Flowing water decreases hydrodynamic signal detection in a fish with an epidermal lateral-line system

Bassett, Daniel K., Carton, Alexander G., and Montgomery, John C. (2006) Flowing water decreases hydrodynamic signal detection in a fish with an epidermal lateral-line system. Marine and Freshwater Research, 57 (6). pp. 611-617.

[img] PDF
Restricted to Repository staff only

View at Publisher Website: http://dx.doi.org/10.1071/MF05193


The lateral-line system of the common bully, Gobiomorphus cotidianus, is unusual in that it possesses an extensive array of superficial neuromasts. Fish were trained to orientate to a small vibrating bead (50 Hz). By manipulating the amplitude of vibration to determine the threshold level for the behaviour, the hydrodynamic detection capabilities of the common bully were characterised in both still- and flowing-water. In still water, the common bully attained a detection threshold (calculated as the amplitude of water particle displacement at the snout) of 3.3 × 10-5 cm at 50 Hz. Successive elevations in the background flow caused a 10-fold decrease in detection sensitivity. At a background flow of 4.5 cm s–1 the detection threshold increased to 3 × 10-4 cm. These findings demonstrate that a lateral-line system that lacks sub-surface canal neuromasts is most sensitive in still-water conditions (low-noise). However, this system is compromised under flowing-water conditions such that sensitivity is reduced at current velocities >1.5 cm s–1.

Item ID: 3461
Item Type: Article (Research - C1)
ISSN: 1448-6059
Keywords: background flow, detection response, epidermal lateral line, sensitivity
Date Deposited: 10 Jul 2009 00:30
FoR Codes: 06 BIOLOGICAL SCIENCES > 0606 Physiology > 060699 Physiology not elsewhere classified @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960807 Fresh, Ground and Surface Water Flora, Fauna and Biodiversity @ 100%
Downloads: Total: 7
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page