. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. J 56 GOLDFISH VARIETIES A^T> INSECT ENEMIES OF FISHES Among the troubles that beset the fish culturists, not the least are caused by insects and their larvae. This applies both to the propagators of food fishes and those interested in fancy aquarium pets. We use the term "insect" here in its popular sense and not according to exact scien- tific definition. Some of these enemies are much more readily detected than others, but most of them may enter the rearing t
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. J 56 GOLDFISH VARIETIES A^T> INSECT ENEMIES OF FISHES Among the troubles that beset the fish culturists, not the least are caused by insects and their larvae. This applies both to the propagators of food fishes and those interested in fancy aquarium pets. We use the term "insect" here in its popular sense and not according to exact scien- tific definition. Some of these enemies are much more readily detected than others, but most of them may enter the rearing tanks when so small that detection is practically impossible. Wire screen or netting will keep out those that fly, or a large enemy in the water can be separated from daphnia or other living food by passing the "catch" through a fine wire gauze under water, but despite these precautions it is essential in the summer season to be ever on the lookout for any of the pests which may have gotten by our keenest observation. Fortunately for the aquarist there are not many kinds of insect enemies with which he is actively concerned. There are only four, three of these being larvje. While the others are none the less savage or fatal they are not so often met with, or else are so easily detected that they are not such serious factors with which to reckon. With the aid of illustrations made from specimens, mostly living, we will proceed to give descriptions of the four arch-enemies in the order of their destructiveness, and follow on with the others, adhering to the same plan as far as possible. Water Tiger. This is the larva of the Predaceous Diving Beetle (DyfiscHs), itself also a very powerful but easily detected enemy. The Water Tiger is easily the most rapacious, savage and insatiable enemy of. Fig. 99. W.\ter Tiger (Life si:r) young fishes. It does not wait for its prey to pass nearby, but adopts business-like methods of going after its unwary victims. The flat head is furn
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