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A Pilot Study on the Long Term Anatomical Effects of Ectomy of the Urophysial System in the Teleost Fish Rutilus rutilus
Author(s) -
Fridberg Gunnar,
Ekengren Bo
Publication year - 1978
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1111/j.1463-6395.1978.tb01039.x
Subject(s) - biology , rutilus , mesonephros , anatomy , fish <actinopterygii> , peduncle (anatomy) , osmoregulation , cloaca , zoology , fishery , ecology , biochemistry , embryonic stem cell , salinity , gene
Roaches 16 months old survive the removal of the urophysial system for more than 11 months. The absence of the system for this period had some very significant anatomical effects. The growth of the fish as well as the viscera was strongly retarded whereas the kidneys, the mesonephros, were enlarged. If the caudal peduncle was cut away from the 6—7 vertebrae numbered from the urostyle a new system regenerated and the fish showed normal growth and development. If the site of pedunclectomy was at vertebra 12 numbered from the tailfin or anterior to it no regeneration of the system took place. The urophysial hormones seem to play an important role as synergetic factors for normal growth and development of the fish. Observations indicate their possible interaction with the preoptico‐hypophysial system in osmoregulation.