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Histological changes of several organs during growth of the brook lamprey lampetra reissneri

Tsuneki, K.; Ouji, M.

Japanese Journal of Ichthyology 31(2): 167-180

1984

ISSN/ISBN: 0021-5090
Accession: 005579664
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The gonad, buccal cavity, gill, esophagus, salivary gland, intestine, liver, kidney, fat column and eye were studied histologically during growth of the brook lamprey, L. reissneri. Gonads of all individuals showed ovary-like structures at about 70-90 mm in total length. In females, oocytes continued to grow. In males, oocytes degenerated, and a tiny testis originated from a small number of residual undifferentiated germ cells. Upon histological observation, the sex was easily determined in individuals larger than 120 mm in total length. Initial tooth development (intraepidermal keratinization) occurred at stage 5 of metamorphosis. Esophagus of the adult type was distinguishable by stage 5. The salivary gland and its duct were also formed by stage 5. Intestine and kidney degenerated during metamorphosis. The liver of tubular gland type changed to the adult type by stage 3. In ammocoetes larvae, main hematopoietic tissues were located in intestine and kidney, but in adults they were found in the fat column.

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Related References

Tsuneki, K.; Ouji, M. 1984: Morphometric changes during growth of the brook lamprey lampetra reissneri Japanese Journal of Ichthyology 31(1): 38-46
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