The salinity tolerance of trichodinids (Protozoa) parasitic on the Three-spined stickleback Gasterosteus aculeatus


  • H. J. G. Dartnall

    1. Department of Zoology and Comparative Physiology, Queen Mary College, Mile End Road, London
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    • *British Antarctic Survey, Life Sciences Division, Monks Wood Experimental Station, Abbots Ripton, Huntingdon.


Sticklebacks from a variety of habitats have been examined for trichodinids. Two species of trichodinid were found on fish at every site. They were identified as Trichodina domerguei subsp. domerguei and T. tenuidens, and these identifications are discussed in relation to previous observations by other workers. The tolerance to change in salinity has been examined for both species and the activity of the contractile vacuole of T. domerguei has been examined in detail.