Abstract:
:Larval fishes suffer prodigious mortality rates, eliminating 99% of the brood within a few days after first feeding. Hjort (1914) famously attributed this "critical period" of low survival to the larvae's inability to obtain sufficient food [Hjort (1914) Rapp P-v Réun Cons Int Explor Mer 20:1-228]. However, the cause of this poor feeding success remains to be identified. Here, we show that hydrodynamic constraints on the ubiquitous suction mechanism in first-feeding larvae limit their ability to capture prey, thereby reducing their feeding rates. Dynamic-scaling experiments revealed that larval size is the primary determinant of feeding rate, independent of other ontogenetic effects. We conclude that first-feeding larvae experience "hydrodynamic starvation," in which low Reynolds numbers mechanistically limit their feeding performance even under high prey densities. Our results provide a hydrodynamic perspective on feeding of larval fishes that focuses on the physical properties of the larvae and prey, rather than on prey concentration and the rate of encounters.
journal_name
Proc Natl Acad Sci U S Aauthors
China V,Holzman Rdoi
10.1073/pnas.1323205111subject
Has Abstractpub_date
2014-06-03 00:00:00pages
8083-8issue
22eissn
0027-8424issn
1091-6490pii
1323205111journal_volume
111pub_type
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