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Reproductive physiological characteristics of tropical Celebes eels Anguilla celebesensis in relation to downstream migration and ovarian development.
- Source :
-
Journal of fish biology [J Fish Biol] 2020 Mar; Vol. 96 (3), pp. 558-569. Date of Electronic Publication: 2020 Jan 20. - Publication Year :
- 2020
-
Abstract
- Downstream-migrating (n = 64) and non-migrating (n = 21) female Celebes eels Anguilla celebesensis were captured from the Poso Lake-River system on Sulawesi Island, Indonesia, and their reproductive physiological characteristics were examined. A histological observation of the ovaries revealed that most non-migrating eels were at the perinucleolus (43%) or oil-droplet (48%) stage, whereas most migrating eels were at the early vitellogenic (36%) or midvitellogenic (61%) stage. Transcript levels of gonadotropin genes (fshb, lhb) in the pituitary gland and concentrations of sex steroids [11-ketotestosterone (11-KT), testosterone, 17β-oestradiol (E <subscript>2</subscript> )] in blood plasma of migrating eels were significantly higher than those of non-migrating eels. The fshb messenger (m)RNA levels were lower in perinucleolus and oil-droplet stages and then significantly increased in the early vitellogenic stage. The lhb mRNA levels in vitellogenic-stage eels were significantly higher than those in perinucleolus- and oil-droplet-stage eels. The 11-KT levels of eels at the oil-droplet and vitellogenic stages were significantly higher than those of eels at the perinucleolus stage. The E <subscript>2</subscript> levels at the vitellogenic stage were significantly higher than those at the perinucleolus and oil-droplet stages. These dynamics of the reproductive hormones represented the physiological background of oogenesis in A. celebesensis that has remarkably well-developed oocytes just before downstream migration.<br /> (© 2019 The Fisheries Society of the British Isles.)
- Subjects :
- Anguilla anatomy & histology
Anguilla blood
Animals
Female
Gene Expression Regulation, Developmental
Gonadal Steroid Hormones blood
Gonadal Steroid Hormones genetics
Indonesia
Oogenesis
Pituitary Gland metabolism
Rivers
Vitellogenesis
Anguilla physiology
Animal Migration
Ovary growth & development
Reproduction physiology
Subjects
Details
- Language :
- English
- ISSN :
- 1095-8649
- Volume :
- 96
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Journal of fish biology
- Publication Type :
- Academic Journal
- Accession number :
- 31837014
- Full Text :
- https://doi.org/10.1111/jfb.14231