Ontogeny of osmoregulation in the estuarine ghost shrimp Callianassa jamaicense var. louisianensis Schmitt (Decapoda, Thalassinidea)

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During the abbreviated development of Callianassa jamaicense var. louisianensis Schmitt, both zoeal stages exhibit hyperosmotic regulation of hemolymph in media <800-900 mOsm and conform at higher salinities, a pattern similar to adults. Hyperosmotic regulatory ability is present at the time of hatching. (Na + K)-activated ATPase activity, commonly associated with salt-transporting tissues, increases from 7.8 ± 4.3 μmol Pi·h-1·g wet wt-1 (95 % CI, n = 7) at early stages of prehatch development to reach the highest levels at hatching (96.5 ± 10.6 μmol Pi·h-1·g wet wt-1, n = 21); thereafter, larval ATPase activity decreases and then stabilizes at 56.6 ± 12.4 μmol Pi·h-1·g wet wt-1 (n=21). AgNO3 stains potential sites for osmoregulation along the inside surface of the branchiostegite and adjacent body wall in the larvae by forming silver precipitates which are identified by energy dispersive X-ray analysis. TEM studies of these sites reveal a specialized epithelium with characteristics typical of salt-transporting tissue. Thus physiological, biochemical and morphological features present in these larvae reflect an early development of osmoregulatory ability. © 1986.

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Journal of Experimental Marine Biology and Ecology

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