@article {140,
	title = {Annual reproductive cycle of two Japanese species of sipunculans: Siphonosoma cumanense (Sipunculidae) and Phascolosoma scolops, Phascolosomatidae)},
	journal = {Pacific Science},
	volume = {48},
	number = {2},
	year = {1994},
	note = {ABST: ANN. REP. CYC. OF 2 SIPS, S.C. \& P.S. WERE STUDIED BASED ON SIZE, DENSITY \& FREQ. DIST. OF GAMATES FROM MAY 89 TO NOV. 90 AND OCT. 89 TO FEB 91 RESPECTIVELY. ALIQUOTS FROM THE TOTAL VOL. OF THE DILUTED COELOMIC FLIUD FROM EACH IND. WERE ANALYZED. COEL. OOCYTES OF S.C. SHOWED A SLOW GROWTH RATE, I.E. 3UM/MNTH FROM DEC > AP \& ACCELERATED RATE OBS. FROM MAY>JULY. NO OOCYTES WERE ENCOUNTERD FROM SEPT>DEC. SUGGESTING THAT SPAWNING OCCURS FRM JULY>AUG. SPERM CLUSTERS WERE ENCOUNTERD FRM MAY>AUG. W{\textquoteright} PEAKS IN JUNE \& JULY. IN CONTRAST OOCYTES \& SPRM CL. OF P.S. WERE PRESENT THRUOUT THE YEAR. FRM JAN>MAR SML OOCYTES GREW AT AN AVER. RT. OF 10UM/MONT. OOCYTES SHOWED RAPID GRTH TIL JULY. SMALLER OOCY TES NOTED THEREAFTER INDICATING SUMMER SPAWNING. FLUCTUATION OF SP.CL.. DENSITY SHOWED PATTERN SIMIL. TO OOCYTES. BOTH SPP SHOWED 2 MAJOR PEAKS IN GAMETES DENSITY, 1 DURING OOCYTE PROLIF. AND 1 BEFORE SPAWING. STAGES OF GAM{\textquoteright}GENESIS IN BOTH SPP ARE DESCRIBED. YAMAMOTO{\textquoteright}S ADDR. USHIMADO MAR. LAB. , OKAYAMA UNIV. USHIMADO, OKAYAMA, JAPAN},
	pages = {145-157},
	chapter = {145},
	keywords = {breeding cycle, reproduction},
	author = {Catalan, M. A. B. and Yamamoto, M.}
}
