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Fish passage science and practice seeks to facilitate the movement of fish around obstacles in their habitat, primarily through the construction of fishways and culverts. Successful implementation of fish passage requires collaboration between groups with very different backgrounds and expertise, including knowledge-producers (scientists who study fish passage and related topics such as fish swimming ability) and knowledge users (engineers who apply that knowledge to design fish passage solutions). To investigate the nature of collaboration between these groups, we surveyed fish passage scientists and engineers from around the world. Respondents were asked about the importance of collaboration, mechanisms of collaboration, potential barriers to collaboration, and how collaboration can be improved. Both fish passage scientists and engineers reported high importance of collaboration and that they collaborated frequently with the other group. Respondents reported that consultation with other professionals (of their discipline and the other) was the most important means of obtaining and sharing information related to fish passage science and engineering. Both groups also tended to over-estimate their knowledge and use of the other's discipline. While respondents reported high engagement in collaboration, key themes emerged with respect to barriers to collaboration and means of improving collaboration. These included lacking a shared understanding of both disciplines, professional differences, insufficient institutional support, and inadequate sharing of knowledge (e.g., reporting and publishing). Opportunities for improving collaboration identified by respondents included 1) more interdisciplinary opportunities that facilitate interaction (particularly conferences and workshops); 2) promoting collaborative projects and interactions between fish passage scientists and engineers on project teams; and 3) ensuring that information is shared between groups (e.g., through accessible publications). Findings from this research have the potential to enhance collaboration between scientists and engineers, to the benefit of fish passage and fish populations., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier Ltd. All rights reserved.)

This study provides evidence of two subpopulations of Atlantic halibut (Hippoglossus hippoglossus) in the southern Gulf of St. Lawrence. The migrations of 20 Atlantic halibut captured in the coastal waters of Prince Edward Island, Canada, were evaluated using pop-up satellite archival tags (PSAT). Geolocation data showed that Atlantic halibut migrated north to the Laurentian Channel via distinct eastern or western routes. Floy tagging and recapture (recapture of 18.4%) showed that less than 7.0% of Atlantic halibut exhibited dispersive behaviour outside of their annual migratory route. Overwintering occurred on the slope and in the deepest waters of the Laurentian Channel. Atlantic halibut in the deepest waters of the Laurentian Channel exhibited rapid, ~100 m rises, presumed to be associated with spawning from January to March. The eastern and western migratory cohorts exhibited this behaviour ~350 km apart, suggesting reproductive isolation as the basis of subpopulations. The results of this study indicate a need to reconsider the management of Gulf of St. Lawrence Atlantic halibut as one continuous population. L'etude presente des preuves de la presence de deux sous-populations de fletans de l'Atlantique (Hippoglossus hippoglossus) dans le sud du golfe du Saint-Laurent. Les migrations de 20 fletans captures dans les eaux cotieres de rIle-du-Prince- Edouard (Canada) ont ete evaluees a l'aide d'etiquettes emettrices detachables (EED). Les donnees de geolocalisation montrent que les fletans migraient vers le nord jusqu'au chenal Laurentien par des voies est et ouest distinctes. Des donnees de recapture d'etiquettes Floy (18,4 % de recapture) montrent que moins de 7,0 % des fletans presentaient un comportement de dispersion en dehors de leur voie de migration annuelle. Les fletans passaient l'hiver sur la pente et dans les eaux les plus profondes du chenal Laurentien. Les fletans dans les eaux les plus profondes du chenal Laurentien effectuaient des remontees rapides de ~100 m, possiblement associees au frai de janvier a mars. Les cohortes migratrices est et ouest presentaient ce comportement a ~350 km de distance l'une de l'autre, donnant a penser que l'isolement aux fins de la reproduction est a l'origine des sous- populations. Les resultats de l'etude font ressortir la necessite de revoir l'approche de gestion du fletan de l'Atlantique dans le golfe du SaintLaurent basee sur une seule population continue. [Traduit par la Redaction], Introduction Observing how fish move across time and space can help define the boundaries of a population, improve our understanding of how adjacent populations interact, uncover critical times or regions [...]

This study examined the migratory patterns of introduced rainbow trout (Oncorhynchus mykiss) in three rivers in Prince Edward Island, Canada, using acoustic telemetry and otolith microchemistry. Only 6% of acoustically tagged fish in three river systems left coastal embayments. A cohort of rainbow trout in all three rivers entered saline waters. Habitat use differed among migrants in the three rivers, as Montague River fish occupied estuary habitat (mean 20.79 PSU) more often than West River and Dunk River fish that tended to occupy both riverine tidal (mean 1.27 and 4.29 PSU, respectively) and freshwater habitats ( L'etude se penche sur les habitudes migratoires de truites arc-en-ciel (Oncorhynchus mykiss) introduites dans trois rivieres de llle-du-Prmce-Edouard (Canada) en utilisant la telemetrie acoustique et la microchimie des otolites. Seuls 6 % des poissons dotes d'etiquettes acoustiques dans les trois reseaux hydrographiques ont quitte les echancrures cotieres. Une cohorte de truites arc-en-ciel dans chacune des trois rivieres est entree en eaux salees. L'utilisation de l'habitat variait entre les migrants des trois rivieres, les poissons de la riviere Montague occupant un habitat estuarien (20,79 USP en moyenne) plus souvent que les poissons des rivieres West et Dunk, qui avaient tendance a occuper des habitats fluviaux tidaux (1,27 et 4,29 USP en moyenne, respectivement) et d'eau douce (, Introduction Rainbow trout (Oncorhynchus mykiss) have been introduced to over 90 countries (MacCrimmon 1971; Crawford and Muir 2008), as the species is a valued recreational angling target. However, their impacts [...]

We evaluated passage of Osmerus mordax (Rainbow Smelt), Salvelinus fontinalis (Brook Trout), and Alosa pseudoharengus (Alewife) at 4 fishways on Prince Edward Island, Canada. We implanted fish with passive integrated transponder (PIT) tags and recorded their movements using stationary PIT antennas. Passage at different fishway types was highly variable. Nature-like fishways passed over 96% of Brook Trout and a maximum of 41.8% of Rainbow Smelt. The latter percentage is the highest yet reported in the literature for Rainbow Smelt. Pool-and-weir fishways passed nearly 100% of Brook Trout, 13.2% of Rainbow Smelt, and only 5.6% of Alewife. After passing a fishway, upstream residency was highly variable both among species as well as among individuals within species. Rainbow Smelt were observed spawning within nature-like fishways, suggesting that this type of fishway may also provide spawning habitat. Results highlight the challenge of passing non-salmonid species and indicate nature-like fishways are more appropriate than technical designs for passing Rainbow Smelt. [ABSTRACT FROM AUTHOR]