation in three species of portunid crabs [J]. Hydrobiologia, 1998,362:107-113[8] Aurioles-Gamboa D, Perez-Flores R. Seasonal and bathymetric changes in feeding habits of the benthic red crab Pleuroncodes planipes (Decapoda, Anomura, Galatheidae) off the Pacific coast of Baja California Sur, Mexico [J]. Crustaceana, 1997,70(3):272-287[9] Kennith, R. and Williams, G. A. Feeding preferences of the herbivorous crab Grapsus albolineatus: the differential influence of algal nutrient content and morphology [J]. Mar. Ecol. Prog. Ser. 1996,147(1-3):87-95[10] Jensen, G. C. and Asplen, M. K. Omnivory in the diet of juvenile dungeness crab, Cancer magister Dana [J]. J. Exp. Mar. Biol. Ecol. 1998,226(2):175-182[11] Shen, Y. Ecological studies on the periphytic protozoa in Lake Dong Hu, Wuhan [J]. Acta Hydrobiologica Sinica, 1980,7(1):19-40.[沈韫芬,武汉东湖周丛原生动物生态[J]. 水生生物学集刊,1980,7(1):19-40][12]Hepher, B. Principles of fish nutrition. In M. Shilo S. Sargig (eds), Fish Culture in Warm Water System: Problems and trends [M]. Boca Raton, Florida, CRC Press, 1989, 121-142[13] Collins, P. A. and Paggi, J. C. Feeding ecology of Macrobrachium borelli (Nobili) (Decapoda: Palaemonidae) in the flood valley of the River Parana, Argentina [J]. Hydrobiologia, 1998,362:21-30[14] Zhang, T. and Li, Z. Some observations on the biology of the bitterling Paracheilognathus imberbis in the Niushan Lake (Hubei, China). Acta Hydrobiologica Sinica, 1999,23(Suppl.):164-170[15] Williams, M. J. Natural food and feeding in the commercial sand crab Portunus pelagicus Linnaeus, 1766 (Crustacea: Decapoda: Portunidae) in Moreton Bay, Queensland [J]. J. Exp. Mar. Ecol. 1982,59:165-176[16] Liu, J K. Advanced hydrobiology [M]. Beijing, Science Press. 1998,151-175.[刘建康,高级水生生物学[M]. 北京,科学出版社. 1998,151-175]
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