. Goldfish breeds and other aquarium fishes, their care and propagation : a guide to freshwater and marine aquaria, their fauna, flora and management. With 280 explanatory illustrations, printed with the text. ves to maintain the specific gravity and to change the centreof gravity of the fish and is enlarged or contracted by muscular action,whereby the air is expanded or compressed. When this bladder is rup-tured, malformed or diseased the fish loses all power of changing its posi-tion except in limited motion over the bottom of the tank, or is helplesson the surface of the water. The reproduc
. Goldfish breeds and other aquarium fishes, their care and propagation : a guide to freshwater and marine aquaria, their fauna, flora and management. With 280 explanatory illustrations, printed with the text. ves to maintain the specific gravity and to change the centreof gravity of the fish and is enlarged or contracted by muscular action,whereby the air is expanded or compressed. When this bladder is rup-tured, malformed or diseased the fish loses all power of changing its posi-tion except in limited motion over the bottom of the tank, or is helplesson the surface of the water. The reproductive system of the goldfish is oviparous, the ovaries ofthe female being known as the roe and the testes of the male as the he ovaries are placed below the spinal column on each side of the swim-ming bladder and posteriorly united with a Fallopian tube or oviduct whichleads to an opening behind the anus. The milt of the male are similarlylocated, and contain a thick white fluid in which are the spermatozoa. Theeggs or spawn when laid, are slightly compressed globules, about the sizeof the head ofa pin, of semi-transparent, white or yellowish color. Fecunda- 18 HISTORY AND ANATOMY OF THE GOLDFISH. FIG. 5—Diagram of the Blood circulatory systems of Fishes, Reptiles and Mammals. No. I—Diagram ofa fish tion takes place after the eggs are discharged, their outline then assuminga more spherical form, whereby the spermatozoa are drawn into the ovathrough minute orifices and the egg fertilized. The circulation of the blood is induced by a branchial or respiratoryheart consisting of two cavities, an auricle and a ventricle. Fig. 5. Thevenous blood, coming from the liver and the body generally, is taken through the vena cava into the auricle and pro-pelled into the ventricle, from which arises anaortic arch, dilated at the base into a cavity, thebulbus arteriosus, which has transverse rows ofvalves, and is covered with muscular fibres forrhythmical contraction. The blood is dr
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectaquariu, bookyear1908
