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1. Drivers of recruitment dynamics in Japanese major fisheries resources: Effects of environmental conditions and spawner abundance

Author:
Szuwalski, Cody S.,   et al.   ; Kurota, Hiroyuki; Ichinokawa, Momoko;     Show all 3 Authors
Source:
Fisheries research 2020 v.221 pp. 105353
ISSN:
0165-7836
Subject:
environmental factors; environmental impact; fish; fish communities; fisheries; fishery resources; life history; species recruitment; time series analysis; uncertainty; Japan
Abstract:
... Identifying driving factors of recruitment dynamics is essential for understanding population dynamics of fisheries resources and managing them sustainably. Spawner abundance and environmental conditions have been assumed as driving factors of recruitment, and the relative influence of these two drivers in fish populations has been debated for a long time. We addressed this issue by applying cross ...
DOI:
10.1016/j.fishres.2019.105353

2. Global forage fish recruitment dynamics: A comparison of methods, time-variation, and reverse causality

Author:
Szuwalski, Cody S.,   et al.   ; Britten, Gregory L.; Licandeo, Roberto; Amoroso, Ricardo O.; Hilborn, Ray; Walters, Carl;     Show all 6 Authors
Source:
Fisheries research 2019 v.214 pp. 56-64
ISSN:
0165-7836
Subject:
autocorrelation; biomass; forage fish; life history; linear models; spawning; species recruitment; temporal variation
Abstract:
... The population dynamics of forage fish are often ‘boom or bust’, and variation in recruitment may be a contributing factor to changes in abundance. Here we applied several methods for identifying stock recruit relationships (SRR) to 52 forage fish stocks: a time-invariant Ricker model and two time-varying methods (dynamic linear models and regime-based models). A positive relationship between spaw ...
DOI:
10.1016/j.fishres.2019.01.007

3. Global fishery dynamics are poorly predicted by classical models

Author:
Szuwalski, Cody S,   et al.   ; Thorson, James T;     Show all 2 Author
Source:
Fish and fisheries 2017 v.18 no.6 pp. 1085-1095
ISSN:
1467-2960
Subject:
biomass; databases; fisheries; habitats; managers; marine ecosystems; models; mortality; protein synthesis; risk; spawning
Abstract:
... Fisheries dynamics can be thought of as the reciprocal relationship between an exploited population and the fishers and/or managers determining the exploitation patterns. Sustainable production of protein of these coupled human‐natural systems requires an understanding of their dynamics. Here, we characterized the fishery dynamics for 173 fisheries from around the globe by applying general additiv ...
DOI:
10.1111/faf.12226

4. Can an aggregate assessment reflect the dynamics of a spatially structured stock? Snow crab in the eastern Bering Sea as a case study

Author:
Szuwalski, Cody S.,   et al.   ; Punt, André E.;     Show all 2 Author
Source:
Fisheries research 2015 v.164 pp. 135-142
ISSN:
0165-7836
Subject:
Chionoecetes opilio; case studies; data collection; ice; models; mortality; ontogeny; surveys; winter; Bering Sea
Abstract:
... The snow crab population in the eastern Bering Sea is panmictic, but it is spatially structured by inferred ontogenetic migrations, and fishing pressure is often spatially restricted by sea ice. This spatial structure is ignored when stock assessments are conducted, yet it is unclear if this omission influences management outcomes. We describe a process for evaluating the influence of spatial stru ...
DOI:
10.1016/j.fishres.2014.10.020

5. An integrated stock assessment for red spiny lobster (Panulirus penicillatus) from the Galapagos Marine Reserve

Author:
Szuwalski, Cody S.,   et al.   ; Castrejon, Mauricio; Ovando, Dan; Chasco, Brandon;     Show all 4 Authors
Source:
Fisheries research 2016 v.177 pp. 82-94
ISSN:
0165-7836
Subject:
Panulirus penicillatus; biomass; data collection; ecosystems; fisheries; lobsters; monitoring; mortality; profitability; spawning; uncertainty; Galapagos Islands
Abstract:
... The population of red spiny lobster (Panulirus penicillatus) around the Galapagos Islands has supported a fishery since the 1960s. However, conservation concerns have been raised given signs of over-exploitation observed during the mid-2000s, including decreasing trends in catch per unit effort (CPUE), yield, and profitability. We developed an integrated, size-structured assessment method to estim ...
DOI:
10.1016/j.fishres.2016.01.002

6. Describing ecosystem contexts with single‐species models: a theoretical synthesis for fisheries

Author:
Szuwalski, Cody S,   et al.   ; Burgess, Matthew G; Giacomini, Henrique C; Costello, Christopher; Gaines, Steven D;     Show all 5 Authors
Source:
Fish and fisheries 2017 v.18 no.2 pp. 264-284
ISSN:
1467-2960
Subject:
ecosystems; fisheries; mathematics; models; population dynamics; prioritization; schools of fish
Abstract:
... Fished populations exist within complex ecosystems but are typically assessed using single‐species models. It is often lamented that stock assessments rarely account for other ecosystem components explicitly, but in most fisheries there are clear difficulties in implementing data‐intensive ecosystem‐based assessment approaches. Addressing these competing challenges requires prioritizing investment ...
DOI:
10.1111/faf.12179

7. Challenges to Reintroduction of a Captive Population of Topeka Shiner (Notropis topeka) into Former Habitats in Kansas

Author:
Szuwalski, Cody S.,   et al.   ; Campbell, Scott W.; Tabor, Vernon M.; deNoyelles, Frank;     Show all 4 Authors
Source:
Transactions of the Kansas Academy of Science 2016 v.119 no.1 pp. 83-92
ISSN:
0022-8443
Subject:
Lepomis cyanellus; Micropterus salmoides; Notropis; adults; farm ponds; fish; habitat destruction; habitats; reproduction; rivers; spawning; streams; surface water; water flow; watersheds; Great Plains region; Kansas
Abstract:
... Topeka Shiners (Notropis topeka) representing two genetically distinct and geographically separated Kansas populations have been under continuous culture and study in 0.045-ha experimental ponds at the University of Kansas Field Station since 2002. Experiments in earthen ponds undertaken from 2002 to 2009 established that Topeka Shiners are capable of surviving and reproducing in static artificial ...
DOI:
10.1660/062.119.0112

8. An evaluation of stock–recruitment proxies and environmental change points for implementing the US Sustainable Fisheries Act

Author:
Szuwalski, Cody S.,   et al.   ; Punt, André E.; Stockhausen, William;     Show all 3 Authors
Source:
Fisheries research 2014 v.157 pp. 28-40
ISSN:
0165-7836
Subject:
biomass; crabs; environmental factors; fish; males; overfishing; sustainable fisheries; uncertainty; Aleutian Islands; Bering Sea; United States
Abstract:
... The US Sustainable Fisheries Act requires overfishing limits for all managed stocks and evaluations of whether stocks are in overfished status or subject to overfishing. Overfishing is defined relative to the exploitation rate corresponding to MSY, FMSY, while being in an overfished state relates to stock biomass relative to the biomass corresponding to MSY, BMSY. FMSY and BMSY are impossible to e ...
DOI:
10.1016/j.fishres.2014.03.015

9. Examining common assumptions about recruitment: a meta‐analysis of recruitment dynamics for worldwide marine fisheries

Author:
Szuwalski, Cody S,   et al.   ; Vert‐Pre, Katyana A; Punt, André E; Branch, Trevor A; Hilborn, Ray;     Show all 5 Authors
Source:
Fish and fisheries 2015 v.16 no.4 pp. 633-648
ISSN:
1467-2960
Subject:
adults; biomass; climate change; databases; ecosystems; fish; fisheries management; managers; marine fisheries; meta-analysis; scientists; spawning; species recruitment
Abstract:
... Assumptions about the future productivity of a stock are necessary to calculate sustainable catches in fisheries management. Fisheries scientists often assume the number of young fish entering a population (recruitment) is related to the biomass of spawning adults and that recruitment dynamics do not change over time. Thus, managers often use a target biomass based on spawning biomass as the basis ...
DOI:
10.1111/faf.12083