. Goldfish breeds and other aquarium fishes, their care and propagation; a guide to freshwater and marine aquaria, their fauna, flora and management. Aquariums; Goldfish. 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 fecund
. Goldfish breeds and other aquarium fishes, their care and propagation; a guide to freshwater and marine aquaria, their fauna, flora and management. Aquariums; Goldfish. 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 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, 10 (page 46), which have distinct sexual purpose. Another 90. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wolf, Herman Theodore, 1855-. Philadelphia, Innes & Sons
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectaquariu, bookyear1908
