キンギョの鱗の成長に対する種々の飼料の効果

概要

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To investigate the effects of various diets on the circulus petterns of scales in goldfish (Carassius auratus L.) fed with diets of vaious compositions, 20 scales were taken at a definite area in each fish. The growth rate and specific growth rate of scale radii, augmentation of circulus number and circuli intervals were investigated.The low protein diets decreased the growth of body length, body weight and scale radii, and caused a slight absorption of scale, formation of extraordinarily thin fibrous layer, the irregular growth of radii, more decreased growth in the cranial than in the dorsal radii, more important effects on the growth of scales in younger than in older fish, and significant narrowing of circuli intervals which may form a scale ring.Although the high protein diets showed increased growth in the above measurements, the circuli interval was not spaced out nor was any particular pattern in scale found. KI added into water increased the growth of scale.High liver oil diets increased the growth of scales when CaCl2 and NaH2PO4 was added into water, but no particular findings in scale were obtained.
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