Journal of Marine Sciences ›› 2018, Vol. 36 ›› Issue (2): 80-91.DOI: 10.3969/j.issn.1001-909X.2018.02.011

Previous Articles     Next Articles

Effects of natural additives on growth and body color of leopard coral grouper (Plectropomus leopardus)

GUAN Xian-tao1,2, WU Hong-xi*2,3, MA Jian-zhong2, SHAN Le-zhou2, LIN Shao-zhen2   

  1. 1. Collage Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China;
    2. Zhejiang Mariculture Research Institute, Wenzhou 325005, China;
    3. Zhejiang Fisheries Technical Extension Station, Hangzhou 310023, China
  • Received:2016-11-30 Revised:2017-05-05 Online:2018-06-15 Published:2022-11-21

Abstract: In order to investigate the effects of natural additive on Plectropomus Leopardus, 4 kinds of different contents of natural products (astaxanthin, xanthophyll, spirulina and corn gluten meal ) were selected to formulate the baits to feed the leopard coral grouper (Plectropomus leopardus) in a recirculating aquaculture system for seventy-five days. The main growth index and the L* value (Lightness), a* value (red—green) and b* value (yellow—blue) of body color in these fish's eight parts (head cheek, opercula, dorsal, abdomen, dorsal fin, pectoral fin, tail fin and caudal peduncle) were measured by scale, straightedge and colorimeter before and after the experiment. The results show that compared with control group, these four additives have no significant impact on the weight gain rate, specific growth rate, feed coefficient of leopard coral grouper (P<0.05); all of these additives make the L* value slightly smaller, and there are significance occurrings on some parts. Compared with the control group, all of the additives significantly lift the a* value and b* value of leopard coral grouper, among which the experimental feed with astaxanthin has the most significant effect.

Key words: Plectropomus leopardus, astaxanthin, xanthophyll, spirulina, corn gluten meal, body color

CLC Number: