yolk-sac

In its ball-like form and short thick peduncle, the yolk-sac of Centrophorus agrees with Squalus, and differs greatly from that of Galeus, which I have described as of peculiar shape, provided with a long umbilical cord, entering the sac towards the larger end.

Notes on New Zealand Fish tellurian 2007

They are all of similar size, being 165 mm. in length, but had evidently not nearly reached their full foetal development, as the yolk-sac is large 66 mm. in diameter and almost globular.

Notes on New Zealand Fish tellurian 2007

This yolk-sac allows the alevin to attain a relatively large size in the first month or so of its life and eliminates the total dependence on feeding.

Trout and Salmon of North America Robert J. Behnke 2002

This yolk-sac allows the alevin to attain a relatively large size in the first month or so of its life and eliminates the total dependence on feeding.

Trout and Salmon of North America Robert J. Behnke 2002

This yolk-sac allows the alevin to attain a relatively large size in the first month or so of its life and eliminates the total dependence on feeding.

Trout and Salmon of North America Robert J. Behnke 2002

This yolk-sac allows the alevin to attain a relatively large size in the first month or so of its life and eliminates the total dependence on feeding.

Trout and Salmon of North America Robert J. Behnke 2002

It was known by the 1860's that various nutritive, respiratory, and excretory organs (yolk-sac, allantois) characteristic of embryos are lacking in all adults.

RECAPITULATION JANE OPPENHEIMER 1968

_Philozoon_ (far better than a yolk-sac) survive a fortnight or more in

Scientific American Supplement, No. 324, March 18, 1882 Various

On developing this bubble they are unable to stay at the bottom as they usually do, but swim about on their backs at the surface, with part of the yolk-sac out of the water.

Amateur Fish Culture Charles Edward Walker

When hatched out and kept in water containing a very large quantity of air in solution, I found that sometimes alevins developed an air bubble in the yolk-sac.

Amateur Fish Culture Charles Edward Walker