RESEARCH PAPER

Effects of Two Phospholipids Addition in Palm Oil-Based Diet on Growth, Gonad Development and Nutritional Composition of Sea Urchins (Strongylocentrotus intermedius)

  • TANG Lu ,
  • HEQIU Yuqing ,
  • CHI Xiaowan ,
  • ZHANG Feng ,
  • NING Yanchang ,
  • DING Jun ,
  • CHANG Yaqing ,
  • ZUO Rantao
Expand
  • Key Laboratory of Mariculture and Stock Enhancement in North China's Sea, Ministry of Agriculture and Rural Affairs, College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China

Received date: 2021-12-15

  Online published: 2022-07-14

Abstract

This experiment was conducted to investigate the effects of two phospholipids addition in palm oil-based diet on growth, gonad development and nutritional composition of sea urchin Strongylocentrotus intermedius. The casein and soybean meal were included as the main protein sources, the soybean lecithin was added to fish oil diet as control group diet, and the soybean lecithin (PO+SL group) and krill oil (PO+KO group) were added to palm oil diets as experimental group diets, respectively. Forty-five Strongylocentrotus intermedius with initial body weight of (18.86±0.55) g were randomly allocated to 3 groups, deed the above three diets, respectively, each groups contained 15 sea urchins, and individually held in cages. The experiment lasted for 42 days. The results showed as follows:1) there was no significant difference in final body weight, weight gain rate and gonad wet weigh among all groups (P>0.05). The gonadosomatic index of PO+SL group was significantly lower than that of the control group (P<0.05). 2) The gonad moisture content of PO+SL group was significantly higher than that of PO+KO group and control group (P<0.05), the gonad crude protein content of PO+SL group was significantly lower than that of the control group (P<0.05). 3) There were no significant differences in gonad brightness and redness values among all groups (P>0.05). The gonad yellowness value of PO+SL group was significantly lower than that of PO+KO group and control group (P<0.05). 4) The gonad tissue section showed that the gonad development rate of PO+SL group was the slowest, with both male and female individuals developed to phase Ⅱ. The male individual gonad of PO+KO group and control group developed rapidly, all developed to phase Ⅲ; while female individual gonad developed to phase Ⅱ. 5) The contents of total amino acids (TAA), essential amino acids (EAA), sweet amino acids, delicious amino acids and bitter amino acids in gonad of PO+SL group were significantly higher than those of PO+KO group and control group (P<0.05). 6) The contents of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in gonad of PO+KO group and control group were significantly higher than those of PO+SL group (P<0.05). In conclusion, the soya lecithin or krill oil addition in palm oil-based diets do not affect the weight gain rate of Strongylocentrotus intermedius. Compared with the soya lecithin, the krill oil can increase the gonadosomatic index, development rate, and essential fatty acid content of Strongylocentrotus intermedius.

Cite this article

TANG Lu , HEQIU Yuqing , CHI Xiaowan , ZHANG Feng , NING Yanchang , DING Jun , CHANG Yaqing , ZUO Rantao . Effects of Two Phospholipids Addition in Palm Oil-Based Diet on Growth, Gonad Development and Nutritional Composition of Sea Urchins (Strongylocentrotus intermedius)[J]. Chinese Journal of Animal Nutrition, 2022 , 34(7) : 4674 -4688 . DOI: 10.3969/j.issn.1006-267x.2022.07.054

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