. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SESARMA LARVAL RELEASE RHYTHM 319 S haematocheir S intermedium. FIGURE 4. Survival of zoeae in fresh water. The ordinate indicates time after the release of zoeae. tides, and demonstrated that spring-tide currents would help ensure up-estuary transport toward suitable adult habitats. Zucker (1978) suggested that the same might be true for the three tropical Uca species, though their courtship activities are displaced a week, from the neap-tide to the spring-tide period. According to Baba and Miyata (1971), larvae of S. dehaa
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SESARMA LARVAL RELEASE RHYTHM 319 S haematocheir S intermedium. FIGURE 4. Survival of zoeae in fresh water. The ordinate indicates time after the release of zoeae. tides, and demonstrated that spring-tide currents would help ensure up-estuary transport toward suitable adult habitats. Zucker (1978) suggested that the same might be true for the three tropical Uca species, though their courtship activities are displaced a week, from the neap-tide to the spring-tide period. According to Baba and Miyata (1971), larvae of S. dehaani took at least 22 days to become young crabs, passing through four zoea and one megalopa stages. Hashimoto (1968) reported megalops of these three species in river mouths from July to October. This suggests that larvae of S. haematocheir and S. intermedium return to the river mouth about 1 month after they are released into the river. Megalops which return to the river mouth around spring tides would be able to swim to the most distant riverside from the sea with the rising tide. This might expand adult habitats. Zoeae also are released in brackish and sea water (Saigusa, in preparation), by females inhabiting hillsides where there is no suitable river. According to Hash- imoto (1965), in a few cases 5". haematocheir females release their larvae into tributaries whose water level is not influenced by tides. In such cases, the semilunar rhythm of larval release may have no adaptive significance. However, a large num-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole,
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