연어, Oncorhynchus keta 전기자어의 부화 직후부터 부상기 이전까지의 난황흡수과정 및 체성장의 형태가 조사되었다. 한국 동해안 남대천에서 채포된 암수 친어로부터 채취한 알과 정자를 사용하여 인공수정을 시켰다 사육수온은 $13^{circ}C$로 조절되었다. 부화 직후와 부화 후 12일부터 부화 후 33일까지 3일 간격으로 매회 40마리의 난황자어가 임의로 표본되었다. 부화 직후 난황자어의 평균 전장 및 평균 전중은 각각 1.97cm, 1.859이었으며 난황흡수는 부화 후 33일에 거의 이루어졌다. 전장, 전중 및 체세포 중량의 성장곡선은 Gompertz의 성장모델에 잘 적합되었다. 그러나 난황장, 난황중, 난황고 및 난황부피는 난황흡수가 완전히 이루어지기까지 선형의 감소경향을 나타내었다. 아울러 전장과 전중 혹은 전중과 난황중 등의 상관관계를 나타내는 상대성장도 역시 조사되었다.
The process of yolk absorption and the growth pattern of churn salmon, Oncorhynchus keta alevin were studied. Matured males and females of chum salmon were sampled from the Namdaechun River in the east coast of Korea, and then an artificial fertilization was carried out using their eggs and sperms. Fertilized eggs were incubated in controlled water temperature of $13^{circ}C$ and samples of 40 alevins were randomly taken at just hatching and at every three days between 12 days alter hatching and yolk absorption. The means of total length and total weight of hatched alevins were respectively 1.97cm and 1.85g and the yolk absorption took about 33 days after hatching, based on the morphological measurement. Growth curves of total length, total weight and somatic weight were fitted well with the Gompertz growth model. However, the shrinking in yolk-sac length, yolk-sac weight, yolk-sac height and yolk-sac volume revealed a linear phenomenon until the absorption of yolk was completed. The relative growth of chum salmon alevin, such as the relationship between total length and total weight, or between total weight and yolk-sac weight, was also studied.
