New information on age composition and length–weight relationship of bluefin tuna, Thunnus thynnus, in the southwestern North Pacific     

Chien-Chung Hsu  Hsi-Chiang Liu  Chi-Lun Wu  Shih-Tsung Huang and  Hsueh-Keng Liao 《Fisheries Science》2000,66(3):485-493

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Movement and behaviour of large southern bluefin tuna (Thunnus maccoyii) in the Australian region determined using pop‐up satellite archival tags     

TOBY A. PATTERSON  KAREN EVANS  THOR I. CARTER  JOHN S. GUNN 《Fisheries Oceanography》2008,17(5):352-367

Pop‐up satellite archival tags (PSATs) were deployed on 52 large (156–200 cm length to caudal fork) southern bluefin tuna (Thunnus maccoyii) in the western Tasman Sea during the austral winters of 2001–2005. Southern bluefin tuna (SBT) were resident in the Tasman Sea for up to 6 months with movements away from the tagging area occurring at highly variable rates. The data indicated a general tendency for SBT to move south from the tagging area in the Western Tasman Sea. Four individuals migrated west along the southern continental margin of Australia and into the Indian Ocean. Three individuals moved east into the central Tasman Sea, with one individual reaching New Zealand. We also describe the first observed migration of an SBT from the Tasman Sea to the Indian Ocean spawning grounds south of Indonesia. Individuals spent most of their time relatively close to the Australian coast, with an estimated 84% of time spent in the Australian Fishing Zone. SBT favored temperatures between 19 and 21°C, adjusting their depth to the vertical temperature distribution. Distinct diurnal diving patterns were observed and adjustment of depth to maintain constant ambient light levels over a 24‐h period. The findings of this study are a significant advance toward greater understanding of the spatial dynamics of large SBT and understanding the connectivity between distant regions of their distribution.  相似文献   

热带东太平洋海域拟锥齿鲨的繁殖生物学特性   总被引：1，自引：0，他引：1  

刘维  戴小杰 《南方水产》2008,4(2):21-25

研究根据科学观察员在热带东太平洋海域2次调查,调查时间和海域分别为2003年7～11月的03°S～17°S,96°W～146°W范围,2006年2～11月的05°N～10°S,134°W～173°W范围。调查共测定了202尾拟锥齿鲨（Pseudocarcharias kamoharai）的样本,并对其进行分析。结果表明,拟锥齿鲨全长（TL）与全重（W）的关系,雌性是W=9×10^-5TL^2.3116,雄性是W=9×10^-6TL^2.9007。其雌雄性比接近1：1。雌性拟锥齿鲨的总性腺重量随体长增加而增加,增加幅度较大;雌性拟锥齿鲨性成熟的最小TL约为89cm,雄性大约在85～100cm。雌体怀仔数量平均为3.85尾。出生时的TL约为40cm左右。  相似文献   

鲣鱼蒸煮液美拉德反应优化及氨基酸分析     

陈启航  方旭波  陈小娥  池海波  余辉  田方  王坚强 《核农学报》2021,35(3):651-659

为了制备风味良好的鲣鱼调味基料,本试验以鲣鱼蒸煮液(STCL)为原料,在酶解和脱腥基础上,采用感官评价、电子鼻技术结合主成分分析(PCA)及线性判别分析(LDA),通过正交试验优化美拉德工艺,并对鲣鱼蒸煮液酶解液美拉德产物进行氨基酸组成成分分析和必需氨基酸营养评价。结果表明,电子鼻技术结合LDA优于PCA,更能客观地区分不同条件下鲣鱼蒸煮液酶解液美拉德反应产物的风味差异;鲣鱼蒸煮液酶解液美拉德反应最优工艺条件为:添加木糖-葡萄糖1:2,在110℃下加热45 min,在此条件下,美拉德产物鱼香味浓郁,色泽呈黄棕色,氨基酸总量为7.036 g·100g^-1,必需氨基酸含量为2.888 g·100g^-1,必需氨基酸指数(EAAI)为64.034,说明鲣鱼蒸者液美拉德反应产物营养价值较高,是研发海鲜调味料的理想基料。本研究结果为鲣鱼调味基料的开发提供了一定的理论依据。  相似文献   

3种不同脱水方式处理对金枪鱼碎肉挤压产物品质的影响比较     

刘建华  季金箭  张建友  丁玉庭 《核农学报》2016,(4):741-747

为了获得品质最佳的金枪鱼挤压产物,本试验以金枪鱼碎肉为原料,探讨了炒制、热泵干燥和真空干燥3种脱水方式对挤压产物品质的影响。结果表明,3种脱水方式对挤压产物的色差、膨化率、硬度和咀嚼度无显著影响。经炒制制得的挤压膨化产物,其组织化度最高,为1.62,蛋白质体外消化率最高、酸价最低,分别为84.41%和18.09 mg·g-1。而经热泵和真空干燥处理得到的挤压产物,其组织化度为0.97和1.03,蛋白质体外消化率为81.77%和78.42%,酸价为32.76 mg·g-1和26.36 mg·g-1。相比其他2种脱水方式,炒制脱水有利于提高金枪鱼碎肉挤压膨化产物的组织化度,保持蛋白质的营养价值,并降低产物中脂肪的氧化程度。本研究为金枪鱼碎肉的挤压膨化提供了一定的理论依据。  相似文献   

漂流人工集鱼装置随附鱼群中鲯鳅的生物学特征     

王学昉  许柳雄  唐浩  周成  朱国平 《上海海洋大学学报》2014,23(3):429-434

漂流人工集鱼装置(fish aggregation devices,FAD)在金枪鱼围网渔业中被广泛地应用于诱集捕捞金枪鱼类。鲯鳅作为漂流FAD诱集鱼群中最为常见的兼捕种类之一,研究其生物学特性有助于了解其种群结构,对于合理保护该资源具有重要意义。利用2010-2013年间中西太平洋金枪鱼围网渔业科学观察员在5°N~10°S,145°E~170°E海域内收集的189尾鲯鳅样本,对其叉长分布、性比、性成熟度及摄食等生物学特性进行研究。结果表明:鲯鳅叉长范围为10.0~126.3 cm,优势叉长为70.0~100.0 cm,占总数的66.7%;雌雄性别比为4.1∶1;样本以性成熟(Ⅴ~Ⅵ期)个体为主,占总数的73.6%,50%性成熟叉长(L50)为49.95 cm;76.0%的样本为空胃,而实胃中频现其它常见的小型随附鱼种,如鲣(Katsuwonus pelamis)的幼鱼、细鳞圆鲹(Decapterus macarellus)、六带鲹(Caranx sexfasciatus)、疣鳞鲀(Canthidermis maculata)和单角革鲀(Aluterus monoceros)。渔业生物学信息表明漂流FAD下的鲯鳅群体以性成熟的大型个体为主,FAD对于雌鱼具有更强的聚集效果,觅食是鲯鳅游向漂流物的可能动机之一。  相似文献   

中西太平洋金枪鱼围网渔业渔获组成及叉长与体重关系   总被引：1，自引：1，他引：1  

杨松  陈新军  许柳雄 《上海水产大学学报》2005,14(3):337-340

中西太平洋海区是世界金枪鱼围网作业的主要渔场之一[1]。目前从事生产的金枪鱼围网船约160艘[2]。据统计,2003年该海区的金枪鱼围网渔业总产量为117.28×104t,占其金枪鱼总产量的60%[3]。我国大陆地区金枪鱼围网渔业起步较晚,但发展较快,渔船已由2001年的1艘发展到2004年的8艘  相似文献   

马铃薯曲面式播种开沟器仿生设计与试验     

赵淑红  顾志远  袁溢文  吕金庆 《农业机械学报》2021,52(12):32-42,64

针对马铃薯播种开沟器高速作业条件下作业阻力大、回土深度浅、干湿土易混合等问题,基于黄鳍金枪鱼下颚流线型曲线,采用水平直元线法将原有曲线重构为三维曲面,设计一种仿黄鳍金枪鱼下颚曲线的曲面式开沟器。根据马铃薯种植深度的农艺要求,当最大作业深度为150mm时,采用滑切原理确定了最大刃口角为132°,元线角为27°。为探究起土角对开沟器作业性能的影响,以作业阻力为评价指标,进行单因素试验,确定了分土板的起土角为45°。通过分析种薯下落到地表时的相对位移确定上挡土板的长度。干湿土分层仿真试验表明,开沟器作业不扰乱土层顺序。田间多工况对比试验表明,在开沟深度为100、125、150mm,作业速度为3.6、5.4、7.2km/h条件下,曲面式开沟器比芯铧式开沟器、靴式开沟器平均作业阻力减小18.3%、33.4%,平均回土深度增加70.4%、91.7%。田间性能对比试验表明,在开沟深度为150mm,作业速度为7.2km/h条件下,曲面式开沟器比芯铧式开沟器、靴式开沟器种沟中土壤含水率增加3.5%、4.7%,曲面式开沟器能减少干湿土混合,曲面式开沟器比芯铧式开沟器、靴式开沟器种薯横向偏移系数减小9.5%、10.1%,满足马铃薯种植开沟的农艺要求。  相似文献   

Aquaculture of Bluefin tuna in the Mediterranean: evaluation of organic particulate wastes   总被引：1，自引：0，他引：1  

Rubén Vita  Arnaldo Marín  Blanca Jiménez-Brinquis  Augusto Cesar  Lazaro Marín-Guirao  & Miguel Borredat 《Aquaculture Research》2004,35(14):1384-1387

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Spatial differentiation in the eastern Pacific yellowfin tuna revealed by microsatellite variation   总被引：3，自引：0，他引：3  

Pindaro Díaz-Jaimes  Manuel Uribe-Alcocer 《Fisheries Science》2006,72(3):590-596

ABSTRACT:   Five eastern Pacific yellowfin tuna samples (four northern: 10–25°N, 95–130°W, and one southern: 16–18°S, 95–97°W), collected from fishing vessels between 1994 and 2002 were analyzed for variation at seven microsatellite loci to evaluate their spatial genetic homogeneity. Single-locus homogeneity exact tests revealed significant genetic differentiation caused by three of seven loci. Pairwise sample comparisons of multilocus allele-frequency homogeneity tests and subpopulation division ( F _ST), revealed significant differentiation in comparisons between north equatorial samples and the south equatorial sample. amova analysis among collections grouped as northern and southern populations separated by the equator in the eastern Pacific confirmed the differentiation observed. These results may be considered as preliminary evidence of the presence of discrete populations in the eastern Pacific yellowfin tuna. The possibility that the spatial differentiation observed corresponds to temporal variation or non-random sampling cannot be discarded. The genetic differences encountered need to be corroborated by increasing sample sizes, including temporal replicates, and by the use of an alternative marker.  相似文献