Vertical oscillations of the thermocline caused by internal waves modify coldwater pelagic fish distribution: Results from a large stratified lake

Author(s):  
Bryan Flood ◽  
Mathew Wells ◽  
Erin Dunlop ◽  
Joelle Young
2019 ◽  
Vol 75 (2) ◽  
pp. I_1129-I_1134
Author(s):  
Takaharu HAMADA ◽  
Tsukasa YOSHIDA ◽  
Hiroshi OKAMURA ◽  
Takeshi HARA ◽  
Teruaki SUZUKI

2021 ◽  
Author(s):  
Elvio Agustín Luzenti ◽  
Guillermo Martín Svendsen ◽  
Mariana Degrati ◽  
Nadia Soledad Curcio ◽  
Raúl Alberto González ◽  
...  

<em>Abstract.</em>—Pelagic fish abundance and distribution was estimated acoustically at Bowline and Indian Point power plants on the Hudson River, New York, during July, August, and September 1996, in a study designed to determine size-specific spatial and temporal fish abundance and distribution with respect to environmental variables (i.e., photoperiod, depth strata, field). August yielded the greatest (<EM>P </EM>< 0.05) mean density of fish at both power plants. Fish were concentrated in Bowline’s near-field (lagoon) region, thus increasing the potential for deleterious impingement and entrainment effects there. For all size classes, mean fish density was greatest during darkness at both power plants. Generally, the two power plants exhibited similar trends in mean fish abundance with respect to water depth and photoperiod. During July and August mean fish density was significantly higher between 1.5 and 4.5 m (depth strata one) of depth at both power plants. Bowline’s mean fish density was greater under near-field, shallow depth (depth strata one) darkness during July and August. Bowline’s isolated and bathymetrically complex near-field lagoon concentrated pelagic fish compared to the river proper. Hydroacoustics were useful in providing a detailed map of fish distribution relative to each power plant over the course of a few days each month. Hydroacoustic monitoring could mitigate negative effects to pelagic fish at existing and proposed power plants, through sighting of power plant water intake structures or by providing a biological basis for modified production cycles.


2020 ◽  
Vol 22 (1) ◽  
pp. 212-225
Author(s):  
Alexandre Schickele ◽  
Eric Goberville ◽  
Boris Leroy ◽  
Gregory Beaugrand ◽  
Tarek Hattab ◽  
...  

2008 ◽  
Vol 53 (1) ◽  
pp. 354-367 ◽  
Author(s):  
AndrÉs Gímez-Giraldo ◽  
Jörg Imberger ◽  
Jason P. Antenucci ◽  
Peter S. Yeates

Author(s):  
Nadia Watung ◽  
Christian R. Dien ◽  
Olvie V. Kotambunan

Abstract The study examines the social economics characters of fisherman in Lopana southern of Minahasa north Sulawesi province. This study aims to identify and assess fisherman lifes that includes economics and social, the fisherman society in Lopana, fish distribution, education, etc. The result of the study, people in Lopana mostly works as fisherman for their life, the catch is classified as pelagic fish. Marketing system of fishermen, wholesaler, fish traider and consumers. But if it catches a bit of a marketing system directly to consumers. Sharing system 50% for owners and 50% for fishermen workers. Keywords: Social economics character of fisherman, Lopana   Abstrak Penelitian ini mengkaji tentang karakteristik sosial ekonomi masyarakat nelayan di Desa Lopana Kecamatan Amurang Timur Propinsi Sulawesi Utara. Penelitian bertujuan untuk mempelajari aspek sosial dan ekonomi masyarakat nelayan yang mencakup masyarakat nelayan, pendidikan, dll. Kebanyakan masyarakat di Lopana bekerja sebagai nelayan untuk kehidupan mereka, hasil tangkapan yang diperoleh kebanyakan ikan pelagis.Sistem pemasaran dari nelayan, pedagang besar, pedagang pengecer, konsumen. Tetapi jika hasil tangkapan sedikit, sistem pemasaran yang dilakukan dari nelayan langsung kepada konsumen. Sistem bagi hasil 50% untuk nelayan pemilik soma dampar dan 50% untuk nelayan pekerja. Kata Kunci: Karakteristik sosial ekonomi, Soma Dampar Pancing ulur, Desa Lopana


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