Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | What's the effectiveness of stocking actions in small creeks? The role of water discharge behind hatchery trout downstream movement |
| Abstract | Fish stocking to enhance freshwater fisheries or to improve the conservation status of endangered fish species is a common practice in many countries. Little is known, however, of the effectiveness of these practices in spite of the high efforts and investments required. The movement of subadult/adult hatchery-released brown trout Salmo trutta L. was studied by passive telemetry in a small tributary of Lake Lugano (i.e., Laveggio Creek, Canton Ticino, Switzerland). Hatchery fish, together with some resident wild individuals sampled during electrofishing surveys, were tagged with Passive Integrated Transponders (PIT) tags. Hatchery fish were released upstream and downstream a submersible monitoring antenna, which was anchored to the streambed in a pass-over orientation. The number of hatchery fish detected daily by the antenna (divided between fish released upstream and downstream the antenna) was analyzed in relation to the daily water discharge, to search for similar patterns in their fluctuation over time. Only the movement of fish released upstream the antenna displayed a significant relationship with water discharge, with the highest number of fish detected during periods of high-water flow, occurring after heavy rains. High-water discharge events had a significant role in hatchery trout downstream movement in our study site, likely acting as a driver for the downstream migration to Lake Lugano. Such events contributed to the poor effectiveness of stocking actions in this small tributary, providing further evidence against stocking strategies based on subadult/adult fish. |
| Source | PeerJ 10 |
| Keywords | Brown troutFish movementFish stockingFish telemetryPassive integrated transponder (PIT)Stock enhancement |
| Journal | PeerJ |
| Editor | , , |
| Year | 2022 |
| Type | Articolo in rivista |
| DOI | 10.7717/peerj.14069 |
| Authors | Brignone, Stefano; De Santis, Vanessa; Putelli, Tiziano; Molina, Christophe; Piccinini, Armando; Carmichael, Richard A.; Volta, Pietro |
| Text | 472356 2022 10.7717/peerj.14069 Scopus 2 s2.0 85139623146 Brown trout Fish movement Fish stocking Fish telemetry Passive integrated transponder PIT Stock enhancement What s the effectiveness of stocking actions in small creeks The role of water discharge behind hatchery trout downstream movement Brignone, Stefano; De Santis, Vanessa; Putelli, Tiziano; Molina, Christophe; Piccinini, Armando; Carmichael, Richard A.; Volta, Pietro Repubblica e Cantone Ticino; Biomark; National Research Council CNR IRSA Fish stocking to enhance freshwater fisheries or to improve the conservation status of endangered fish species is a common practice in many countries. Little is known, however, of the effectiveness of these practices in spite of the high efforts and investments required. The movement of subadult/adult hatchery released brown trout Salmo trutta L. was studied by passive telemetry in a small tributary of Lake Lugano i.e., Laveggio Creek, Canton Ticino, Switzerland . Hatchery fish, together with some resident wild individuals sampled during electrofishing surveys, were tagged with Passive Integrated Transponders PIT tags. Hatchery fish were released upstream and downstream a submersible monitoring antenna, which was anchored to the streambed in a pass over orientation. The number of hatchery fish detected daily by the antenna divided between fish released upstream and downstream the antenna was analyzed in relation to the daily water discharge, to search for similar patterns in their fluctuation over time. Only the movement of fish released upstream the antenna displayed a significant relationship with water discharge, with the highest number of fish detected during periods of high water flow, occurring after heavy rains. High water discharge events had a significant role in hatchery trout downstream movement in our study site, likely acting as a driver for the downstream migration to Lake Lugano. Such events contributed to the poor effectiveness of stocking actions in this small tributary, providing further evidence against stocking strategies based on subadult/adult fish. 10 Published version http //www.scopus.com/record/display.url eid=2 s2.0 85139623146 origin=inward Articolo in rivista 2167 8359 PeerJ PeerJ BRIGNONE STEFANO vanessadesantis DE SANTIS VANESSA pietro.volta VOLTA PIETRO |