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Summary
Rectal glands from 8 striped dogfish (Poroderma africanum) were subjected to histochemical examination, incorporating the chloride test and histological staining with Alcian blue-Neutral red, Mallory's stain-Sudan IV and Phosphomolybdic acid orange-Sudan black. The chloride test was carried out on normal fish and ones which had been salt-loaded with interperitoneal NaCl injection. A general radial arrangement of secretory tubules was observed, although in the lower region of the glands the glandular parenchyma was divided into lobules by fibrous septa. The chloride test showed silver granules in the cells of the secretory epithelium, similar in nature to those observed previously (Haywood 1974a) in branchial tissue of the same species.