Abstract
Near Vancouver, Canada, Clinocottus acuticeps spawns circular monolayer egg masses on rock surfaces at the 3.0- to 3.7-m tide levels from January through April. At these tide levels, air exposure occurs about half the time and most egg masses have clumps of Fucus distichus lying over them during low tides. Controlled removal of the F. distichus demonstrated a role of this plant in reducing egg mortalities and a preference by adult fish to spawn under macrophytic algae.Early embryonic stages were most susceptible to mortalities resulting from removal of cover plants in the field. In laboratory air-exposure tests, desiccation was more important than temperature elevation in causing mortalities.
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