Together, these projects optimized the design of the telemetry array, guided the tag selection for adult and juvenile Walleye, and provided insight on the performance of larger tags that could be used in other species (e.g., Muskellunge ( Esox masquinongy). Findings indicate that (1) detection range is variable across habitat types, with the largest detection range observed over sand and the smallest over silt (2) the spacing of receivers based on the largest detection range in a habitat resulted in a gridded array with receivers spaced apart by 3 km (minimal/no overlap in the detection range around each receiver) (3) signals from larger tags (e.g., V16) traveled farther than the signal from smaller tags (e.g., V7) (4) setting the tag on low or high power did not considerably increase signal transmission distance, but the high power setting did shorten the life span of the battery and (5) the performance of juvenile Walleye (>180 mm) implanted with a V7 acoustic tag was not altered. Phenological parameters and densities of shoots utihzed in flume experiments. Only small, juvenile plants (total length less than 16 cm Table l), were selected for flume experiments. Lastly, we evaluated the survival, condition, swimming performance, and wound healing of juvenile Walleye that had Vemco V7 tags surgically implanted into their coelomic cavity compared to fish that did not receive a tag. shoots 2.6 cm) the in situ Zostera Re was 80000. Next, we used range test data to conduct a random swim simulation through a virtual gridded receiver array to determine how frequently we would hear from each tag and power combination. To do this, we conducted range tests using Vemco V7, V13, and V16 acoustic tags in four habitat types: sand, boulder, boulder and cobble, and silt. The objectives of our pilot study were to (1) evaluate the range of different acoustic tag types on two power settings in different habitat types, (2) determine the optimal spacing of receivers in a gridded array and evaluate the performance of tags in this virtual array, and (3) determine if acoustic tags implanted in juvenile Walleye affected the fish. Here, we discuss the approaches used to design a study to assess the thermal niche of juvenile and adult Walleye ( Stizostedion vitreum) across time and space in Mille Lacs Lake in the 1837 Ceded Territory in Minnesota. Passive acoustic telemetry is more frequently being used by resource managers and researchers to understand the movements, distribution, and interactions of aquatic organisms.
0 kommentar(er)
