. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 278 S-M HSIAO ET AL O • O O • O O O O. 30 1 0 2028 10 20 30 1 0 20 30 1 0 20 30 1 0 20 30 10 20 30 1 0 20 30 10 20 30 Feb Mar Apr May Jun Jul Aug Sep Figure 5. Cyclic variations in daily egg counts offish groups A, B, and C. These groups were respectively obtained on 23 January, 24 April, and 26 April (marked by arrows). Spawning tanks holding each group were equipped with vertical screens as spawning substrates, with the exception of the tank for group A, which had a suspended screen cone as an extra substrate. Eggs collect
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 278 S-M HSIAO ET AL O • O O • O O O O. 30 1 0 2028 10 20 30 1 0 20 30 1 0 20 30 1 0 20 30 10 20 30 1 0 20 30 10 20 30 Feb Mar Apr May Jun Jul Aug Sep Figure 5. Cyclic variations in daily egg counts offish groups A, B, and C. These groups were respectively obtained on 23 January, 24 April, and 26 April (marked by arrows). Spawning tanks holding each group were equipped with vertical screens as spawning substrates, with the exception of the tank for group A, which had a suspended screen cone as an extra substrate. Eggs collected from group A at the vertical and suspended screens are indicated as Aa and Ab, respectively. A part of each data series is significantly (P < ) fitted by sine curves through nonlinear regressions with a calculated mean cycle period (MP) ± 95% confidence limits provided. Concurrent cycles of moonlight (full moon: unfilled circle; new moon: filled circle) and the predicted maximal daily high tide are indicated at the top of the figure for comparison. Vertical dotted lines mark the dates of full moons. and spawning again occurred at the following daytime high tide. During the two days in May, a similar pattern was observed, but spawning occurred at the nighttime high tide. In both the March and May observations, two or three developing follicle clutches could be dis- cerned over each two-day period. However, spawning occurred only at the higher of the two daily semi- diurnal tides, regardless of its daytime or nighttime appearance. Laboratory studies Scnuluiuir spawning Because the field data revealed a distinct annual reproductive cycle, fish collected from the. 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
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
