Age and growth of alfonsino Beryx splendens in the waters around the Izu Islands
Age and growth of alfonsino Beryx splendens in the waters around the Izu Islands
复制标题
伊豆群岛周边海域金鳅的年龄和生长情况
DOI：
10.1046/j.1444-2906.2000.00039.x
复制
发表时间：
2000
影响因子：
1.9
通讯作者：
T. Kitakado
中科院分区：
文献类型：
--
作者：
K. Adachi;K. Takagi;E. Tanaka;S. Yamada;T. Kitakado
摘要：
本文估计了日本太平洋沿岸伊豆群岛附近海域中的Alfonsino Beryx辉石的年龄和生长。样本包括1995年12月至1996年11月期间近海延绳钓上岸的250条鱼和1995年2月沿海延绳钓上岸的10条鱼。通过显微镜表面法，读数矢状面耳石上透明带和不透明带的个数，判断边缘是否透明，并测量每个透明带从焦点到外缘的半径。为了估计von Bertalanffy生长方程中代表整体年龄的参数、年龄和叉长数据以及1岁时的平均长度。在以前的研究中都采用了最大似然法。结果表明，近海样品耳石可读率为97.6%，近岸样品耳石可读率为100%。不透明边缘频率的月度变化表明，透明和不透明区域每年铺设一次。透明带从5-7月开始形成(8月份达到峰值)。近海样品的年龄为2~23年，近海样品的年龄为2~5岁。估计生长曲线：男L=44.4[1-exp{-0.132(t+3.45)}]，女L(T)=45.0[1-exp{-0.150(t+2.08)}]，其中L(T)和t分别表示叉长(Cm)和年龄。对今后需要解决的问题进行了讨论。
SUMMARY:
This paper estimates the age and growth of the alfonsino Beryx splendens in the waters around the Izu Islands off the Pacific side of Japan. The samples consist of 250 fish of the landings of the offshore longliners from December 1995 to November 1996 and 10 fish of the coastal longliners in February of 1995. By the surface method using a microscope, a reader counted the number of hyaline and opaque zones on the sagittal otoliths, judged whether the edge was hyaline, and measured the radii from the focus to the outer edge of each hyaline zone. In order to estimate the parameters of the von Bertalanffy’s growth equation representing the overall ages, the age and fork length data and the mean length at 1 year old. In a previous study were used for the maximum likelihood approach. From the results, the rate of readability of the otolith from the offshore samples was 97.6% and that from the coastal samples was 100%. The monthly changes in the frequency of the opaque edge showed that the hyaline and opaque zones were laid down once a year. The hyaline zone began to form from May to July (peaking in August). The ages of the offshore samples for both the sexes ranged from 2 to 23 years, and those of the coastal samples 2 to 5, respectively. The estimated growth curves were expressed by l(t) = 44.4[1–exp{–0.132(t + 3.45)}] for males and l(t) = 45.0[1–exp{–0.150(t + 2.08)}] for females, where l(t) and t denote the fork length (cm) and the age in years, respectively. The issues to be resolved in the future were discussed.