Title: Goldfish breeds and other aquarium fishes, their care and propagation; a guide to freshwater and marine aquaria, their fauna, flora and management
Identifier: cu31924001144652 (find matches)
Year: 1908 (1900s)
Authors: Wolf, Herman Theodore, 1855-
Subjects: Aquariums; Goldfish
Publisher: Philadelphia, Innes & Sons
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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THE PROPAGATION OF THE GOLDFISH Mating. The mating season of the goldfish is during the warm spring and summer months, when the water is at 60° or over, and spawn- ings occur at frequent intervals, as with this species of Cyprinidae all the FIG. 55. Embriology of the Goldfish. Newly exuded egg, not fecundated, wrin- kled and unexpanded surface covered with vesicles. Full and lateral views. Egg, four and ten hours after fecundation, showing germination and formation of membrane. Development of embrio and plasmic pro- cesses at edge of membrane, 24 and 34 hours after spawning. 4. Development of alevin and yolk-sac, 50 and 58 hours after spawning. 5, Free-swimming alevin attached to the yolk- sac, showing skeleton, partly developed digestive organs and surface colors. Four days old. 6. Alevin five days old; dorsal and caudal fins partly developed. 7. Alevin seven days old; pectoral and anal fins developed. The fully developed Telescope fry, ten days old.
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Greatly enlarged, i^ctual size, No. 8, ;- eggs do not mature at the same time. During this period the distinguish- ing characteristics of the male are developed and consist;of wartlike pro- tuberances or papillose tubercles on the operculse and main rays of the pec- toral fins, Fig.. 10 (page 46), which have distinct sexual purpose. Another 90

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