Abstract:Fish stocking is a common management strategy in Brazil, yet no assessment has examined its real extent and features. The present work investigated fish stocking practices in Brazil between 2010 and 2019 to characterize propagule pressure, species composition, the use of non-native species, geographical and temporal trends, environment types, and responsible agencies. Based on information disseminated on the internet, the study detected 1,155 stocking events (ca. 115 events/year). In total, ca. 56.4 million fi… Show more
“…Stocking is used worldwide to supplement and/or sustain desired fish communities (Miranda, 2001). However, there are a myriad of biotic and abiotic factors that can drive population dynamics in these systems (Hunt & Jones, 2018; Pelissoli et al., 2023), including loss of individuals through entrainment (Li et al., 2024). Direct management of entrainment through construction of barriers or deterrents may be more effective for bolstering reservoir native (see Jesus et al., 2021 for review) and sport fish populations in situations where entrainment is known to be a large source of individual loss (Fish Guidance Systems Ltd and Hydro Energy Developments Limited, 1996; Weber & Flammang, 2019).…”
Abundance of adult walleye (Sander vitreus) and sauger (Sander canadensis), two important sport fishes, decreased significantly during 2001–2022 in Lewis and Clark Lake, a border water between Nebraska and South Dakota, despite walleye fingerling stocking and stable age‐0 abundance of both species. We sought to identify factors that drove variation in age‐0 abundance from 2001 to 2022 using an information theoretic approach. Age‐0 walleye catch per unit effort (CPUE) was correlated to mean monthly outflow, mean annual precipitation, and mean April gauge height in a delta. Age‐0 sauger CPUE was correlated to adult conspecific CPUE, mean April Heating Degree Days, and mean annual precipitation. Our findings suggest that both biotic and abiotic factors were important for explaining variation in age‐0 CPUE of sauger, but mainly abiotic factors for walleye. As such, manipulation of abiotic factors (i.e., outflow) by installing entrainment barriers may be more effective than manipulation of biotic factors (i.e., stocking).
“…Stocking is used worldwide to supplement and/or sustain desired fish communities (Miranda, 2001). However, there are a myriad of biotic and abiotic factors that can drive population dynamics in these systems (Hunt & Jones, 2018; Pelissoli et al., 2023), including loss of individuals through entrainment (Li et al., 2024). Direct management of entrainment through construction of barriers or deterrents may be more effective for bolstering reservoir native (see Jesus et al., 2021 for review) and sport fish populations in situations where entrainment is known to be a large source of individual loss (Fish Guidance Systems Ltd and Hydro Energy Developments Limited, 1996; Weber & Flammang, 2019).…”
Abundance of adult walleye (Sander vitreus) and sauger (Sander canadensis), two important sport fishes, decreased significantly during 2001–2022 in Lewis and Clark Lake, a border water between Nebraska and South Dakota, despite walleye fingerling stocking and stable age‐0 abundance of both species. We sought to identify factors that drove variation in age‐0 abundance from 2001 to 2022 using an information theoretic approach. Age‐0 walleye catch per unit effort (CPUE) was correlated to mean monthly outflow, mean annual precipitation, and mean April gauge height in a delta. Age‐0 sauger CPUE was correlated to adult conspecific CPUE, mean April Heating Degree Days, and mean annual precipitation. Our findings suggest that both biotic and abiotic factors were important for explaining variation in age‐0 CPUE of sauger, but mainly abiotic factors for walleye. As such, manipulation of abiotic factors (i.e., outflow) by installing entrainment barriers may be more effective than manipulation of biotic factors (i.e., stocking).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.