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Published online by Cambridge University Press: 17 January 2013
The interests connected with the natural family of the Salmonidæ, both in relation to river-sport, the pleasant recreation of angling, and to material wealth, in the instances of the migratory kinds, are so considerable and fully admitted, that I trust no apology is required for submitting to the Society any observations in the least likely to contribute to a more intimate knowledge of the species, whether as regards their structure or their habits.
page 252 note * The above results were obtained in the month specified. The eggs were from minnows from the river Rothay, a tributary of Windermere. On the 6th of May, they were impregnated by the artificial process, and placed in water, varying in temperature from 50° to 54°, which was changed daily. One fœtal fish burst its shell on the 11th of May; the next on the night of the 12th; the majority on the following day; some did not appear till the 15th. On the 31st of the same month, most of them had acquired their permanent fins.
In substance, the eggs of the minnow were found similar to those of the Salmonidæ, being composed of oil globules, and of an albuminous fluid, coagulable by admixture with water.
Some of the ova to which no milt was added—the omission intentional—died without showing the slightest appearance of organic development.