HAL.—I am surprised to hear a salmon fisher talk so: yet he _is_ too large to take a fly, and must be trolled for. We must spin a bleak for him, or small fish, as we do for the trout of the Thames or the salmon of the Tay. Ornither, you understand the arrangement of this kind of tackle—look out in my book the strongest set of spinning hooks you can find, and supply them with a bleak; and whilst I am changing the reel, I will give you all the information (which, I am sorry to say, is not much) that I have been able to collect respecting this fish from my own observation or the experience of others. The hucho is the most predatory fish of the salmo genus, and is made like an ill-fed trout, but longer and thicker. He has larger teeth, more spines in the pectoral fin, a thicker skin, a silvery belly, and dark spots only on the back and sides—I have never seen any on the fins. The ratio of his length to his girth is as 8 to 18, or, in well fed fish, as 9 to 20; and a fish, 18 inches long by 8 in girth, weighed 16,215 grains. Another, 2 feet long, 11 inches in girth, and 3 inches thick, weighed 4lbs. 2¼oz. Another, 26 inches long, weighed 5lbs. 5oz. Of the spines in the fins, the anal has 9, the caudal 20, the ventral 9, the dorsal 12, the pectoral 17: having numbered the spines in many, I give this as correct. The fleshy fin belonging to the genus is, I think, larger in this species than in any I have seen. Bloch, in his work on fishes, states that there are black spots on all the fins, with the exception of the anal, as a character of this fish: and Professor Wagner informs me he has seen huchos with this peculiarity; but, as I said before, I never saw any fish with spotted fins—yet I have examined those of the Danube, Save, Drave, Mur, and Izar: perhaps this is peculiar to some stream in Bavaria—yet the huchos in the collection at Munich have it not. The hucho is found in most rivers tributary to the Danube—in the Save and Laybach rivers always; yet the general opinion is, that they run from the Danube twice a year, in spring and autumn. I can answer for their migration in spring, having caught several in April, in streams connected with the Save and Laybach rivers, which had evidently come from the still dead water into the clear running streams, for they had the winter leech, or louse of the trout upon them: and I have seen them of all sizes, in April, in the market at Laybach, from six inches to two feet long; but they are found much larger, and reach 30, or even 40, pounds. It is the opinion of some naturalists, that it is _only_ a fresh water fish; yet this I doubt, because it is never found beyond certain falls—as in the Traun, the Drave, and the Save; and, there can be no doubt, comes into these rivers from the Danube; and probably, in its larger state, is a fish of the Black Sea. Yet it can winter in fresh water; and does not seem, like the salmon, obliged to haunt the sea, but falls back into the warmer waters