Artificial propagation of the shad and pike perch . H and /. Two views of an egg after the blastoderm has spread considerably and the embryonic area e iswell defined. K. View of nnhatched embryo, which developed in a temperature of 45° F., producing distortions of tailand notochord. L. An egg-envelope with its contained embryo, forty-four hours after impregnation, viewed as a trans-parent object. M. An egg-envelope with its contained embryo at the beginning of the third day of development. Froma photograph. N. Anterior portion of a young fish on fourth day. To show relations of liver L to yolk
Artificial propagation of the shad and pike perch . H and /. Two views of an egg after the blastoderm has spread considerably and the embryonic area e iswell defined. K. View of nnhatched embryo, which developed in a temperature of 45° F., producing distortions of tailand notochord. L. An egg-envelope with its contained embryo, forty-four hours after impregnation, viewed as a trans-parent object. M. An egg-envelope with its contained embryo at the beginning of the third day of development. Froma photograph. N. Anterior portion of a young fish on fourth day. To show relations of liver L to yolk Y, over whichthe portal vessel pv passes forward to empty into the venous sinus, in common with the anterior andposterior jugulars j and j, ba bulbus aorta?, ve ventricle. O. View of fore part of a young fish 17 days old, from ventral side. Plate P. Young fish immediately after hatching, viewed as an opaque object and somewhat obliquely from one side,to display the relations of branchial and hyomandibular arches, and position of pectoral fin. Q. Young fish third day after hatching, viewed as a transparent ooject to show extension of segmental ductforward; chorda ch. R. Young fish 5 days after hatching, very much enlarged, and viewed as an opaque object. Only a slight rem-nant of the yolk-sac Y remains. S. Young fish 1? days after hatching, viewed partly as an opaque and partly as a transparent object; py pylorusand rudimentary air-bladder above it; I intestine, filled with the remains of ingested food. The opercula arealready so far developed as partly to conceal the gills. MANUAL OF FISH-CULTURE. 125 found full of these eggs of different sizes. Shortly before spawning,transparent eggs of large size, contrasting strongly with the opaquegolden hue of less mature ones, will be found scattered through the stillcompact ovarian mas
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherwashi, bookyear1903
