Report of the Commissioner - United States Commission of Fish and Fisheries . ly examined until they were 48 hours old, when it wasdiscovered that 90 per cent of them were impregnated, but over half ofthem seemed abnormal, the discs being spread out more than usual andmany being segmented in patches or clusters. They were again exam-ined on the 24th, and it was found that 10 per cent of them plainlyshowed well-defined twin discs, and three triplicate discs were discov-ered out of some 500 eggs examined. They were kept under observa-tion from day to day, and micrographs taken. It was also obser
Report of the Commissioner - United States Commission of Fish and Fisheries . ly examined until they were 48 hours old, when it wasdiscovered that 90 per cent of them were impregnated, but over half ofthem seemed abnormal, the discs being spread out more than usual andmany being segmented in patches or clusters. They were again exam-ined on the 24th, and it was found that 10 per cent of them plainlyshowed well-defined twin discs, and three triplicate discs were discov-ered out of some 500 eggs examined. They were kept under observa-tion from day to day, and micrographs taken. It was also observedthat there were many eggs in this lot containing insufficient led to an examination of several other lots of eggs taken late,which in turn revealed the fact that the late eggs contained a muchlarger percentage of insufficient yolks than those taken earlier in theseason. It has been noticed each season since this station was estab-lished that the late eggs did not turn out as well as those taken at the Report U. S. F. C. 1898. (To face page LXX Plate 3. Whitefish, 12 hours, showing first cleavage. Water 38°, 4 Whitefish eggs, 18th hour. Water 38°, showing second segrmentation, four cells forrped
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Keywords: ., bookcentury1800, bookdecade1890, bookpublis, booksubjectfisheries
