Variation of cisco egg size among Laurentian Great Lakes populations

Koenigbauer, Scott; Yule, Dan L.; Dey, Kaushik; Olds, Chris; Connerton, Michael J.; Höök, Tomas O.

doi:10.1016/j.jglr.2022.03.006

Cited by 1 publication

(2 citation statements)

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“…Egg diameter differences among and within Coregonus species appear to be related to environmental and maternal size differences (Koenigbauer et al 2022), but we did not find any evidence for maternal size differences in our 2019–2021 Kiyi collections. Preservation methods and whether the eggs were fertilized or unfertilized can also influence reported egg diameters, with shrinking known to occur with ethanol (Koenigbauer et al 2022) and smaller reported sizes for unfertilized eggs. The smaller eggs of Kiyi might provide new challenges for hatcheries that are accustomed to working with species that produce larger eggs.…”

Section: Discussioncontrasting

confidence: 83%

“…Our mean Kiyi egg diameter (1.7 mm) was smaller than that reported for Lake Michigan Bloater (~2.0 mm; Emery and Brown 1978;Bunnell et al 2009) and Cisco (1.9 mm; Smith 1956); Lake Superior Cisco (1.9-2.1 mm; Dryer and Beil 1964;Booke 1970) and Bloater (1.9-2.0 mm; Dryer and Beil 1968); and Lake Ontario Cisco (2.5 mm; Paufve et al 2020). Egg diameter differences among and within Coregonus species appear to be related to environmental and maternal size differences (Koenigbauer et al 2022), but we did not find any evidence for maternal size differences in our 2019-2021 Kiyi collections. Preservation methods and whether the eggs were fertilized or unfertilized can also influence reported egg diameters, with shrinking known to occur with ethanol (Koenigbauer et al 2022) and smaller reported sizes for unfertilized eggs.…”

Section: Discussionmentioning

confidence: 98%

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Lake Superior Kiyi reproductive biology

et al. 2023

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Objective The Lake Superior Kiyi Coregonus kiyi is an understudied species being considered for reintroduction into Laurentian Great Lakes where it no longer occurs. Herein, we provide descriptions of Kiyi reproductive biology with the intention of guiding potential gamete collections for propagation. Methods Data were collected on Kiyi spawning timing, spawning locations, spawning season catch rates, length at sexual maturity, sex ratios, fecundity, egg size, and larval occurrences in Lake Superior from 1996–2021. These data were compared to observations made a century prior in Lakes Michigan, Ontario, and Superior. Result Contemporary Kiyi spawning occurred between late December and late January when surface water temperatures cooled to <4°C. Spawning Kiyi were caught almost exclusively in 38.1‐mm stretch mesh, as compared to larger meshes (50.8–76.2 mm). Capture depths for developing, ripe, running, and spent female Kiyi were similar and ranged from 82 to 221 m. Fifty percent of female and male Kiyi were classified as sexually mature at ~150 mm total length. Fecundity estimates ranged from 1,578 to 6,720 eggs/female. Mean diameter of unfertilized eggs was 1.7 mm. Recently hatched larval Kiyi were collected at the surface during May–July at 62 of the 113 locations sampled throughout the lake in 2019. Conclusion Our work suggests that Kiyi gamete collection efforts from mid‐December through January using 38.1‐mm gill‐net panels set at bathymetric depths of at least 100 m would maximize the collection of spawning Kiyi and reduce the bycatch of other Coregonus species. Future research questions include the following: (1) “Do Kiyi form spawning aggregations at specific spawning areas, or do they spawn indiscriminately across the lake?”; (2) “Do Kiyi spawn near the bottom or up in the water column?”; (3) “What is the relationship between fall lake overturn and Kiyi spawn timing?”; and (4) “Could summer larval and age‐0 Kiyi collections provide an opportunity for establishing a captive broodstock?”

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Section: Discussioncontrasting

confidence: 83%