. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 64 R. S. McBRlDE AND P. E. THURMAN 100 80 • 60 • 40 • c g '^ 20 20 110° o S. 80 • 60 ' 40 •. nd M A M J A S O N D FJ Immature Maturing I Mature I Regressed Figure 7. Seasonal reproductive cycles of (Al female Hemiramphus /'/•iiw/ (ballyhoo) and (B) female H. htiltio, (balao) based on histo- logical criteria for fish collected from July 1997 to October 199K. Values were calculated from mature tish sizes only (fork length S: 198 mm for H. and >160 mm for H. balao). Nd = no data. was mm. The modal size of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 64 R. S. McBRlDE AND P. E. THURMAN 100 80 • 60 • 40 • c g '^ 20 20 110° o S. 80 • 60 ' 40 •. nd M A M J A S O N D FJ Immature Maturing I Mature I Regressed Figure 7. Seasonal reproductive cycles of (Al female Hemiramphus /'/•iiw/ (ballyhoo) and (B) female H. htiltio, (balao) based on histo- logical criteria for fish collected from July 1997 to October 199K. Values were calculated from mature tish sizes only (fork length S: 198 mm for H. and >160 mm for H. balao). Nd = no data. was mm. The modal size of hydrated H. balao oocytes ( mm) was also very close to the size of the H. balao egg ( mm) illustrated by Rass (1972). These independent descriptions and illustrations of mature oocytes and eggs confirm that interspecific differences in egg sizes exist for these two congeners. Sizes at maturity for both species were smaller than sizes attained by the first winter, and we agree with Berkeley and Houde (1978) that both species mature in their first year. In our study, the size at 50% maturity was of the maximum body size for H. brasiliensis (313 mm FL) and for H. balao (273 mm FL; McBride et al., 1996). To our knowledge, no study of hemiramphids has determined size at maturity with the precision that we achieved here, but other studies have reported the size of the smallest females with hydrated oocytes. Size at maturity in these other spe- cies is maximum body length for Hyporhamphas iiiclanochir (Ling, 1958), for Hemiramphus liinhntiix (Silva and Davies. 1988). and for Zenarchoincnts kampcni (Coates and Van Zwieten, 1992). Size at maturity is very close to 60% maximum body size for a number of hemiramphids, and this percentage value may be useful for predicting the size at maturity of hemiramphid that have not been studied. Both H. hrasiliensis and H. halao spawn frequently, even daily, for at least a few months of the year. Alth
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
