Fish spawning areas of the three large lakes

The geoproduct spawning areas describes fish spawning areas in Lake Brienz, Thun, and Bielersee. The information is divided into three levels. The suitability as a spawning substrate means whether shore areas in Lake Brienz and Thun (without Lake Biel) are suitable as spawning grounds for certain fish species. The spawning plain describes known and potential spawning areas, as well as traditional spawning fishing areas for various species in all three lakes. The level of aquatic plants is where reed plants and macrophytes are found in Lake Brienz, Thun and Lake Biel. This level, as a fish habitat, is to be equated with fish spawning areas, as many species use these structures as spawning areas (plant spawns).本地理产品类产卵区数据集（geoproduct spawning areas）涵盖布里恩茨湖（Lake Brienz）、图恩湖（Lake Thun）及比尔湖（Bielersee）的鱼类产卵场分布信息。该数据集内容分为三个层级：其一为产卵基质适宜性：指布里恩茨湖与图恩湖（不含比尔湖）的近岸区域是否适合作为特定鱼类的产卵场；其二为产卵场范围：涵盖三座湖泊内已知与潜在的各类鱼类产卵场，以及针对不同鱼类的传统产卵期捕捞作业区域；其三为水生植物分布：指布里恩茨湖、图恩湖及比尔湖内芦苇与大型水生植物（macrophytes）的分布区域。该层级作为鱼类栖息地，可等效视为鱼类产卵场——因多数鱼类会以这类植被结构作为产卵场所（即植物附着型鱼卵产卵场）。