대구(Gadus macrocephalus)의 초기 발생시기의 비중변화
Changes in the Specific Gravity of Pacific Cod Gadus macrocephalus, During the Early Life Stages
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
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 specific 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.
Abstract
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 specific 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.
참고문헌 (21)
- Bian X, "Envelope surface ultrastructure and specific gravity of artificially fertilized Pacific cod Gadus macrocephaluseggs", J Fish Biol, 84, pp.403~421 (2014)[DOI]
- Chyung MK, "The fishes of Korea" (1977), Il Ji Sa Publishing Co.
- Coombs SH, "A density-gradient column for determining the specific gravity of fish eggs, with particular reference to eggs of the mackerel Scomber scombrus", Mar Biol, 63, pp.101~106 (1981)[DOI]
- Coombs SH, "Buoyancy measurements and vertical distribution of eggs of sardine (Sardina pilchardus) and anchovy (Engraulis encrasicolus)", Mar Biol, 145, pp.959~970 (2004)[DOI]
- Goarant A, "Anchovy (Engraulis encrasicolus) egg density measurements in the Bay of Biscay: evidence for the spatial variation in egg density with sea surface salinity", Mar Biol, 151, pp.1907~ (2007)[DOI]
- Hart JL, "Pacific fishes of Canada (Bulletin 180)", Fisheries Research Board of Canada, ~ (1973)
- Hurst TP, "Effects of ontogeny, temperature, and light on vertical movements of larval Pacific cod (Gadus macrocephalus)", Fish Oceanogr, 18, pp.301~311 (2009)[DOI]
- Kendall A, "Buoyancy of walleye pollock (Theragra chalcogramma) eggs in relation to water properties and movement in Shelikof Strait, Gulf of Alaska", Can J Fish Aquat Sci Spec Pub, 108, pp.169~180 (1989)
- Kim S, "Spawning behavior and early life history of walleye Pollock, Theragra chalcogramma, in Shelikof Strait, Gulf of Alaska, in relation to oceanographic factors", pp.1987
- Kim S, "Status of fishery and science of Bering Sea walleye pollock: (I) History and importance of fisheries", Ocean Res, 12, pp.117~128 (1990)
- Kim S, "Distribution and transport walleye pollock larvae in Shelikof Strait, Gulf of Alaska, in relation to water movement", Rapp P-v Cons int Explor Mer, 191, pp.127~136 (1989)
- Laurel BJ, "The ecological significance of lipid", fatty acid synthesis in developing eggs and newly hatched larvae of Pacific cod (Gadus microcephalus), 2010, pp.157, 1713~1724
- 이정용, "태평양 대구 Gadus macrocephalus 채란, 부화 및 자어사육에미치는 수온의 영향", 한국양식학회지, 20(4), pp.260~264 (2007), 한국양식학회
- Li Z, "Vertical position, specific gravity and swimming ability of Pacific cod Gadus macrocephalus yolk-sac larvae reared at four temperatures", Fish Sci, 81, pp.883~889 (2015)[DOI]
- Miller B, "Early life history of marine fishes" (2009), University of California Press
- Nishiyama, "The early life history and feeding habits of larval walleye pollock Theragra chalcogramma (Pallas) in the southeast Bering Sea", INPFC Bull, 45, pp.177~277 (1986)
- Petereit C, "The influence of different salinity conditions on egg buoyancy and development and yolk sac larval survival and morphometric traits of Baltic Sea sprat (Sprattus sprattus balticus Schneider)", Sci Mar, 73, pp.59~72 (2009)[DOI]
- Saborido-Rey F, "Buoyancy of Atlantic cod larvae in relation to developmental stage and maternal influences", J Plank Res, 25, pp.291~307 (2003)[DOI]
- 서영석, "한국 동해계군 대구 (Gadus macrocephalus)의 난발생과 자치어의 성장", 한국수산과학회지, 40(6), pp.380~386 (2007), 한국수산과학회
- Sundby S, "Turbulence and ichthyoplankton: influence on vertical distributions and encounter rates", Sci Mar, 61, pp.159~176 (1997)
- Woolley LD, "Ontogeny of body density and the swimbladder in yellowtail kingfish Seriola lalandi larvae", J Fish Bio, 82, pp.658~670 (2013)[DOI]