Evaluating potential age structures for three Alaska crustacean species
Thesis (M.S.) University of Alaska Fairbanks, 2019 Banding patterns are observed in calcified structures of red king crab (Paralithodes camtschaticus), snowcrab (Chionoecetes opilio), and spot shrimp (Pandalus platyceros). Recent research supports an age determination method based on these banding p...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/10532 2023-05-15T13:09:52+02:00 Evaluating potential age structures for three Alaska crustacean species Rebert, April L. Kruse, Gordon Webb, Joel Tamone, Sherry 2019-05 http://hdl.handle.net/11122/10532 en_US eng http://hdl.handle.net/11122/10532 Department of Fisheries Alaskan king crab age determination Alaska snow crab spot shrimp descapoda crustacea Thesis ms 2019 ftunivalaska 2023-02-23T21:37:31Z Thesis (M.S.) University of Alaska Fairbanks, 2019 Banding patterns are observed in calcified structures of red king crab (Paralithodes camtschaticus), snowcrab (Chionoecetes opilio), and spot shrimp (Pandalus platyceros). Recent research supports an age determination method based on these banding patterns; however, processing methodologies for these structures have not been established. Further, species-specific evidence is needed to determine whether these patterns indicate actual age or growth. The objectives of this thesis are to: (1) describe optimal species-specific methods for producing and evaluating band counts for red king crab, snow crab, and spot shrimp; and (2) use differences in shell condition to test whether band counts indicate age for snow crab. For each species, we comprehensively thin-sectioned structures, evaluated each section for banding pattern presence (readability), and developed band count criteria. To address objective 1, we used generalized additive models to describe readability across structures to find the location that optimizes the production of readable sections. For objective 2, we used a one-way ANOVA to compare band count and endocuticle measurements among shell conditions in snow crab. Results indicated preferred structures, locations, section orientation, and thickness. Results also indicated that there is no relationship between band count and shell condition for terminally molted snow crab. These results describe optimal methods for processing crustacean structures and suggest that the potential age structures may not continue to produce bands after terminal molt in the case of snow crab. Further evaluation is needed to validate potential age relationships and the use of this technique for age estimation. the North Pacific Research Board; the Saltonstall-Kennedy Grant Award; the Alaska Department of Fish and Game; the Bering Sea Fisheries Research Foundation; and the University of Alaska Chapter 1: Development of procedures for sectioning calcified hard parts as ... Thesis Alaskan king crab Bering Sea Chionoecetes opilio Paralithodes camtschaticus Red king crab Snow crab Alaska University of Alaska: ScholarWorks@UA Bering Sea Fairbanks Pacific Saltonstall ENVELOPE(-154.300,-154.300,-86.883,-86.883) |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
Alaskan king crab age determination Alaska snow crab spot shrimp descapoda crustacea |
spellingShingle |
Alaskan king crab age determination Alaska snow crab spot shrimp descapoda crustacea Rebert, April L. Evaluating potential age structures for three Alaska crustacean species |
topic_facet |
Alaskan king crab age determination Alaska snow crab spot shrimp descapoda crustacea |
description |
Thesis (M.S.) University of Alaska Fairbanks, 2019 Banding patterns are observed in calcified structures of red king crab (Paralithodes camtschaticus), snowcrab (Chionoecetes opilio), and spot shrimp (Pandalus platyceros). Recent research supports an age determination method based on these banding patterns; however, processing methodologies for these structures have not been established. Further, species-specific evidence is needed to determine whether these patterns indicate actual age or growth. The objectives of this thesis are to: (1) describe optimal species-specific methods for producing and evaluating band counts for red king crab, snow crab, and spot shrimp; and (2) use differences in shell condition to test whether band counts indicate age for snow crab. For each species, we comprehensively thin-sectioned structures, evaluated each section for banding pattern presence (readability), and developed band count criteria. To address objective 1, we used generalized additive models to describe readability across structures to find the location that optimizes the production of readable sections. For objective 2, we used a one-way ANOVA to compare band count and endocuticle measurements among shell conditions in snow crab. Results indicated preferred structures, locations, section orientation, and thickness. Results also indicated that there is no relationship between band count and shell condition for terminally molted snow crab. These results describe optimal methods for processing crustacean structures and suggest that the potential age structures may not continue to produce bands after terminal molt in the case of snow crab. Further evaluation is needed to validate potential age relationships and the use of this technique for age estimation. the North Pacific Research Board; the Saltonstall-Kennedy Grant Award; the Alaska Department of Fish and Game; the Bering Sea Fisheries Research Foundation; and the University of Alaska Chapter 1: Development of procedures for sectioning calcified hard parts as ... |
author2 |
Kruse, Gordon Webb, Joel Tamone, Sherry |
format |
Thesis |
author |
Rebert, April L. |
author_facet |
Rebert, April L. |
author_sort |
Rebert, April L. |
title |
Evaluating potential age structures for three Alaska crustacean species |
title_short |
Evaluating potential age structures for three Alaska crustacean species |
title_full |
Evaluating potential age structures for three Alaska crustacean species |
title_fullStr |
Evaluating potential age structures for three Alaska crustacean species |
title_full_unstemmed |
Evaluating potential age structures for three Alaska crustacean species |
title_sort |
evaluating potential age structures for three alaska crustacean species |
publishDate |
2019 |
url |
http://hdl.handle.net/11122/10532 |
long_lat |
ENVELOPE(-154.300,-154.300,-86.883,-86.883) |
geographic |
Bering Sea Fairbanks Pacific Saltonstall |
geographic_facet |
Bering Sea Fairbanks Pacific Saltonstall |
genre |
Alaskan king crab Bering Sea Chionoecetes opilio Paralithodes camtschaticus Red king crab Snow crab Alaska |
genre_facet |
Alaskan king crab Bering Sea Chionoecetes opilio Paralithodes camtschaticus Red king crab Snow crab Alaska |
op_relation |
http://hdl.handle.net/11122/10532 Department of Fisheries |
_version_ |
1766202207296815104 |