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Diel variations in carbonate incorporation into otoliths in goldfish
Author(s) -
Tohse H.,
Mugiya Y.
Publication year - 2002
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2002.tb01746.x
Subject(s) - diel vertical migration , biology , carbonate , zoology , carassius auratus , photoperiodism , fish <actinopterygii> , dissolved organic carbon , total inorganic carbon , environmental chemistry , fishery , botany , ecology , chemistry , carbon dioxide , organic chemistry
When D‐[ 14 C‐U]‐glucose was administered intraperitoneally into goldfish Carassius amatus at 20° C and 12L: 12D (dark period 1800–0600 hours) at 0600, 1200, 1800, 2400 and 0600 hours on the following day, glucose was metabolized to release 14 CO 2 and then it was incorporated into otoliths as carbonate. The rate of metabolic activity, judging from the ratio of inorganic to organic radiocarbon in plasma, was low during the dark period. Carbon incorporation into otoliths was also minimized during 1800–2400 h. When fish were exposed to ambient water containing NaH 14 CO 3 , plasma radioactivity was lowest during 1800–2400 hours, during which time carbon incorporation into otoliths was lowest. Plasma total CO 2 levels markedly increased during the dark period. These results clearly indicate that carbonate formation in otoliths has a diel variation with a nadir lasting 6 h from 1800 to 2400 hours under the photoperiod used.