The sampling efficiency of electrofishing for Neogobius species in a riprap habitat: a field experiment
| Authors | |
|---|---|
| Year of publication | 2008 |
| Type | Article in Periodical |
| Magazine / Source | Journal of Applied Ichthyology |
| MU Faculty or unit | |
| Citation | |
| Field | Ecology |
| Keywords | Danube; Neogobius |
| Description | To determine the efficiency of electrofishing Neogobius spp. and quantitatively estimate sampling bias in a riprap (shot rock used to armor shorelines against water erosion) mesohabitat, riprap fragments were set-up in a natural riverine environment. The experimental setting enabled us to collect all fish remaining in the riprap fragments after these areas had been electrofished. The sampling efficiency of electrofishing Neogobius spp. (dominated by N. melanostomus) varied between 17.6 and 47.4 % (mean 29.7 %), while percids (possessing a well developed swim bladder) were collected with 74.6 % efficiency. Decreased electrofishing efficiency in areas of rocky substrate should be considered in estimates of total abundance of Neogobius spp., especially if they are to be compared with catches of other species possessing swim bladders. |
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