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New way to investigate fish density and distribution in the shallowest layers of the open water
Fisheries Research ( IF 2.4 ) Pub Date : 2021-02-22 , DOI: 10.1016/j.fishres.2021.105907
Roman Baran , Petr Blabolil , Martin Čech , Vladislav Draštík , Jaroslava Frouzová , Michaela Holubová , Tomáš Jůza , Ievgen Koliada , Milan Muška , Jiří Peterka , Marie Prchalová , Milan Říha , Zuzana Sajdlová , Marek Šmejkal , Michal Tušer , Lukáš Vejřík , Jan Kubečka

Information about fish distribution and abundance in the upper part of the water column are often fundamental for both research and management. However, this information is extremely hard to obtain using conventional hydroacoustic methods. For this reason, the mobile hydroacoustic upward-looking system (38 kHz split-beam echosounder) in combination with a passive sampling method (gillnets) was tested to investigate the fish community (fish larger than 8 cm total length) in the upper 3 m of water column of the Římov Reservoir (Czech Republic) during the growing season. We found most fish located in the depth layer closest to the surface down to 1 m – 50–78 % by acoustics (layer 0.3; 1 m) and 55-–1 m) and 55–71 % by gillnets. The size structure of both methods was generally similar, but the acoustic results contained a higher proportion of small fish (<12 cm TL). The upward-looking system is a promising approach to study the fish community in the neglected surface layer, but more studies of its efficiency for large fish monitoring are needed.



中文翻译:

调查开放水域最浅层鱼类密度和分布的新方法

有关水柱上部鱼的分布和丰度的信息通常是研究和管理的基础。但是,使用常规水声方法很难获得该信息。因此,对移动水声向上看系统(38 kHz分离波束回声测深仪)与被动采样方法(刺网)相结合进行了测试,以调查上方3 m处的鱼类群落(总长大于8 cm的鱼类)莫夫水库(捷克共和国)生长期的水柱高度变化。我们发现,大多数鱼位于最靠近水面的深层,通过声学(0.3层; 1 m)和55–1 m)降低了1 m – 50–78%,而刺网则降低了55–71%。两种方法的大小结构大致相似,但是声学结果包含的小鱼比例更高(<12 cm TL)。朝上看的系统是研究被忽视的表层鱼类群落的一种有前途的方法,但是需要更多研究其在大型鱼类监测中的效率。

更新日期:2021-02-22
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