Volume 41 Issue 12
Dec.  2022
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Chunyan Zhao, Liang Chi, Yongshuang Xiao, Bing Li, Yunliang Lu, Yanting Cui, Wenqi Wang, Jun Li. Morphological and histological changes in the brains of turbot (Scophthalmus maximus) with gonadal development[J]. Acta Oceanologica Sinica, 2022, 41(12): 115-122. doi: 10.1007/s13131-022-2041-1
Citation: Chunyan Zhao, Liang Chi, Yongshuang Xiao, Bing Li, Yunliang Lu, Yanting Cui, Wenqi Wang, Jun Li. Morphological and histological changes in the brains of turbot (Scophthalmus maximus) with gonadal development[J]. Acta Oceanologica Sinica, 2022, 41(12): 115-122. doi: 10.1007/s13131-022-2041-1

Morphological and histological changes in the brains of turbot (Scophthalmus maximus) with gonadal development

doi: 10.1007/s13131-022-2041-1
Funds:  The National Natural Science Foundation of China under contract Nos 31802319, 31972784 and 31802269; the Natural Science Foundation of Shandong Province under contract No. ZR2018BC053; the Agricultural Application Technology Innovation Project of Shandong Province under contract No. SD2019YY006; the Advanced Talents Foundation of Qingdao Agricultural University under contract Nos 6631119055 and 6631119032.
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  • Corresponding author: E-mail: wenqi31@163.com; junli@qdio.ac.cn; junli@qdio.ac.cn
  • Received Date: 2021-09-13
  • Accepted Date: 2022-03-18
  • Available Online: 2022-09-05
  • Publish Date: 2022-12-30
  • The brain plays a critical role in controlling reproduction through the hypothalamus-pituitary-gonadal (HPG) axis in vertebrates. Turbot (Scophthalmus maximus) has become an economically important marine fish in Europe and North China. Previous research investigating turbot reproduction has focused on the role of the HPG axis in regulating egg and sperm production. However, the morphology and histology of the organs in the HPG axis have not been studied. In this study, we investigated the morphology and histology of brains in female and male turbot at different stages of gonadal development. The results showed that the brains of both female and male turbot were composed of seven parts that are typical of advanced teleosts: the telencephalon, diencephalon, cerebellum, hypothalamus, pituitary gland, myelencephalon, and olfactory bulbs. The telencephalon was well-developed and contained five distinct lobes, with the contiguous diencephalon at the caudal portion. The torus longitudinales and rostral torus semicircularis of the mesencephalon flattened along the dorsal surface, and the rostral corpus cerebellum was located in the dorsal portion. The actual total brain volume in mature males was significantly greater (p<0.05) than that of females with gonadal development. Notably, the pituitary volume in male turbot significantly increased (p<0.05) from immature to mature stage, but this difference did not occur in females. The data together illustrate a distinct sex difference in the turbot brain during gonadal development, providing insight into their HPG axes.
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