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Full-Text Articles in Life Sciences
Comparing Independent Approaches To Estimate Age At Size Of The Jonah Crab (Cancer Borealis): Corroborating Gastric Mill Band Counts As A Direct Aging Method, Carlton Huntsberger
Comparing Independent Approaches To Estimate Age At Size Of The Jonah Crab (Cancer Borealis): Corroborating Gastric Mill Band Counts As A Direct Aging Method, Carlton Huntsberger
Electronic Theses and Dissertations
Knowing the age of an organism is essential in understanding the dynamics and management of wild populations. Age determination has been an especially long-standing challenge in the study of crustaceans, since they posed a unique challenge, shedding all calcified structures with each molt. The Jonah crab (Cancer borealis), is one of many commercially harvested crustaceans for which no absolute aging method has yet been established. It is an ecologically important species and a newly managed fishery in New England and Atlantic Canada. The recent increase of commercial fisheries for this species has highlighted the large data gap of …
Assessment Of A Hatchery Based Rainbow Smelt Supplementation Effort, Andrew O'Malley
Assessment Of A Hatchery Based Rainbow Smelt Supplementation Effort, Andrew O'Malley
Electronic Theses and Dissertations
Rainbow Smelt (Osmerus mordax) are an important fish distributed throughout northeastern North America with both anadromous and landlocked populations. Abundance, size at age, and maximum size vary widely among populations and life histories. In order to compare anadromous and landlocked populations, we collected spawning adults in 2014 from four anadromous and three landlocked populations. Scales and otoliths from the anadromous fish were examined and compared for estimates of bias and precision in ageing. Analysis of both scales and otoliths provided age estimates that were acceptable, but estimates from scales were more precise and had less bias. Otoliths were …