. Fresh-water aquaria: their construction, arrangement, and management, with full information as to the best water-plants and live stock to be kept, how and where to obtain them, and how to keep them in health. Aquariums. TSYtiux. 299 worm or small larva seemis immediately to succumb to the powers of tlie Hydra's sting, but a Cyclops or Daphnia will, with a few struggles, make some show of resistance, the shell, or carapace, of the tiny crustaceans in their case afEording a slight pro- tection against the effects of the captor's poison. While in confinement, the Hydrse may be fed upon such Bnt
. Fresh-water aquaria: their construction, arrangement, and management, with full information as to the best water-plants and live stock to be kept, how and where to obtain them, and how to keep them in health. Aquariums. TSYtiux. 299 worm or small larva seemis immediately to succumb to the powers of tlie Hydra's sting, but a Cyclops or Daphnia will, with a few struggles, make some show of resistance, the shell, or carapace, of the tiny crustaceans in their case afEording a slight pro- tection against the effects of the captor's poison. While in confinement, the Hydrse may be fed upon such Bntomostraca as the Cyclops and Daphnise, which may be bred in a separate vessel for the purpose. The polypes expel the indigestible parts of these small criistacea. Though the Hydrse very often kill more animals than they are able to eat, the dead bodies of the victims need not be removed from the water, for the Entomostraca, if present in the tank in amy numbers, will act the part of scavengers, and help. Fig. 170. Uyorm attached to a piece of Anacharis Plant. to keep the water pure. A clear and thin glass tumbler makes a very suitable little aquarium for the Hydrse, which of course should have no other companions than those they feed upon. They ought to be provided with some aquatic plant, to which they can aS&x themselves (Fig. 170) if they choose. A little duckweed, or a small spray of the water- thyme {Anacharis alsinastrum) will answer the purpose very well. The Hydrse, however, frequently fasten themselves to the sides of the aquarium, thus much facilitating the observa- tion of their habits. Hydrae increase both by gei-mination aiid by being hatched from eggs. The former manner of reproduction seems to be commoner than the latter. The budding takes place on any part of the creature's body except the tentacles. When a polype is about to produce. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability -
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaquariu, bookyear1890
