External damage and changes in blood parameters in female tench, <Emphasis Type="Italic">Tinca tinca</Emphasis> (L.) retained in anglers’ keepnets |
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Authors: | José Martín Gallardo Sayyed Mohammad Hadi Alavi Zdeněk Adámek Bořek Drozd |
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Institution: | 1.Ecology Area,University of Extremadura,Badajoz,Spain;2.Research Institute of Fish Culture and Hydrobiology,University of South Bohemia,Vodňany,Czech Republic |
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Abstract: | The effect of keeping female tench in two different types of keepnets for 24 h after landing was tested. The first type, fine
knotted nylon mesh, was placed in two different positions in the edge: (a) anglers position, anchored on one side and (b)
stretch position, anchored on both ends of the keepnets. The second type was made of dense fine and soft textile net in black
color and anchored on both ends in a stretch position. After capture by rod the fish were landed by hand, the hook was removed
and the damage to the body and fins checked before confining the fish inside the keepnets. After confinement, blood samples
were collected and the number, disposition and extent of wounds checked. The retention in the keepnets did not produce significant
changes in plasma cortisol, glucose and osmolality. Fine knotted nets caused more injuries than the soft textile one. As a
consequence, the use of this latter type is recommended for tench retention. |
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