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A fish of "normal" weight has a relative weight of 100 percent. The relative weight of a fish does not indicate its health on a continuous scale from 0 -100%, however. For example, Simpkins et al. found that juvenile rainbow trout with a condition index of less than 80% were at a high risk of dying. [9] Relative weight is one of several common ...
A fish scale is a small rigid plate that grows out of the skin of a fish. The skin of most jawed fishes is covered with these protective scales, which can also provide effective camouflage through the use of reflection and colouration, as well as possible hydrodynamic advantages.
Aristotle (ca. 340 B.C.) may have been the first scientist to speculate on the use of hard parts of fishes to determine age, stating in Historica Animalium that “the age of a scaly fish may be told by the size and hardness of its scales.” [4] However, it was not until the development of the microscope that more detailed studies were performed on the structure of scales. [5]
The blue runner is distinguished from similar species by several morphological features, including the extent of the upper jaw, gill raker count and lateral line scale counts. The blue runner is known to reach a maximum length of 70 cm and 5.05 kg in weight, but is much more common below 35 cm.
The king mackerel is a medium-sized fish, typically encountered from 5 kg (11 lb) to 14 kg (30 lb), but is known to exceed 40 kg (90 lb). The entire body is covered with very small, hardly visible, loosely attached scales. The first (spiny) dorsal fin is entirely colorless and is normally folded back into a body groove, as are the pelvic fins.
When two fish with nacreous scales breed together, the offspring will on average include 1/4 with metallic scales, 1/4 with matte scales, and 1/2 with nacreous scales. If a fish with nacreous scales breeds with a fish with metallic scales, the offspring will on average include 1/2 metallic and 1/2 nacreous. If a fish with nacreous scales breeds ...
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