| 摘要: |
| 本文根据2012年10月-2013年3月在印度洋中西部海域金枪鱼延绳钓渔业调查所获得的样本, 利用其脊椎骨鉴定了334尾大眼金枪鱼(Thunnus obesus)的年龄, 并利用鱼类脂肪含量仪测定了其肌肉的脂肪含量, 进而对年龄与脂肪含量的关系进行了研究。结果表明样本金枪鱼的特征如下: (1) 年龄组成为1-9龄, 其中4-6龄比例最大, 约占样本总数的66.4%;(2) 脂肪含量范围为3.1%-29.8%, 平均为13.4%, 优势范围在7.0%-17.0%之间, 其中13.0%-17.0%的比例最高达51.4%;(3) 通过比较不同年龄组的脂肪含量发现, 鱼体脂肪含量1-3龄随年龄增加而下降。4-5龄脂肪含量较高, 6龄急剧下降到最低, 7-9龄又呈升高的趋势;(4) 雌性和雄性大眼金枪鱼的新陈代谢变化无明显差异, 雌性比雄性的性成熟年龄要早1年左右, 雌性3-4龄时性成熟, 而雄性为4-5龄时性成熟;(5) 脂肪含量的变化可能与大眼金枪鱼生长、繁殖、衰老等过程中的新陈代谢变化相吻合。 |
| 关键词: 大眼金枪鱼 年龄 脂肪含量 印度洋中西部 |
| DOI：10.11693/hyhz20141000292 |
| 分类号: |
| 基金项目:国家高技术研究发展计划(863)项目,2012AA092302号;高等学校博士学科点专项科研基金联合项目,20113104110004号;上海市教育委员会科研创新项目,12ZZ168号。 |
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| RELATIONSHIP BETWEEN AGE AND MUSCLE FAT CONTENT OF BIGEYE TUNA (THUNNUS OBESUS) IN THE WESTERN AND CENTRAL INDIAN OCEAN |
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SONG Li-Ming1,2,3,4, ZHAO Hai-Long1, LI Dong-Jing1
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1.College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;2.National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, China;3.The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources of Ministry of Education, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;4.Collaboration Innovation Center for National Distant-water Fisheries, Shanghai 201306, China
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| Abstract: |
| We caught 334 bigeye tuna Thunnus obesus in a longline fishery survey in western and central Indian Ocean from October 2012 to March 2013 to determine the age-fat content relationship.The age was estimated by counting vertebra annual rings, and the muscle fat content was measured with fish fat content meter.Results showed that the age spanned 1-9 year old, mainly 4-6 (occupying 66.4%);the muscle fat content ranged 3.1%-29.8% in average of 13.4 %, mainly between 7.0% and 17.0%, mostly 13.0%-17.0% (taking 51.4%).Among different age groups, the muscle fat content of the 4-5 ones was the greatest while that 6 was the least, that of 1-3 ones decreased with age while that of 7-9 showed the opposite trend.No significant difference was observed in metabolism between male and female bigeye tuna.The age of sexual maturity of female occurred in 3-4 year old, while that of male ones in 4-5 years old.We believe that change in fat content of bigeye tuna reflect the metabolism variation indifferent life stages from growth, maturity, to aging. |
| Key words: Thunnus obesus age muscle fat content Western and Central Indian Ocean |
