50 Mr. J. J. Armistead [Feb. 14, 



tried a good many experiments on trout, I have found that nothing is 

 easier than to make trout run when you get an artificial spate at the 

 proper time and made in the proper way. 



In the case of sea fish there are some very important things to be 

 considered. First of all we have the sea to contend with. The fish 

 are coming up from the sea. Now we find that the anadromous or 

 sea-going fish run on flood tides, and we know that they enter the 

 river usually a little before high water, so that to let in the spate on 

 an ebb tide would be absolutely useless. Then, again, we find that 

 the wind has a great deal to do with the run of fish. On our 

 west coast, or on some of our west coast rivers, when we get a wind 

 from the westward we find, other things being equal, that the fish 

 will run very much better than with an east wind. They will often 

 hardly run at all with an east wind, even though other things may be 

 favourable ; so that the wind is an element which has to be con- 

 sidered. Barometrical conditions have also to be considered, and we 

 find that they play a very important part indeed in influencing the 

 movements of our fishes. Then we find, above all, that, although 

 the fish run upon a flood tide, on spring tides they run very much 

 better than they do on neap tides, when they often run very tardily ; 

 so that by takiug advantage of a knowledge of these facts and others, 

 we can let ofi" impounded water at a time when it will be likely to 

 bring them ; aud there is no doubt whatever that if the thing were 

 properly carried out it would be eminently successful. As regards 

 trout, a very moderate amount of water is sufficient to produce very 

 great results. I have seen a stream utilised which ran almost dry 

 in dry weather. The water of the stream has been made to produce 

 a large quantity of fish, as I have just described. 



Here we have such a stream (Fig. 8), but with a rocky bed 

 almost dry. The water retires into the pools in which the fish live 

 during the times of drought. On this stream we have a dam made to 

 run across, and raising the water some three feet above its natural level. 

 Here, where the man is sitting, is a sluice, and the water is allowed 

 to escape through this sluice, which regulates the supply, and it flows 

 away into the woods. It passes through a pine forest, and by 

 means of this aqueduct goes on. Here is another view of the same 

 aqueduct, and so it goes on flowing for a distance of about half a mile, 

 the country through which it passes being from many circumstances 

 unfavourable for the coustruction of ponds. That, however, is no 

 great difficulty. It is simply a case of taking the water a little 

 farther on until we get to a suitable place for the construction of the 

 ponds in which the fish must live. The spout or bridge is to conduct 

 the surface water or rain water over the aqueduct, and to prevent its 

 getting in in excess. The surface water, if allowed to get in in excess, 

 has a prejudicial effect, so we employ a large number of these little 

 bridges for the purpose of keeping it out. Little canals are dug in 

 various directions for conducting the water into these spouts. The 

 water passes on and flows into this pond here, and in this pond a 

 large number of fish have been produced. 



