Effects of varying densities on serum reproductive parameters in pen-reared juvenile female rainbow trout Oncorhynchus mykiss farms

Zhishuai Hou; Haishen Wen; Jifang Li; Feng He; Qun Liu; Jinhuan Wang; Biao Guan; Qinglong Wang

doi:10.1007/s00343-016-5172-4

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Effects of varying densities on serum reproductive parameters in pen-reared juvenile female rainbow trout Oncorhynchus mykiss farms

Updated：2023-05-16

- Effects of varying densities on serum reproductive parameters in pen-reared juvenile female rainbow trout Oncorhynchus mykiss farms
- Journal of Oceanology and Limnology Vol. 35, Issue 1, Pages: 98-108(2017)
- Affiliations：
  
  1. Fisheries College Ocean University of China
  2. Key Laboratory of Mariculture Ministry of Education Ocean University of China
- Author bio：
- Funds：
- DOI：10.1007/s00343-016-5172-4
  CLC：
- Online First：11 April 2016，
  
  Published：2017
- Accepted：
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Hou, Z., Wen, H., Li, J. et al. Effects of varying densities on serum reproductive parameters in pen-reared juvenile female rainbow trout Oncorhynchus mykiss farms., Chin. J. Ocean. Limnol. 35, 98–108 (2017). https://doi.org/10.1007/s00343-016-5172-4
DOI：

Hou, Z., Wen, H., Li, J. et al. Effects of varying densities on serum reproductive parameters in pen-reared juvenile female rainbow trout Oncorhynchus mykiss farms., Chin. J. Ocean. Limnol. 35, 98–108 (2017). https://doi.org/10.1007/s00343-016-5172-4 DOI：

摘要

Abstract

The primary goal of this study was to assess the effect of varying densities on serum reproductive parameters of immature rainbow trout Oncorhynchus mykiss. Experimental trout were maintained in intensive

pen-reared farms for 300 days in fresh water reservoirs. Initial densities were 4.6

6.6

and 8.6 kg/m3 (40

80 ind./m3)

indicated as SD1

SD2

SD3

and final densities were 31.1

40.6

49.3 kg/m3

respectively. A summary of the ovarian stages were observed by histological examination. Serum E2 (estradiol)

T (testosterone) were evaluated by radioimmunoassay and FSH (follicle-stimulating-hormone)

LH (luteinizing-hormone)

vitellogenin

17α

20β-P (17α

20βdihydroxy4-pregnen-3-one) were measured by enzyme-linked immunosorbent assay. Our findings demonstrated that ovarian development were retarded (from stage III to stage IV) at highest rearing density (SD3) after 180 days of intensive culture (over 40.6 kg/m3). In addition

we observed an inverse relationship between serum reproductive parameters and rearing density. Furthermore

compared to serum reproductive parameters of SD1

FSH

vitellogenin

17α

20β-P

GSI and LH of two higher density groups decreased firstly and significantly at 60 (over 15.9 kg/m 3 )

180 (over 31.7 kg/m 3 )

180 (over 40.6 kg/m3)

240 (over 36 kg/m3)

240 (over 45 kg/m3) and 300 (over 49.3 kg/m3) days

respectively. Comparing serum reproductive parameters within the same ovarian development stage of rainbow trout from varying densities revealed that higher population density also led to significantly lower overall serum reproductive parameters. Overall

this study presents the reproductive

endocrinological parameters of juvenile female rainbow trout at high rearing densities and indicates the need for rainbow trout (114.44±5.21 g

19.69±0.31 cm) that are initially stocked at 6.6 or 8.6 kg/m3 should be classified and subdivided into lower density after 180 days of farming (not over 31.7 kg/m3).

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references

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