Izvorni znanstveni članak
DEMONSTRATION OF A MULTIPLE DRIFT NET FOR AQUATIC ORGANISMS
Michael D. Porter
orcid.org/0000-0002-0094-5165
; U.S. Army Corps of Engineers, Albuquerque District, 4101 Jefferson Plaza NE, Albuquerque, NM 87109 USA
Seth Kennedy
; Northwind, Arvada, CO 80003 USA
Juddson Sechrist
; U.S. Bureau of Reclamation, Columbia Pacific Northwest Regional Office, 1150 N. Curtis Rd, Boise, ID 83706 USA
Sažetak
The distribution of drifting semi-buoyant fish eggs within a river is useful for understanding the ecology of pelagic-broadcast spawning fish. The vertical position of semi-buoyant eggs in the water column is an important parameter describing transport processes for these species. We designed a multiple drift net (five rectangular nets attached to a frame) to vertically divide the water column into stacked horizontal layers to sample drifting semi-buoyant particles. We deployed the multiple drift net gear beside Moore egg collectors in a wadeable channel to sample the vertical distribution of semi-buoyant polyacrylamide gel beads as surrogates for fish eggs in the water column. The vertical distribution of beads was predominantly found in the deeper nets of the multiple drift net gear while the surface nets and Moore egg collectors had fewer beads which is similar to the results in other studies of pelagic-broadcast spawning fish. The multiple drift net gear is a tool that demonstrates the capability to sample the water column under variable flow conditions (depth, velocity and turbulence) for field data on the vertical distribution of drifting eggs (or surrogates). These empirical data can quantify drift patterns of eggs for modeling transport and retention in pelagic-broadcast spawning species.
Ključne riječi
Pelagic-broadcast spawning fish; egg drift; Rio Grande Silvery Minnow; Hybognathus amarus
Hrčak ID:
252985
URI
Datum izdavanja:
3.3.2021.
Posjeta: 634 *