Observations of activity, catches, discards and causes of discards on board commercial fishing vessels

data were collected from the regional program loupe (observation of the habitat and associated communities in the context of the fisheries of the capbreton canyon). it consisted in the observations of two métiers practiced around the canyon. the observations were carried out between july 2011 and april 2013 on coastal boats. observations and interviews were made on board commercial vessels.the longlines used in the hake fishery are semi-pelagic and are deployed on the edge of the capbreton canyon. it is an emblematic and major métier benefiting from a particular regulation as they take advantage of a prohibition of net and trawl fishing on their fishing grounds. between 8 and 14 costal boats practice this métier during the year and the fleet characteristics are homogeneous. boats lay between 1,200 and 1,800 hooks per day, baited with frozen pilchard (sardina pilchardus). two or three men are on board these vessels. fishing is mostly practiced in spring and summer but a small number of vessels work all year. generally, trips last between ten and twelve hours; longline is set before sunrise and retrieved three or four hours later. hake is the main targeted species; other targets are pollack (pollachius pollachius), red sea bream (pagellus bogaraveo) and conger (conger conger).netting is a major métier in terms of vessels involved and the number of trips. crew composition varies and depends on boat length (from one to four men on average). this métier is practiced by 30 to 35 boats all year round, but fleet characteristics are less homogeneous than in the case of longliners . the strategy of these netters operating in the coastal area is based on the use of several types of nets (gillnets and trammel nets) targeting several species, often sold directly to consumers on the docks. gillnets, consisting of a single mesh, target hake, sea bass and sea bream species (diplodus spp, sparus aurata, litognathus mormyrus), while the trammel nets (three meshes) are used to capture benthic fish, such as common sole, monkfish (lophius spp), turbot and brill (scophthalmus rhombus). generally, trips last less than twelve hours for coastal netters (less than 15 m), which predominate in the sector, and a few days for large netters. on average, the coastal vessels set 6000 to 8000 m. nets daily.

数据采集自区域项目 Loupe（在卡普布隆峡谷渔业背景下对栖息地及其相关群落进行的观察）。该数据集由对峡谷周边两项传统工艺的观察构成。观测活动于2011年7月至2013年4月期间在沿海船只上进行。观测和访谈在商用船只上完成。在鳕鱼渔业中使用的延绳钓属于中层水域类型，并部署在卡普布隆峡谷的边缘。延绳钓是一项标志性的主要工艺，它得益于一项特殊的法规，因为其在捕鱼区享有禁止网捕和拖网的特权。每年有8至14艘沿海船只从事此工艺，船队特征相对一致。船只每日投放的钩数介于1,200至1,800个，使用冷冻沙丁鱼（Sardina pilchardus）作为诱饵。这些船只上通常有两人或三人。捕鱼活动主要在春季和夏季进行，但有一小部分船只全年作业。通常，航程持续十至十二小时；延绳钓在日出前设置，并在三至四小时后收回。鳕鱼是主要的目标物种；其他目标物种包括大比目鱼（Pollachius pollachius）、红海鲈（Pagellus bogaraveo）和乌鳢（Conger conger）。就涉及的船只数量和航次数量而言，网捕是一项重要的工艺。船员组成各异，取决于船体长度（平均为一至四人）。此工艺由30至35艘船全年进行，但与延绳钓船队相比，其船队特征较为不统一。这些在沿海区域作业的网捕者采用的策略基于使用多种类型的网具（如刺网和拖网）针对多种物种，通常在码头直接销售给消费者。刺网，由单一网目组成，针对鳕鱼、海鲈和海鲈类（Diplodus spp, Sparus aurata, Litognathus mormyrus）等物种；而拖网（三网目）用于捕获底栖鱼类，如普通鳎鱼、乌鳢（Lophius spp）、鳎鱼和鲽鱼（Scophthalmus rhombus）。一般来说，沿海网捕者的航程持续时间少于十二小时（船只长度小于15米），在该领域占主导地位，而大型网捕者的航程则持续几天。平均而言，沿海船只每日设置6,000至8,000米的网具。