EFFECTS OF TEMPERATURE AND SALINITY ON EMBRYONIC DEVELOPMENTOF MEGALOBRAMA HOFFMANNI

Responses of Megalobrama hof f manni embr yos to various incuba tion water tempe ratures and salini ty were measured in terms of h atchability and survival rate .The upper and lower limit ing incubat ion tempera tur es were est ima ted at 31and 20 ℃respect ively . The opt imum incubat ion temper ature f or Megalobrama hof fmanni embryos was 24 -28 ℃. Time for embr yonic development was inversely related to incubat ion temperature .Eff ects of temperature on embryonic development was gre ater in later period than in the pr evious one .The upper limit ing incubation salinity was 11 , while the opt imum r ange were estimated to be 0 -7 .A certain r ange of salinity had some posit ive cont ribut ions to embryonic development and hatchabil ity .The effects of salinity on Megalobrama hof fmanni embryos wer e not so obvious as the temperature was .