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By Peter B. Moyle

Engagingly written, with either studying and humor, Fish bridges the distance among in simple terms pictorial books and scholarly texts, and gives a succinct precis of fish biology and conservation for college kids and fish fans.

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They have considerable potential to damage natural ecosystems and can escape even from seemingly isolated ponds through such mechanisms as theft and unexpected floods. Â < previous page < previous page page_161 page_162 next page > next page > Page 162 Ornamental Ponds The typical ornamental pond is small and cement lined, with a filtered water supply and ornamental lilies and reeds growing from submerged containers. The chief fishes in such ponds are goldfish and koi carp, which are brightly colored, hardy, and omnivorous.

The problem with total length is that it is quite variable because tail shapes vary and tail tips are often frayed or worn. Fork length, the distance from the inside fork of the tail to the snout, is more reliable and is widely used by fisheries biologists because it can be measured rapidly.  Kokanee, which depend on zooplankton, are now less abundant in the lake and much smaller in size; presumably the same is true for the pectinifer tui chub as well. The lake trout now feeds mainly (64%) on shrimp and less on other fishes.

32 33 In contrast, the streams of western North America contain many fewer species. Because the major drainages are isolated from each other by mountain ranges, the number of endemic species (those confined to single drainages) is high and often adjacent drainages will share few species. For example, the SacramentoSan Joaquin drainage (California) on the west side of the Sierra Nevada shares only one native species (speckled dace) with the drainages of the Great Basin on the east side. A high percentage of the species are large as adults and are long-lived.

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