Fish Bulletin No. 21. Analysis of Boat Catches of White Sea Bass (Cynoscion nobilis) at San Pedro, California
Fish Bulletin No. 21. Analysis of Boat Catches of White Sea Bass (Cynoscion nobilis) at San Pedro, California
复制标题
第 21 号鱼类通报。加利福尼亚州圣佩德罗的白海鲈鱼 (Cynoscion nobilis) 渔获量分析
DOI：
--
复制
发表时间：
1929
期刊：
影响因子：
--
通讯作者：
S. Whitehead
中科院分区：
文献类型：
--
作者：
S. Whitehead
作者：Whitehead，S S|翻译后摘要：确定渔业的条件是在其管理的第一步。同样重要的是，要了解一个渔业正在承受压力，就像了解它正在被过度开发一样。如果资源明显耗尽，便应通过法例予以保障。当一个渔业的地位有问题时，确定这一地位所需的时间是一个很大的因素，应在尽可能短的时间内告知管理人员是否需要保护。通过使用确定单位努力回报的方法作为标准，这些需要得到满足;只要收集了多年的统计数据，就可以得到单位努力的回报。在加州，商业渔业局（Bureau of Commercial Fisheries of the Division of Fish and Game）自1918年以来一直在收集统计数据，以分析其渔业状况。根据法律的要求，鱼购买者记录每种鱼的购买量、交货港、价格、渔民姓名、船名、船号和日期。这一记录一式三份，由鱼类和野味司免费发给所有鱼类购买者。渔民的副本是一张白色收据，买方的副本是黄色的，鱼类和野味部门的副本是粉红色的（被称为“粉红票”）。当渔获物是一天捕鱼的产物时，这些粉红色的票据为渔获物分析提供所需的数据。当渔获物是一天以上捕捞的产物时，粉红色的票往往是不够的，因为努力单位经常波动。在一个每天都有渔获上岸的渔场中，努力的单位是一天的捕鱼量，而捕获的鱼的数量是回报。由于这种确定每单位努力回报增加或减少的方法是逐年比较，因此努力单位必须保持不变。这意味着在整个调查期间，船只的齿轮以及时间间隔必须保持不变。有关石首鱼科物种白色鲈鱼（Cynoscion nobilis）种群状况的问题已引起商业渔业局的注意。由于确定加州商业渔业状况是鱼类和野味司加州国家渔业实验室的职能，因此进行了以下调查。
Author(s): Whitehead, S S | Abstract: Determining the condition of a fishery is a first step in its administration. It is equally as important to learn that a fishery is withstanding a strain as to know that it is being overexploited. If depletion is evident, legislation should be passed to give protection. When the status of a fishery is in question the length of time taken to determine this status is a big factor and the administrator should be advised in the least time possible whether or not protection is necessary. By using the method of determining the return per unit of effort expended as a criterion these needs are met; provided statistics over a long period of years have been collected to give the return per unit of effort. In California the Bureau of Commercial Fisheries of the Division of Fish and Game has been gathering statistics since 1918 for analyses of its fisheries. By legal requirement the fish buyer records the amount of each species purchased, port of delivery, price, fisherman's name, boat name, boat number, and the date. This record is made out in triplicate in a receipt book issued free of charge by the Division of Fish and Game to all fish buyers. The fisherman's copy is a white receipt, the buyer's yellow, and that of the Division of Fish and Game pink (known as the "pink ticket"). These pink tickets provide the required data for a catch analysis when the catches are the product of one day's fishing. When the catches are the product of more than one day's fishing, the pink tickets are apt to be inadequate because the unit of effort frequently fluctuates. In a fishery where the catches are landed each day, the unit of effort will be one day's fishing, and the amount of fish caught will be the return. As this method of determining increase or decrease of return per unit of effort is a comparison from year to year, it is necessary that the unit of effort remain constant. This means that the gear of the boat as well as the time interval must remain unchanged throughout the period of investigation. The question as to the condition of the population of white sea bass, Cynoscion nobilis, a species of the Croaker family, has been brought to the attention of the Bureau of Commercial Fisheries. As it is the function of the California State Fisheries Laboratory of the Division of Fish and Game to determine the condition of the commercial fisheries of California, the following investigation has been pursued.