Experimental Study of Galvanonarcosis for Rainbow Trout (<i>Salmo gairdneri</i>) Immobilization

Kynard, Boyd; Lonsdale, E. M.

doi:10.1139/f75-031

Cited by 29 publications

(31 citation statements)

References 2 publications

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“…We tagged fish in January-February 2001 andJanuary 2002, that is, during the NovemberFebruary spawning seasons of 2000-2001 and 2001-2002. We captured fish with gill nets or cast nets and held them in a nearby floating net-pen for as long as 2 h before tagging. We held fish for tagging in a small portable tank filled with 30 L of river water and immobilized them using electronarcosis with nonpulsed 30 V DC (Kynard and Lonsdale 1975;Ross and Ross 1999). Prior to tagging, we determined fish weight (W) and standard length (SL).…”

Section: Methodsmentioning

confidence: 99%

“…This length of time was necessary to carefully make an incision through the thick body wall, determine sex and reproductive stage, insert the tag and antenna, close the incision, and hold the fish in the recovery bath. Tagging could be done slowly and carefully because fish that were held immobilized for 2 h by means of electronarcosis recovered quickly and had no deleterious effects (Kynard and Lonsdale 1975). We held fish in the net pen for 1-3 h to ensure recovery before release.…”

Section: Methodsmentioning

confidence: 99%

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Migration and Spawning of Radio‐Tagged Zulega Prochilodus argenteus in a Dammed Brazilian River

Godinho

Kynard

2006

Trans Am Fish Soc

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Abstract.-It is difficult for agencies to evaluate the impacts of the many planned dams on São Francisco River, Brazil, migratory fishes because fish migrations are poorly known. We conducted a study on zulega Prochilodus argenteus, an important commercial and recreational fish in the São Francisco River, to identify migrations and spawning areas and to determine linear home range. During two spawning seasons (2001)(2002)(2003), we radio-tagged fish in three main-stem reaches downstream of Três Marias Dam (TMD), located at river kilometer (rkm) 2,109. We tagged 10 fish at Três Marias (TM), which is 5 km downstream of TMD; 12 fish at Pontal, which is 28 km downstream of TMD and which includes the mouth of the Abaeté River; and 10 fish at Cilga, which is 45 km downstream of TMD. Late-stage (ripe) adults tagged in each area during the spawning season remained at or near the tagging site, except for four Cilga fish that went to Pontal and probably spawned. The Pontal area at the Abaeté River mouth was the most important spawning site we found. Prespawning fish moved back and forth between main-stem staging areas upstream of the Abaeté River mouth and Pontal for short visits. These multiple visits were probably needed as ripe fish waited for spawning cues from a flooding Abaeté River. Some fish homed to prespawning staging areas, spawning areas, and nonspawning areas. The migratory style of zulega was dualistic, with resident and migratory fish. Total linear home range was also dualistic, with small (,26-km) and large (53-127-km) ranges. The locations of spawning areas and home ranges suggest that the Pontal group (which includes Cilga fish) is one population that occupies about 110 km. The Pontal population overlaps a short distance with a population located downstream of Cilga. Movements of late-stage TM adults suggest that the TM group is a separate population, possibly with connections to populations upstream of TMD.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Migration and Spawning of Radio‐Tagged Zulega Prochilodus argenteus in a Dammed Brazilian River

Godinho

Kynard

2006

Trans Am Fish Soc

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“…We immobilized fish for tagging in a tank filled with 150 L of river water that was frequently renewed or oxygenated. We immobilized fish in the tank using electronarcosis with non-pulsed 40-60 V DC (Kynard and Lonsdale 1975;Ross and Ross 1999), and then we reduced current to 25-40 V DC during tagging.…”

Section: Study Sitementioning

confidence: 99%

Migration and spawning of female surubim (Pseudoplatystoma corruscans, Pimelodidae) in the São Francisco river, Brazil

2006

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Surubim, Pseudoplatystoma corruscans, is the most valuable commercial and recreational fish in the Sã o Francisco River, but little is known about adult migration and spawning. Movements of 24 females (9.5-29.0 kg), which were radio-tagged just downstream of Trê s Marias Dam (TMD) at river kilometer 2,109 and at Pirapora Rapids (PR) 129 km downstream of TMD, suggest the following conceptual model of adult female migration and spawning. The tagged surubims used only 274 km of the main stem downstream of TMD and two tributaries, the Velhas and Abaeté rivers. Migration style was dualistic with non-migratory (resident) and migratory fish. Pre-spawning females swam at ground speeds of up to 31 km day -1 in late September-December to pre-spawning staging sites located 0-11 km from the spawning ground. In the spawning season (November-March), prespawning females migrated back and forth from nearby pre-spawning staging sites to PR for short visits to spawn, mostly during floods. Multiple visits to the spawning site suggest surubim is a multiple spawner. Most post-spawning surubims left the spawning ground to forage elsewhere, but some stayed at the spawning site until the next spawning season. Post-spawning migrants swam up or downstream at ground speeds up to 29 km day -1 during January-March. Construction of proposed dams in the main stem and tributaries downstream of TMD will greatly reduce surubim abundance by blocking migrations and changing the river into reservoirs that eliminate riverine spawning and non-spawning habitats, and possibly, cause extirpation of populations.

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“…Gunstrom and Bethers, 1985); others apply a short burst of relatively high voltage and the fish remains immobilized for several minutes after the electric current is discontinued (e.g. Kynard and Lonsdale (1975) found that rainbow trout could be immobilized with low voltage constant DC and held in a state of electronarcosis (muscle relaxation) for up to 3 h with no significant effect on photonegative behavior or growth. In most cases, the electricity used was either AC or pulsed DC, or was constant DC of a sufficiently high voltage that the fish were immobilized by electrotetanus, and most studies reported some fish injury and mortality (e.g.…”

Section: Introductionmentioning

confidence: 99%

Use of electronarcosis to immobilize juvenile lake and shortnose sturgeons for handling and the effects on their behavior

2002

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Experimental Study of Galvanonarcosis for Rainbow Trout (Salmo gairdneri) Immobilization

Abstract: Galvanonarcosis treatments had no significant effect on growth or photonegative behavior of rainbow trout (Salmo gairdneri). The data indicate the potential usefulness of the technique for immobilizing fish.

Cited by 29 publications

References 2 publications

Migration and Spawning of Radio‐Tagged Zulega Prochilodus argenteus in a Dammed Brazilian River

Migration and Spawning of Radio‐Tagged Zulega Prochilodus argenteus in a Dammed Brazilian River

Migration and spawning of female surubim (Pseudoplatystoma corruscans, Pimelodidae) in the São Francisco river, Brazil

Use of electronarcosis to immobilize juvenile lake and shortnose sturgeons for handling and the effects on their behavior

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