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fish do not shed their scales when they grow as boss man says.. one thing I learned is when a fish loses its scales or a scale...the fish will not grow at all until the scale/scales are fully replaced or repaired ...this is because all of the fishes energy and nutrition go into regrowing the missing scales.ne thing I learned is when a fish loses its scales or a scale...the fish will not grow at all until the scale/scales are fully replaced or repaired ...this is because all of the fishes energy and nutrition go into regrowing the missing scales.
Scales serve to protect the body from the outside dangers such as predators and infection. Cosmoid scales Cosmoid scales are found in the Lungfish (family Ceratodidae) and some fossil fishes. Cosmoid scales are similar to placoid scales and likely evolved from the fusion of placoid scales.They consist of two basal layers of bone, a layer of dentinelayer of dentine--like cosmine, and an outer like cosmine, and an outer layer of vitrodentine. Placoid Scales Often referred to as denticles.cales serve to protect the body from the outside dangers such as predators and infection. Cosmoid scales Cosmoid scales are found in the Lungfish (family Ceratodidae) and some fossil fishes. Cosmoid scales are similar to placoid scales and likely evolved from the fusion of placoid scales.