. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Fig. 100. Spearmouth {Life sice) The body is thicker and the mandibles are shorter. From the aquaristsstandpoint both these larvae could be classed as one. The Spearmouth isthe larva of the large Water Scavenger Beetle (Hydrophilus). Dragon-Fly Larvae. Almost everyone who raises fish outdoors isfamiliar with these unpleasant individuals. There are two reasons whythey are difficult to altogether avoid. When newly hatched they are verysmall and will go through the same strainer as daphnia; furthe
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Fig. 100. Spearmouth {Life sice) The body is thicker and the mandibles are shorter. From the aquaristsstandpoint both these larvae could be classed as one. The Spearmouth isthe larva of the large Water Scavenger Beetle (Hydrophilus). Dragon-Fly Larvae. Almost everyone who raises fish outdoors isfamiliar with these unpleasant individuals. There are two reasons whythey are difficult to altogether avoid. When newly hatched they are verysmall and will go through the same strainer as daphnia; furthermore the. Figs. 101 .and 102. Xvmph of Fly and Larva Catching Young Fish(Life sise) mother Dra£;:on Fly (Odonata) is an excellent flier and may deposit hereggs in any body of water that provides proper facilities for her larvae live more by their cunning than by any agility as on a dirty pond-bottom or attached to sticks, aquatic grass orother object they mark time until a victim comes within close they quickly pounce forward, extending a vicious, pincer-likeorgan called the mask, rarely missing the object of attack. The methodof propulsion through the water is peculiar, being brought about by aseries of expulsions of water from the hinder end. This enables them to 158 GOLDFISH VAEIETIES A^D make a very sudden leap towards a victim. The mask shown in Figure102 when not in use is folded before and under the head. Dragon Flylarvae are strictly carnivorous at all periods and will attack any pondcreature reasonably near its own size. If given enough
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