منابع مشابه
Floating faeces for a cleaner fish production
Recent developments in European recirculating aquaculture systems suggest expanding potential for this extremely water-efficient technique. However, the technology still faces challenges due to concerns over economic efficiency and system stability—both essential in minimizing the risk of financially and environmentally expensive failures. One key factor in maintaining stable production conditi...
متن کاملPredicting Postrelease Survival in Large Pelagic Fish
—Sharks, turtles, billfish, and marine mammals are frequently caught accidentally in commercial fisheries. Although conservationists and fisheries managers encourage the release of these nontarget species, the long-term outcome of released animals is uncertain. Using blue sharks Prionace glauca, we developed a model to predict the long-term survival of released animals based on analysis of smal...
متن کاملA length-based hypothesis for feeding migrations in pelagic fish
We evaluated the costs and benefits of long-distance horizontal migration by pelagic planktivores, Atlantic herring (Clupea harengus), blue whiting (Micromesistius poutassou), mackerel (Scomber scombrus), and capelin (Mallotus villosus) in the Norwegian and Barents seas using a numerical model and tested model predictions against field observations. Specifically, we considered (i) energetic cos...
متن کاملCOMPARISON Of AUDITORy SENSITIvITy Of PElAGIC fISH wITH THE SOUND GENERATED by A fISH AGGREGATION DEvICE
INTRODUCTION Anchored bamboo fish-aggregating devices (FADs) are used to catch tuna and small pelagic fish. Several hypotheses had been advanced previously to explain the association of fish with FADs (Castro et al. 2002; Fréon & Misund 1999), but the processes responsible for fish attraction and aggregation remain unknown. There is no previous research on fish behaviour related to sound near F...
متن کاملAn ODE Model of the Motion of Pelagic Fish
A system of ordinary differential equations (ODEs) is derived from a discrete system of Vicsek, Czirók et al. [Phys. Rev. Lett. 75(6):1226–1229, 1995], describing the motion of a school of fish. Classes of linear and stationary solutions of the ODEs are found and their stability explored using equivariant bifurcation theory. The existence of periodic and toroidal solutions is also proven under ...
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ژورنال
عنوان ژورنال: Nature
سال: 1872
ISSN: 0028-0836,1476-4687
DOI: 10.1038/005462c0