Effect of polyethylene package on the metmyoglobin reductase activity and color of tuna muscle during low temperature storage   总被引：2，自引：1，他引：1  

C HING-Y UNG  PONG  T ZE-K UEI  CHIOU  M ING-L ANG  HO  S HANN-T ZONG  JIANG 《Fisheries Science》2000,66(2):384-389

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Purification and characterization of metmyoglobin reductase from ordinary muscle of blue-fin tuna   总被引：1，自引：0，他引：1  

Ching-Yung Pong  Tze-Kuei Chiou  Fang-Pei Nieh and  Shann-Tzong Jiang 《Fisheries Science》2000,66(3):599-604

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Non-destructive determination of the fat content in glazed bigeye tuna by portable near infrared spectrophotometer     

Junji  SHIMAMOTO  Kaoru  HASEGAWA  Seigo  HATTORI  Yukio  HATTORI  Toshihiro  MIZUNO 《Fisheries Science》2003,69(6):1247-1256

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深冷型远洋金枪鱼延绳钓船的技术经济分析     

陈庆义  贾复  朱瑞源  陈龙 《大连水产学院学报》2003,18(1):29-33

在掌握大量相关资料的基础上，用系统分析的方法，对深冷型远洋金枪鱼延绳钓船的技术经济特征进行了分析，首先建立目标函数的数学模型，并对该数学模型的特性进行分析。在此基础上，采用SA算法（模拟退火算法）与单纯形加速法相结合的方式，在单目标下对最优船型进行了论证，并对最优船型参数的稳定性予以分析。其结论可供船舶选型时参考。  相似文献   

Whole-body heat transfer coefficient and body temperature change of juvenile Pacific bluefin tuna <Emphasis Type="Italic">Thunnus orientalis</Emphasis> according to growth     

Toshihiko Kubo  Wataru Sakamoto  Osamu Murata  Hidemi Kumai 《Fisheries Science》2008,74(5):995-1004

Bluefin tuna maintain a higher body temperature than ambient sea water. Body heat is derived mainly from metabolic heat to elevate and maintain regional body temperature that is higher than the ambient, while heat loss is caused by heat transfer throughout the whole body surface and gills. Retention of high body temperature is thought to differ at each growth stage, so that a larger body mass maintains a higher body temperature. We evaluated the whole-body heat transfer coefficient, thermal difference between each tissue and water temperature, and metabolic heat in tissues during swimming of juvenile bluefin tuna as a function of fork length (FL) using a small thermometer and a treadmill-type flow tank. A system for maintaining high body temperature was well developed in fish with FL greater than 20.0 cm. Whole-body heat transfer coefficient was fitted to a −0.695 power of mass. Juvenile bluefin tuna showed a transition speed of 3.0 FL/s at which they switched from aerobic to anaerobic motion.  相似文献   

东太平洋大眼金枪鱼自由鱼群栖息地偏好的时空分布特征     

黄金玲  戴黎斌  王学昉  周成  唐浩 《上海海洋大学学报》2020,29(6):889-898

摘 要：本研究基于美洲间热带金枪鱼委员会收集的2015-2017年东太平洋金枪鱼围网金枪鱼自由鱼群捕捞数据和相匹配的卫星遥感数据，使用二阶提升回归树模型(Boosted regression trees, BRTs)建立了该鱼群的栖息地，以探究其时空分布特征。研究结果表明，相对于环境因子，空间因子对大眼金枪鱼自由鱼群的丰度有更大的影响。环境因子方面，纬度、经度、混合层深度、月份和海表面温度是影响大眼金枪鱼捕捞成功概率的主要影响因子，而影响丰度的主要因子为经度和海表面叶绿素浓度。空间上，大眼金枪鱼主要处于10°S以南， 95°W以西的海域。在2016年7-9月和2017年2-4月中，BRTs模型预测的空间分布显示一些高度密集的自由鱼群分别栖息在远离海岸，经度为150°W，纬度为0°的赤道海域和经度为120°W，纬度为10°S附近的海域。时间序列上，大眼金枪鱼丰度月平均值的年际间变化差异很小，月间差异较大，在7月达到最高值，但在8月份立刻下降到最低值。本研究的结果可以为东太平洋大眼金枪鱼的资源养护和管理提供参考依据。  相似文献   

The cause of death of juvenile Pacific bluefin tuna (Thunnus orientalis) reared in sea net cages     

《Aquacultural Engineering》2014

Although the survival rate of juvenile Pacific bluefin tuna Thunnus orientalis (PBT) during 30 days after stocking in sea net cages has been as low as approximately 50%, the reason for this high mortality is not clear. The dead fish were collected and counted during 30 days after stocking in a sea net cage, and the growth performance, stomach contents, and bone injury were investigated. Nearly half (47.9%) had died within the first 4 days. The total length and body weight of the dead fish were significantly smaller than those of the live fish, and the weight of the dead fish did not increase during the first 7 days. Approximately one-third of the dead fish (21.9–42.9% per day) had ingested inorganic matter such as wood or Styrofoam waste during the first 7 days, and 25.0–45.0% of the dead fish sampled per day showed poor growth. The daily ingestion rate of inorganic matter decreased dramatically from the eighth day, when the daily mortality rate decreased. The percentage of dead fish with bone injuries due to collision or contact was low (less than 15%). These results suggest that one of the causes of high mortality during several days after stocking in a sea cage was accidental ingestion of inorganic matter by juvenile PBT. Improvement in feeding method can increase the survival rate of juveniles in sea net cages.  相似文献   

Spatial variability of bigeye tuna habitat in the Pacific Ocean: Hindcast from a refined ecological niche model     

Cheng Zhou  Rong Wan  Jie Cao  Liuxiong Xu  Xuefang Wang  Jiangfeng Zhu 《Fisheries Oceanography》2021,30(1):23-37

Habitat distribution is critically informative for stock assessment, since incorporating its variabilities can have important implications for the estimation of stock biomass or the relative abundance index. A refined ecological niche model with habitat characteristic parameterization was developed to reconstitute a 3‐D ecological map of bigeye tuna in the Pacific Ocean. We determined the boundaries and hierarchies of oceanographic features and hydrological conditions at horizontal and vertical scales to define the habitat preference of bigeye tuna associated with their feeding and physiological requirements. Ecogeographic projections underlined the depth‐ and region‐specific habitat distribution of bigeye tuna, with noticeable dynamic variations in the response to climate variability. Depths from 300 to 400 m represented layers of the most productive habitat, which was widespread through the equatorial Pacific Ocean and extended to the north‐central Pacific Ocean. The proportion of high‐quality habitat size in the north Pacific had a strictly regular intra‐annual cycle with peaks during the winter. Climate variability appeared to disturb the balance of the regular fluctuations in habitat size in the equatorial Pacific. Habitat hotspots during an El Niño period were characterized by their expansion to the north of the Hawaiian islands, shrinkage in the west for the hotspot band north of the Equator, and an eastern shift for the band south of the Equator. This variability may be the consequence of the incorporated fluctuations of the oxygen minimum zones (OMZ), current systems, and stratification in the open ocean.  相似文献   

An argo‐based experiment providing near‐real‐time subsurface oceanic environmental information for fishery data     

Chun‐Ling Zhang  Zhen‐Feng Wang  Yu Liu 《Fisheries Oceanography》2021,30(1):85-98

A better understanding of the relationships between oceanic environments and fishing conditions could make the utilization of fish more efficient, profitable, and sustainable. The current lack of high‐precision subsurface seawater information has long been a constraint on fishery research. Using near‐real‐time Argo observations, this paper presents a new approach called gradient‐dependent optimal interpolation. This approach provides daily subsurface oceanic environmental information according to fishery dates and locations. An experiment was conducted in the western and central Pacific Ocean using yellowfin tuna (YFT) catch data in August 2017. The results of seawater temperature and salinity represented differences of less than ±0.5°C and ±0.05, respectively, according to verification of error analysis and truth‐finding comparisons. After applying the constructed temperature and salinity profiles, we described the relationship between subsurface information and yellowfin tuna catch distribution. Statistical analysis revealed that yellowfin tuna were more adapted to warmer and saltier seawater. At the near‐surface (<5 m), the most suitable temperature was 28–29°C, although yellowfin tuna can endure a temperature range from 11 to 12°C at a depth of 300 m. The corresponding upper boundary of the thermocline was approximately 75 m, with a mean strength of 0.074°C/m, and the most suitable salinity for yellowfin tuna was 34.5–36.0 at depths shallower than 300 m. These results indicated that the constructed subsurface information was very close to the true values and they had high spatial and temporal accuracy.  相似文献   

基于将大西洋蓝鳍金枪鱼列入CITES附录Ⅰ提案的国际渔业管理分析   总被引：1，自引：1，他引：0  

颜斐斐  唐建业 《上海海洋大学学报》2012,21(5):856-863

受国际市场对大西洋蓝鳍金枪鱼产品需求的驱动,非法、不报告、不管制捕捞和捕捞能力过剩等现象频频发生,造成该鱼类资源的数量持续下降。瑞典、摩纳哥先后向濒危野生动植物种国际贸易委员会提议将大西洋蓝鳍金枪鱼列入《濒危野生动植物种国际贸易公约》附录,禁止捕捞和国际贸易该鱼种,引起了广泛关注和激烈争论。为此,通过分析ICCAT对大西洋蓝鳍金枪鱼的管理、相关国家或地区组织的不同意见,研究该提案可能对国际渔业管理及我国带来的影响。一旦该鱼种列入CITES附录,可能导致更多商业开发的水生生物被提到CITES框架上来,从而影响世界渔业的管理格局。对此,中国应采取行动,积极参加国际组织会议,参与规则制定,反映中国关注问题与主张。而作为联合国海洋法公约和ICCAT的一员,我国也有义务与其他国家合作执行ICCAT的养护和管理措施,为提高履约能力,规范国内远洋企业的管理,如按照相关要求及时、准确报送数据等,从而配合国家履行国际义务。  相似文献