Replacement of the typical artedi form of Coregonus artedi in Lake Huron by endemic shallow‐water Ciscoes, including putative hybrids

2021 ◽  
Author(s):  
Randy L. Eshenroder ◽  
Yu‐Chun Kao ◽  
Timothy P. O’Brien ◽  
Chris M. Olds ◽  
Chris L. Davis ◽  
...  
Keyword(s):  
Shallow Water ◽  
Lake Huron ◽  
Coregonus Artedi ◽  
Putative Hybrids

scholarly journals How Many Ciscoes are Needed for Stocking in the Laurentian Great Lakes?

2021 ◽  
Author(s):  
Benjamin Rook ◽  
Michael J. Hansen ◽  
Charles R. Bronte
Keyword(s):  
Great Lakes ◽  
Lake Michigan ◽  
Lake Superior ◽  
Production Capacity ◽  
Lake Huron ◽  
Laurentian Great Lakes ◽  
Saginaw Bay ◽  
Thunder Bay ◽  
Western Lake ◽  
Coregonus Artedi

Historically, Cisco Coregonus artedi and deepwater ciscoes Coregonus spp. were the most abundant and ecologically important fish species in the Laurentian Great Lakes, but anthropogenic influences caused nearly all populations to collapse by the 1970s. Fishery managers have begun exploring the feasibility of restoring populations throughout the basin, but questions regarding hatchery propagation and stocking remain. We used historical and contemporary stock-recruit parameters previously estimated for Ciscoes in Wisconsin waters of Lake Superior, with estimates of age-1 Cisco rearing habitat (broadly defined as total ha ≤ 80 m depth) and natural mortality, to estimate how many fry (5.5 months post-hatch), fall fingerling (7.5 months post-hatch), and age-1 (at least 12 months post-hatch) hatchery-reared Ciscoes are needed for stocking in the Great Lakes to mimic recruitment rates in Lake Superior, a lake that has undergone some recovery. Estimated stocking densities suggested that basin-wide stocking would require at least 0.641-billion fry, 0.469-billion fall fingerlings, or 0.343-billion age-1 fish for a simultaneous restoration effort targeting historically important Cisco spawning and rearing areas in Lakes Huron, Michigan, Erie, Ontario, and Saint Clair. Numbers required for basin-wide stocking were considerably greater than current or planned coregonine production capacity, thus simultaneous stocking in the Great Lakes is likely not feasible. Provided current habitat conditions do not preclude Cisco restoration, managers could maximize the effectiveness of available production capacity by concentrating stocking efforts in historically important spawning and rearing areas, similar to the current stocking effort in Saginaw Bay, Lake Huron. Other historically important Cisco spawning and rearing areas within each lake (listed in no particular order) include: (1) Thunder Bay in Lake Huron, (2) Green Bay in Lake Michigan, (3) the islands near Sandusky, Ohio, in western Lake Erie, and (4) the area near Hamilton, Ontario, and Bay of Quinte in Lake Ontario. Our study focused entirely on Ciscoes but may provide a framework for describing future stocking needs for deepwater ciscoes.

NITROGEN AND ARGON IN SALMONOID SWIMBLADDERS

1956 ◽  
Vol 34 (1) ◽  
pp. 58-62 ◽  
Author(s):  
J. S. Tait
Keyword(s):  
Shallow Water ◽  
Lake Trout ◽  
Lake Huron ◽  
Inert Gases ◽  
Lake Whitefish ◽  
Trout Lake ◽  
Combustible Gas

Analyses of 44 swimbladder gas samples from lake trout, lake whitefish, shallow-water cisco, deepwater cisco, and bloater caught at 60–300 ft. in Lake Huron showed no measurable quantities of combustible gas. Noncombustible gas ranged from 90 to 98%. The argon × 100/nitrogen in a gas sample from a whitefish was 1.02, virtually the same as in air. The noncombustible gas is composed apparently of the inert gases of the atmosphere.

Status of cisco (Coregonus artedi) ecomorphs in Lake Huron, 1917-2016, with speculations about phenotypic plasticity in shorthead cisco

2021 ◽  
Vol 66 ◽  
pp. 383-402
Author(s):  
Randy L. Eshenroder ◽  
Chris M. Olds ◽  
Yu-Chun Kao ◽  
Chris L. Davis ◽  
Devin N. Kinney ◽  
...  
Keyword(s):  
Phenotypic Plasticity ◽  
Lake Huron ◽  
Coregonus Artedi

Spatial assemblage structure of shallow-water reef fish in Southwest Australia

2020 ◽  
Vol 649 ◽  
pp. 125-140
Author(s):  
DS Goldsworthy ◽  
BJ Saunders ◽  
JRC Parker ◽  
ES Harvey
Keyword(s):  
Shallow Water ◽  
Reef Fish ◽  
Marine Environment ◽  
Fish Assemblages ◽  
Canopy Cover ◽  
Reef Fishes ◽  
Reef Fish Assemblage ◽  
Reef Type ◽  
Present Distribution ◽  
Southwest Australia

Bioregional categorisation of the Australian marine environment is essential to conserve and manage entire ecosystems, including the biota and associated habitats. It is important that these regions are optimally positioned to effectively plan for the protection of distinct assemblages. Recent climatic variation and changes to the marine environment in Southwest Australia (SWA) have resulted in shifts in species ranges and changes to the composition of marine assemblages. The goal of this study was to determine if the current bioregionalisation of SWA accurately represents the present distribution of shallow-water reef fishes across 2000 km of its subtropical and temperate coastline. Data was collected in 2015 using diver-operated underwater stereo-video surveys from 7 regions between Port Gregory (north of Geraldton) to the east of Esperance. This study indicated that (1) the shallow-water reef fish of SWA formed 4 distinct assemblages along the coast: one Midwestern, one Central and 2 Southern Assemblages; (2) differences between these fish assemblages were primarily driven by sea surface temperature, Ecklonia radiata cover, non-E. radiata (canopy) cover, understorey algae cover, reef type and reef height; and (3) each of the 4 assemblages were characterised by a high number of short-range Australian and Western Australian endemic species. The findings from this study suggest that 4, rather than the existing 3 bioregions would more effectively capture the shallow-water reef fish assemblage patterns, with boundaries having shifted southwards likely associated with ocean warming.

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