Catching performance of a mechanized pollock longline system compared with traditional one were examined in order to evaluate the practicality during two cruises in the Sokcho area. Mechanized longline system consists of random baiter, bait cutting machine, storage rails, and line hauler. Baiting efficiency of random baiter was 90-95% with 4-5kt shooting speed. Catching performance of the first experiment, salted sand lance only used as a bait. shows no significant difference between mechanized operation with use fresh sand lance as a bait caught significantly more pollock than traditional one with use salted sand lance (P<0.016). Improved catch rates were about 2 times. As soak time goes on, relative catching efficiency shows a steady increase up to 6~7 hours and thereafter gradually decrease.

For four calender years (1971-1974), daily observations of weather conditions (air temperature, humidity, wind speed, wind direction, cloud amount, fog, precipitation etc.) at six stations in the north western Pacific Ocean are used to calculate mean monthly values and to check extra-conditions. At Petropavlosk and Miko'skoe, where indicate the characteristics of modified continental climate, the temperature and humidity are high in summer, and Iow in winter. At A Dak and She Mya, where indicate the characteristics of warm current type maritime climate, humidity is high in all season and annual range of air temperature is nearly negligible. At Simusir and Vasi!' eva, where indicate the characteristics of cold current type maritime climate, humidity is high in all season and annual range of air temperature is 15℃. As dry cooling power is relatively high in winter, working condition on deck is bad. Most of fogs are advection fog in the area of cold current type climate in summer.

1977~76년에 부산수산대학의 오태산호를 사용하여 북서태평양의 소련 Kamchatka 반도와 Kurile열도 근해에서 해양 관측, 음향 측심 및 해류 조사를 실시한 자료를 해석하고, 해수유동과 해저지형과의 관련성 등에 관하여 검토하였다. Kamchaka 반도 동방의 대륙붕은 넓게 확장되어 그 폭은 약 75km에 달하고 그 경사는 완만하다(1~2。). 이 대륙붕은 Paramushir도 동방에서 폭이 좁아져서 약 36km가 되고 경사가 급해진다. Onekotan만 동쪽 약 20mile 해역에는 대륙붕이 조금 짤라져 해삼 모양의 솟은 곳이 있고, 그 단면은 평두해산과 비슷하다. Kurile열도 동방 Oyashio 해류 유역에서 직접 측류한 결과는 약 1kt로서 해류의 역학계산으로 얻은 유속 0.5~0.7kt 보다 조금 빨랐다. Oyashio 해류 동쪽 가장자리에는 강한 해류와 개속된 대소 규모의 좌선 및 우선 소용돌이가 줄지어 있다.

The catch per unit effort and the migration of Alaska pollack Theragra chalcogramma were deduced from the catch data of 1, 208 hauls of a stern trawler operated on and around the continental shelf east of the Kamchatka Peninsula and Kurile Islands from October 1974 to December 1975. Alaska pollack occupied more than ninety per cent of the total catch of approximately 17, 760 metric tons, while the cuttle and flat fishes occupied less than five percent. Beside those fishes, approximately 131 metric tons of Alaska pollack roe were produced during the voyage from February to April 1975. The mean catch per unit effort in each sub-area of fishing ground was approximately 15.5 metric tons and the peak of the CPUE occured in January and August. The CPUE in the continental shelf east of Kamchatka Peninsula (50˚- 52˚ N Lat) showed the maximum of 25-34 metric tons in August. The main fish school is thought to migrate southward speedily in August-September along the continental shelf from the Kamchatka Peninsula to the east of Kurile Islands. The CPUE on the continental shelf east of Kamchatka Peninsula was higher than that on the steeper continental slope. However, the CPUE on the steeper flank of the bank east of Paramushiru Island and Onekotan Island was remarkably higher than that on the relatively flat top of the bank. The small-sized fishes of less than thirty centimeter in fork length began to recruit in the fishing ground since August 1965.

Water temperature is one of the most important factors of fish survival, affecting the habitat, migration route, development, and reproduction. This experiment studied the induction level of heat shock protein (HSP70) mRNA and protein in a walleye pollock (Gadus chalcogrammus) primary hepatocyte culture based on different temperatures. Hepatocytes were attached at 7.5 °C for 24 hours. Hsp70 induction levels were then measured for 48 hours at 5, 8, 11, 14, and 17 °C. The induction level was lowest at 5 °C and generally increased with temperature until 14 °C. The induction level was reduced at 17 °C, indicating that 14 °C is the highest tolerable temperature for hepatocytes. These data indicate that primary hepatocyte cell culture is under no stress at 5 and 8 °C. Temperatures greater than 11 °C induce stress, showing similar induction patterns in both mRNA and protein in hepatocytes. The results suggest that 14 °C is the maximum internal defense temperature of walleye pollock survival.

명태를 로 잘라 절인배추의 무게 비로 6, 12, 18% 첨가한 김치를 제조한 후 에서 20일간 발효숙성시키면서 4일 간격으로 pH, 산도, 염도, 환원당, 젖산균의 변화, 색도, 아미노산, 관능 등 품질 특성의 변화를 관찰하였다. pH와 환원당은 발효가 진행될수록 전 실험군에서 낮아지는 경향을 보였으며 명태 첨가량이 높아질수록 pH와 환원당의 값이 높았다. 산도는 발효가 진행되어 갈수록 전체적으로 높아지는 변화를 보였는데 명태 첨가군이 높은

The antibiotic and antioxidant effect of botanical antimicrobial agent-citrus product(BAAC) prepared from citrus fruits were investigated by using fishmeats made from pollack and ascidian fillet. We inoculated Salmonella typhi into fishmeats that were aferwards treated with BAAC varying the concentration level (50-500ppm) including the control not-treated with BAAC. While specimens were stored at 5 for designated period, we measured changes of total number of bacteria, peroxide level and textural properties. In addition, we performed organoleptic examination, focusing on appearance, texture and odor for fishmeats treated with BAAC and stored for designated period. For pollack and ascidian fishmeats, the initial total number of bacteria were 3.7l0CFU/g and 7.5l0CFU/g, respectively. After they were treated with 250 ppm of BAAC solution and stored for 5 days at 5, the figures reduced to 2.5l0CFU/g and 8.410CFU/g. No bacteria were found in fishmeats treated with above 500 ppm of BAAC, which remarkably proved antibiotic effect of BAAC solution. Furthermore, all the BAAC-treated specimens exhibited notable antioxidant effect. Fishmeats which were previously treated with 500 ppm of BAAC solution and stored for 30 days at 5, showed the lower peroxide level of 16.5 meq/kg than 68.9 meq/kg in the control of pollack and 21.2 meq/kg than 80.7 meq/kg in the control of ascidian. In the results of texture and organoleptic evaluation we could also observe good effects of BAAC on maintaining the freshness of fisher products.