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Many small creatures such as caddis-worms will eat the ova, and therefore a careful watch should be kept upon the hatching trays as it is marvellous how such creatures find their way in, in spite of all precautions. Birds of several kinds are also likely to cause great damage unless the ova and young fish are carefully guarded from their depredations.
His grandmother having now been dead a year and a quarter, his mourning had been discarded, and his mother had been very impressive in her cautions to him not to spoil his new clothes, but before he had been staying with his young friends a fortnight he was much damaged in his outer man, as indeed he was also in his youthful heart, for the smallest of all the Mortimers a lovely little child about three years old took entire possession of it; and when he was not up a tree with the boys in a daring hunt after bergamy pears, or wading barefoot in a shallow stream at the bottom of the garden catching water-beetles, caddis-worms, and other small cattle for a freshwater aquarium, he was generally carrying this child about the garden pickaback, or otherwise obeying her little behests, and assuring her of his unalterable love.
For the brook, wherewith he had been familiar from his callow childhood, and wherein he was wont to quest for water-newts, and tadpoles, and caddis-worms, and other game, this brook, which afforded him very often scanty space to dabble in, and sometimes starved the cresses, was now coming down in a great brown flood, as if the banks never belonged to it.
The caddis-worms kill the ova by making a small hole in them and sucking some of the contents out; from this hole some more of the contents escapes, and as it comes into contact with the water becomes opaque. Caddis-worms are the larvæ of an order of four-winged flies commonly known as sedges, caddis-flies, or water-moths.
They frequent, exclusively, mountain torrents in the northern hemisphere, and obtain their food entirely in the water, consisting, as it does, of water-beetles, caddis-worms, and other insect-larvae, as well as numerous small fresh-water shells.
When he thought of it Dan felt as if he could not wait, but must burst that narrow cell and fly away, as the caddis-worms he used to watch by the brookside shed their stony coffins, to climb the ferns and soar into the sky.
For the brook, wherewith he had been familiar from his callow childhood, and wherein he was wont to quest for water-newts, and tadpoles, and caddis-worms, and other game, this brook, which afforded him very often scanty space to dabble in, and sometimes starved the cresses, was now coming down in a great brown flood, as if the banks never belonged to it.
'One thing is certain, that I have had numerous opportunities of seeing these shafts, these out-works of the Tarantula's abode; they remind me, on a larger scale, of the tubes of certain Caddis-worms.
Besides birds, small larvæ of several insects will eat, or at any rate kill, the ova in considerable numbers. Caddis-worms are among these larvæ which eat ova. This seems to be one of the few cases in which nature is just, for caddis-worms are taken very readily by even small trout. Large trout will take them very greedily, cases and all.
There are many furrows in the sand where some creature has travelled about and doubled on its tracks; and, for wrecks, it is strewn with the cases of caddis-worms made of minute grains of white quartz. Perhaps these have creased it, for you find some of their cases in the furrows, though they are deep and broad for them to make.
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