. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MARINE HALFBEAK REPRODUCTION 63 0) CL. D H balao, n-65 I H brasiliensis, n=522 Oocyte Diameter (mm) Figure 5. Oocyte diameter frequencies for Hemimmfilws brasiliensis (ballyhoo) (A-C) and H. balao (balao) (D). in the final stages of oocyte maturation. The largest mode in each figure represents a developing batch of oocytes in final oocyte maturation, whereas the smallest mode represents a reservoir of primary growth oocytes and vitellogenic oocytes prior to nucleus migration. A third,
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MARINE HALFBEAK REPRODUCTION 63 0) CL. D H balao, n-65 I H brasiliensis, n=522 Oocyte Diameter (mm) Figure 5. Oocyte diameter frequencies for Hemimmfilws brasiliensis (ballyhoo) (A-C) and H. balao (balao) (D). in the final stages of oocyte maturation. The largest mode in each figure represents a developing batch of oocytes in final oocyte maturation, whereas the smallest mode represents a reservoir of primary growth oocytes and vitellogenic oocytes prior to nucleus migration. A third, middle mode of oocytes represents a batch of oocytes just entering final oocyte maturation. Measurements were made from (Ala mature H. brasiliensis whose most advanced oocyte stage was nucleus migration, (B) a hydrated H. brasiliensis whose most advanced oocyte stage was nucleus breakdown. (C) a spawning H. brasiliensis with ovulated eggs, (D) a hydrated H. balao whose most advanced oocyte stage was nucleus breakdown. At least 300 oocytes were measured per female. those of Berkeley and Houde; for H. brasiliensis we found only three age-3 individuals and one age-4; for H. balao we found only a single age-2 individual. Sample sizes in both E 9 iuu • f 80- O 8 60- 0 'c 1 40" 1 20- n 0 • 1! 1 Fork length (mm) Figure 6. Percent frequency of mature (vitellogenic) female Hcmir- hrusilienxis (ballyhoo) and H. balao (bulao). Values are calculated by fork length intervals of 10 mm from fish collected during the peak spawning season (March-August), n = number of fish. studies were larger for H. brasiliensis because this species is more commonly caught and is found in a wider range of habitats than H. balao (McBride et al., 2003). At least one other hemiramphid, Reporhamphus inclainn'/iir, lives longer and grows larger (7 years, 380-mm FL; Ling, 1958). So even among hemiramphids, H. brasiliensis and H. balao are short-lived and grow to only modest lengths. Sizes of age-
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