dc.contributor.author | Gerber, Ruan | |
dc.contributor.author | Howatson, Glyn | |
dc.contributor.author | Smit, Nico | |
dc.contributor.author | Greenfield, Richard | |
dc.contributor.author | Wagenaar, Ina | |
dc.date.accessioned | 2017-08-04T08:00:33Z | |
dc.date.available | 2017-08-04T08:00:33Z | |
dc.date.issued | 2017 | |
dc.identifier.citation | Gerber, R. et al. 2017. Physiological response to angling of Africa’s premier freshwater angling species, the tigerfish Hydrocynus vittatus. African zoology, 52(2):91-98. [http://dx.doi.org/10.1080/15627020.2017.1300069] | en_US |
dc.identifier.issn | 1562-7020 | |
dc.identifier.issn | 2224-073X (Online) | |
dc.identifier.uri | http://hdl.handle.net/10394/25330 | |
dc.identifier.uri | http://dx.doi.org/10.1080/15627020.2017.1300069 | |
dc.description.abstract | Angling fraternities widely promote catch-and-release (C&R) as a fisheries management tool. This study aimed
to determine the physiological response of Africa’s premier freshwater angling species, the tigerfish
Hydrocynus
vittatus
, to C&R angling in the Okavango Delta, Botswana. Standard angling techniques were used to collect fish,
whereafter fish were anaesthetised in clove oil, blood drawn from the caudal vein and general biometric data noted,
then revived and released. Blood plasma was analysed for glucose, cortisol and lactate concentrations to assess
the effects of angling duration, fish size and fish condition. Larger fish were angled for a longer duration. Plasma
glucose concentrations decreased with greater lactate concentrations, an indication of the aerobic and anaerobic
work done during capture. Few individuals showed increased plasma cortisol concentrations. In extended-capture
fish (angled for
>
1 min), lactate concentrations increased significantly above values for control fish. A linear
regression analysis showed that well-fed fish had less of a stress response compared with less well-fed individuals.
Furthermore, a discriminant function analysis indicated that the suite of biomarkers used were successful in
indicating different stress responses according to angling duration. Angling and handling times along with
nutritional status were likely influential factors in the range of glucose, cortisol and especially lactate levels in this
study. These data suggest that C&R causes physiological stress to tigerfish, but could nonetheless be a valuable
fisheries management tool, ensuring the sustainability of fish populations | en_US |
dc.language.iso | en | en_US |
dc.publisher | Taylor & Francis | en_US |
dc.subject | Cortisol | en_US |
dc.subject | Discriminant function analysis | en_US |
dc.subject | Glucose | en_US |
dc.subject | Lactate | en_US |
dc.subject | Plasma biomarkers | en_US |
dc.subject | Univariate statistics | en_US |
dc.title | Physiological response to angling of Africa’s premier freshwater angling species, the tigerfish Hydrocynus vittatus | en_US |
dc.type | Article | en_US |
dc.contributor.researchID | 26084759 - Howatson, Glyn | |
dc.contributor.researchID | 21250545 - Smit, Nicholas Jacobus | |