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Ultrastructure of alarm substance cells in the epidermis of the channel catfish, Ictalurus punctatus (Rafinesque)
Author(s) -
Yoakim E. G.,
Grizzle J. M.
Publication year - 1982
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1982.tb03921.x
Subject(s) - ictalurus , catfish , biology , nucleoplasm , nucleus , organelle , cytoplasm , epidermis (zoology) , ultrastructure , nucleolus , golgi apparatus , microbiology and biotechnology , anatomy , fish <actinopterygii> , biophysics , fishery , endoplasmic reticulum
The cytoplasm of the alarm substance cells in the epidermis of an ostariophysian fish, channel catfish, contained fine homogeneously dispersed fibrillar material. Most cyto‐plasmic organelles were concentrated perinuclearly. The mitochondria were of the tubular type and had matrix granules 30‐50 nm in diameter. The saccules of the Golgi bodies did not form a parallel array and were comparatively widely separated. The nucleus was irregular in shape and had a distinct nucleolus made up of deeply stained granules meshed with areas of less granulation. The nuclear envelope was in the form of a double membrane having a wavy appearance and occasionally it showed invaginations penetrating deeply into the nucleoplasm. Lysosomes and lipid inclusions were encountered in the vicinity of the nucleus. Proteins were demonstrated histochemically, but carbohydrates were not detected. Differences between the alarm substance cells of channel catfish and those of other ostariophysian fish were described and discussed.