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Exotic Catfish (Aspredo), which "nurses" its eggs
Black Sole (Synaptura nigra)
This fish is one of those which reproduce by means of pelagic or floating eggs
Taking eggs from sockeye salmon, Afognak Hatchery
Herring and their spawn. Note that the eggs were deposited on branches that had fallen into the water
Fig.15.--Ciliated gastrula, ten hours after fecundation. The embryo Can now swim through the water by means of hairlike cilia. The larger cells have become invaginated.
Fig.16.--Trochosphere stage, twelve to fourteen hours after fecundation. The body has elongated and the cilia are now confined to the front end. The opening of the primitive mouth (pm) cn be seen on the lower side, while above is a slight indentation corresponding to the eginning of the shell gland (sg).
Fig.17.--Formation of the shell, which arises at two symmetrical points of calcification, right and left of the median line, and gradually envelops the animal.
Fig.18.--Early veliger swimmer with velum extended from the shell, about thirty-six hours after fecundation. aa, anterior adductor muscle, pa, posterior adductor muscle, s, stomach, a, anus, mt, mouth, v, velum.
Fig.19.--Veliger slightly older than shown in Fig.18. The intesting (i) has elongated, and the liver (l) is more prominent.
Fig.1.--Mature egg ready for union with male cell.
Fig.2.--Spermatozoa (male cells). Note length of tail and shape of head. No attempts were made to study the minute anatomy.
Fig.3.--Egg, twenty-five minutes after fecundation, showing the two polar cells (pc) and the faintly developed yolk love.
Fig.4.--Egg just previous to the first cleavage, showing large yolk lobe.
Fig.5.--The two-celled stage at the completion of the first cleavage, fifty minutes after fecundation. The larger cell contains the yolk lobe.
Figs. 6,7,8,9.--This series illustrates the process of cleavage in the egg during the change from the two-celled to the four-celled stage.
Fig.10.--The four-celled stage, one hundred and ten munites after fecundation. Side view.
Figs. 11,12.--The eight-celled stage, one hundred and forty-five minutes after fecundation.
Fig.13.--The sixteen-celled stae, one hundred and eighty-five munites after fecundation. Side view.
Fall Web Worm and Spiny Elm Caterpillar: FAll Web Worm (Hyphantria cunea Drury): 1. Cluster of eggs; 2. Dorsal views of full and partly grown larvae and also a lateral view of a full grown caterpillar; 3. Pupa; 4. Pupa; 5. White form of moth in resting position; 6. Spotted form of moth with wings expanded. Examples 2,5, and 6 are on a small web showing within the partly skeletonized discolored leaves and the frass or excrement of the caterpillars.
Spiny Elm Caterpillar (Euvanessa antiopa Linn.): 7. Cluster of eggs on a leaf stem; 8. One egg; 9. Caterpillar feeding; 10. Chrysalis hanging from a leaf stem; 11. Butterfly with wings spread, natural size. The figues of the egg and caterpillar are on a twig of elm representing the characteristic work of the caterpillar
This Picture Shows how Salmon Eggs are Secured and Fertilized in a State Hatchery
With the exception of the steelhead, all salmon die aftger depositing their spawn, so the females are killed before the eggs are taken from them, thus diminishing the egg loss. Scene at Chehalis Salmon Hatchery
Stages in the life-history of Haemocera danae, one of the Monstrillidae
A, Free-swimming nauplius larva; B, embryo after penetrating into the body of the worm Salmacina; C, D, E, successive stages in the body of the host; F, free-swimming adult female; a', Antennule; br, brain; e, nauplius eye; f, swimming feet; g.s., hairs on which the eggs are carried; m, position of mouth; md, hooked mandible of nauplius; n, nerve cord; ov, mass of eggs carried by female; ovy, ovary; pr, absorptive processes
Spawntaking operations, Baird, Cal. The fish (chinook salmon) are dipped from the pen, killed by a blow on the head, and passed to the spawntakers. The eggs are taken by opening the abdomen, and the stream of eggs may be seen in the picture following the hand making the incision
Shipping pike perch eggs, Oneida Harchery, Constantia, N. Y.
Pike Perch eggs in jars, Oneida Hatchery, Constantia, N. Y.
Stirring pike perch eggs, Constantia, N. Y.
Taking Pike Perch Eggs. Constantia, 1912
Pike Perch Eggs in Jars. Constantia, 1912
Taking Maskalonge Eggs, Chautauqua Lake
Head of Fifteen-spined Stickleback (A)
Egg of ditto magnified (B)
Seining Crew Washing Eggs
Eggs of the Cat-Fish
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