Silver trout

Salvelinus agassizi

Salvelinus agassizi ( English common name: Silver trout or trout Pond Dublin ) is an extinct genus of freshwater fish species from the char. The occurrence was limited to two waters in the U.S. state of New Hampshire. The specific epithet honors the zoologist Louis Agassiz.

Features

Salvelinus agassizi usually weighed 1.4 to 2.3 kg. However, there are also individuals have been caught that reached a weight of 3.2 kilograms. In the male the upper surface was dark gray-green, the lateral line organ was the color brighter and more yellowish. The bottom was yellow to pale pearl gray with a bright red saturn approach. Throat and lower abdomen were pure white. Stump orange - yellow points and five pale purple eggspots with purple centers were scattered throughout the midsection. The head was bright olive green with numerous metallic shimmering pink, pearly, yellow, purple or reddish tones. The lower jaw was whitish with dark speckles and a little flesh-colored or dull - orange toned top. The iris was golden. The dorsal fin was crisscrossed dull yellow with irregular dark cross bars. The fin rays were dull violet and a little lighter on the top edge with a narrow dark line. The pectoral fins, pelvic fins and anal fins were the bright purple - pink.

Extinction

The decline of Salvelinus agassizi began in the late 19th century, when the stocks were overfished in the spring and autumn. The dramatic collapse of the population was, however, have been exposed as faunenfremde fish species such as Atlantic salmon, rainbow trout, the American lake trout, king salmon, the catfish, the Arctic Norway, the yellow perch and the American striped bass in Dublin Pond and Christine Lake. They placed the char gradually decimated the breeding and the eggs. In addition, both the Dublin Pond and the Lake Christine used for the breeding of brook trout and creek were artic charr, which led to a hybridization between Salvelinus agassizi and Salvelinus fontanalis. The final proof in Christine Lake was 1926. Dublin Pond In 1930, the last six specimens were caught. In 1939, the species was declared extinct.

System

Salvelinus agassizi was discovered in 1849, but only in 1885 by Samuel Garman described scientifically as Salmo agassizii. In 1885 he was ranked by David Starr Jordan and 1914 by William Converse Kendall as a subspecies of Bach artic charr ( Salvelinus fontinalis ). In a comparison between Salvelinus agassizi and Salvelinus fontinalis, who had been the American ichthyologist Robert John Behnke from the Museum of Comparative Zoology at Harvard University in 1972 carried out, however, he recognized differences in morphology and coloration between the two taxa, leading to a reclassification led by Salvelinus agassizi as a species.