The drinking rate of cod larvae 1–7 days post hatching was measured from the uptake of3H-labelled dextran (MW = 70000) admixed in the incubation seawater (34 ppt 5°C). The drinking rate increased gradually from 0.15% to 0.59% of the larval body weight on day 1 and day 7 respectively. This increase in drinking rate correlated with an observed decrease in the volume of the yolk sac and its water store. Autoradiographs showed the labelled dextran to be confined to the intestine. Electron micrographs showed an open mouth communicating with the oesophagus and the intestine in cod larvae at the time of hatching. Chloride cells were present on the opercular folds but not on the vestigial, developing gills. The data indicate that the water acquisition mechanism of larval cod is similar to that of adult marine fish.
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Arnfinnsson, J. 1984. Functional morphology of the alimentary canal of cod larvae (Gadus morhua L.). Thesis Dissertation, University of Bergen, Norway.
Fletcher, C.R. 1978. Osmotic and ionic regulation in the cod (Gadus callarias L.) I. Water balance. J. Comp. Physiol. 124: 149–155.
Flood, P.R. 1976. Elektronmikroskopisk Prepareringsteknikk for Biologer. Institute of Anatomy, University of Bergen.
Foskett, J.B. and Scheffey, C. 1982. The chloride cell: definitive identification as the saltsecretory cell in teleosts. Science 215: 164–166.
Gahan, P.B. 1972. Autoradiography for Biologists. Academic Press, New York and London.
Guggino, W.B. 1980. Water balance in embryods ofFundulus heteroclitus andF. bermudae in seawater. Am. J. Physiol. 238: R36–R47.
Hickman, C.P. and Trump, B.F. 1969. The kidney.In Fish Physiology vol. 1. pp 91–239. Edited by Hoar, W.S. and Randall, D.J. Academic Press, New York.
Keys, A.B. and Wilmer, E.N. 1932. ‘Chloride secreting cells’ in the gills of fishes, with special reference to the common eel. J. Physiol. 76: 368–378.
Langman, J. 1969 Medical Embryology. The Williams and Wilkins Company, Baltimore.
Mangor-Jensen, A. 1986. Water balance in developing eggs of the codGadus morhua L. Fish Physiol. Biochem., in press.
Mangor-Jensen, A. and Fyhn, H.J. 1985. Cod egg osmoregulation seems unaffected by oil exposure. Mar. Environ. Res. 17: 262–265.
Potts, W.T.W. 1976. Ion transport and osmoregulation in fish.In Perspectives in Experimental Biology, 1, Zoology. pp 65–75. Edited by Davies, P.S. Pergamon Press, Oxford.
Shelbourne, J.E. 1957. Site of chloride regulation in marine fish larvae. Nature, Lond. 180: 920–922.
Smith, H.W. 1930. The absorption and secretion of water and salts by marine teleosts. Am. J. Physiol. 93: 480–505.
Tilseth, S., Solberg, T.S. and Westrheim, K. 1984. Sublethal effects of the water-soluble fraction of Ekofisk crude oil on the early larval stages of cod (Gadus morhua L.). Mar. Environ. Res. 11: 1–16.
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Mangor-Jensen, A., Adoff, G.R. Drinking activity of the newly hatched larvae of codGadus morhua L.. Fish Physiol Biochem 3, 99–103 (1987). https://doi.org/10.1007/BF02183004
- chloride cells