Internet Core Protocols: The Definitive Guide

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The animals on the cover of Internet Core Protocols are trout. Trout belong to the family Salmonidae, one of the 435 families of Osteichthyes, the class of bony fish. Some species of trout, like their cousins the salmon, are anadromous. This means they systematically leave their freshwater, natal streams to feed in the ocean before expending most of their life’s energy swimming hundreds of miles back to spawn in the exact streams in which they hatched.

The trout in the upper left is a blueback char (Salvelinus alpinus). Most often referred to as arctic char, the sea-going variety is typically 2-8 pounds, with a deep blue-green back, brilliant silver sides, and occasional violet-pink spots. It is found farther north than any other freshwater fish. Circumpolar in distribution, arctic char roam marine environments off the coasts of Alaska, Canada, Greenland, Iceland, the U.K., and Scandinavia, eating zooplankton and small fish.

The fish on the lower right is the nOrth American brook trout (Salvelinus fontinalis, menaing spring char), a stream-dwelling, small (1-3 pound) trout indigenous to the streams around the Great Lakes. Its olive-green back is marked with dark wavy lines and its sides have pale yellow and red spots, creating camouflage ...