Samuel M. McGinnis, Doris Alcorn's Field Guide to Freshwater Fishes of California (Revised PDF

By Samuel M. McGinnis, Doris Alcorn

This renowned ebook is the one box consultant to all of California's one hundred thirty freshwater fish species, either local and brought. Revised and up-to-date all through, the consultant now positive factors the single entire selection of colour illustrations of California freshwater fishes on hand wherever. those colour illustrations, coupled with a collection of hugely targeted black-and-white drawings, supply a short and straightforward process for determining fish within the box. designated common heritage money owed for every species provide a wealth of knowledge, together with the present endangered or threatened prestige of many local species.

  • Includes angling advice for every recreation fish species
  • Features an elevated part on cooking freshwater fish

Illustrated by means of Doris Alcorn

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Read or Download Field Guide to Freshwater Fishes of California (Revised Edition) (California Natural History Guides, Volume 77) PDF

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Additional info for Field Guide to Freshwater Fishes of California (Revised Edition) (California Natural History Guides, Volume 77)

Example text

In a nonreproductive male, the testes appear as two small fingerlike structures in approximately the same area as the ovary in females. In a sexually mature male they are greatly enlarged and, like the mature ovary, may take up much of the body cavity. In a breeding male, a white liquid known as milt will probably pass out of the vent at the time of the ventral incision. This is a secretion of the walls of the sperm ducts, which contains and nourishes the sperm cells. The liver is the color of beef liver and is located anterior and ventral to the stomach (fig.

The section “Anatomy and Physiology of Freshwater Fishes”explains these relationships in more detail. Thermal and oxygen stratification disappear in late fall as lower solar input and greater reradiation to the atmosphere combine to cool the epilimnion. The change in density due to surface cooling produces eddy currents, which aid in carrying the surface water downward. At 4 degrees C (39 degrees F) the water completely mixes throughout the lake. Ice forms only at the surface because of added cooling from subfreezing air and surface evaporation.

In contrast, the physoclystic swim bladder appears as a silvery white roof on the body cavity and is not connected to the esophagus. Instead, a complex bed of capillaries, known as the rete mirabile, or gas gland, employs a countercurrent system to secrete gases from the blood (O2, N2, and CO2) into the bladder. In a reverse manner, excess gases are reabsorbed by another vascular bed, the oval, in the posterior portion of the bladder. This system enables deep-water or pelagic fishes to adjust their buoyancy at different depths without coming to the surface.

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