. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 362 JAMES M. MOULTON Differentiation of the "drumming membrane" is not apparent externally in the ocean triggerfish (Canthidcnnis sabaco Poey), nor does this species during handling move the pectoral fins to the drumming position. Similarly, the toothplate stridula- tion readily demonstrated by the queen and black triggerfishes (Table II; Figs. 5, 6) during handling out of water was not performed by the several ocean trigger- fish studied. While tooth stridulation and pectoral fin drumming were not heard from iso-
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 362 JAMES M. MOULTON Differentiation of the "drumming membrane" is not apparent externally in the ocean triggerfish (Canthidcnnis sabaco Poey), nor does this species during handling move the pectoral fins to the drumming position. Similarly, the toothplate stridula- tion readily demonstrated by the queen and black triggerfishes (Table II; Figs. 5, 6) during handling out of water was not performed by the several ocean trigger- fish studied. While tooth stridulation and pectoral fin drumming were not heard from iso- lated triggerfishes handled underwater, recordings made during the feeding about the hydrophone of a captive population of queen and black triggerfishes showed predominant intensities of accompanying sounds between .6 and kc. (Table II), which essentially spans the frequency ranges of predominant intensities obtained during tooth stridulation by these species in air. It was not possible to ascribe any specific sounds recorded at sea to triggerfishes, although their feeding activity probably contributed to background sounds recorded. They are common in the area studied. e- 7- 6- 5- 4- 3' 3 '. > i t . SECONDS. 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, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
