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논문 기본 정보

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학술저널
저자정보
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한국수산과학회 한국수산과학회지 한국수산과학회지 제51권 제3호
발행연도
2018.6
수록면
332 - 337 (6page)

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The Pacific cod Gadus macrocepahlus, lays demersal eggs and the hatching larvae rise toward the surface layer of the ocean to feed. The change in the specific gravity of eggs and larvae was investigated to examine their vertical distribution and movement in the water column. The specific gravities of fertilized eggs and various size classes of larvae were measured using a density gradient apparatus. In total, the instantaneous specific gravity of 146 eggs and 225 larvae were measured. To prevent any disturbance in the gradient water column due to larval movement, 0.004% MS222 was used for anesthesia. Due to their high specific gravity, eggs spawned were deposited over the sea-bed of the spawning ground. The specific gravity of hatching larvae decreased abruptly. However, Pacific cod larvae still had a comparatively high specific gravity at hatching (1.03655±0.00146 g/cm3, n=4, mean SL=3.62 mm) and their spe cific gravities tended to decrease as they grew. The specific gravity stabilized 6 days after hatching (1.02590±0.00212 g/cm3, n=15, mean SL=4.67 mm) and the cod larvae were eventually able to float in the water column.

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