Otolith chemistry as a fisheries management tool after flooding: The case of Missouri River gizzard shad

2018 ◽  
Vol 34 (3) ◽  
pp. 270-278 ◽  
Author(s):  
W.J. Radigan ◽  
A.K. Carlson ◽  
M.J. Fincel ◽  
B.D.S. Graeb
Keyword(s):  
Fisheries Management ◽  
Missouri River ◽  
Management Tool ◽  
Gizzard Shad ◽  
Otolith Chemistry

Elemental signatures in otoliths of hatchery rainbow trout (Oncorhynchus mykiss): distinctiveness and utility for detecting origins and movement

2009 ◽  
Vol 66 (4) ◽  
pp. 513-524 ◽  
Author(s):  
Daniel K. Gibson-Reinemer ◽  
Brett M. Johnson ◽  
Patrick J. Martinez ◽  
Dana L. Winkelman ◽  
Alan E. Koenig ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Water Chemistry ◽  
Fisheries Management ◽  
Valuable Insight ◽  
Otolith Chemistry ◽  
Considerable Potential ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
The Relationship ◽  
Ambient Levels

Otolith chemistry in freshwater has considerable potential to reveal patterns of origin and movement, which would benefit traditional fisheries management and provide a valuable tool to curb the spread of invasive and illicitly stocked species. We evaluated the relationship between otolith and water chemistry for five markers (Ba/Ca, Mn/Ca, Sr/Ca, Zn/Ca, and 87Sr/86Sr) in rainbow trout ( Oncorhynchus mykiss ) using the existing hatchery system in Colorado and Wyoming, USA, to provide controlled, seminatural conditions. Otolith Ba/Ca, Sr/Ca, and 87Sr/86Sr reflected ambient levels, whereas Mn/Ca and Zn/Ca did not. Using only the markers correlated with water chemistry, we classified fish to their hatchery of origin with up to 96% accuracy when element and isotope data were used together. Large changes in 87Sr/86Sr were evident in otolith transects, although subtler changes in Sr/Ca were also detectable. Our results suggest the relatively few otolith markers that reflect ambient chemistry can discriminate among locations and track movements well enough to provide valuable insight in a variety of applied contexts.

Individual transferable quotas as a fisheries management tool

1995 ◽  
Vol 3 (2) ◽  
pp. 141-169 ◽  
Author(s):  
Dale Squires ◽  
James Kirkley ◽  
Clement A. Tisdell
Keyword(s):  
Fisheries Management ◽  
Management Tool ◽  
Individual Transferable Quotas

scholarly journals Effectiveness of Adaptive Real-Time Closures for Managing Migratory Species in Data-Limited Multispecies Fisheries

2021 ◽  
Vol 34 (4) ◽  
Author(s):  
MASAMI MUNEHARA ◽  
◽  
METHEE KAEWNERN ◽  
PAVAROT NORANARTTRAGOON ◽  
TAKASHI FRITZ MATSUISHI
Keyword(s):  
Real Time ◽  
Fisheries Management ◽  
Single Species ◽  
Management Tool ◽  
Migratory Species ◽  
Sensitive Species ◽  
Trade Off ◽  
Multispecies Fisheries ◽  
Relative Value ◽  
The Mean

Fixed closure (FC) is a standard fisheries management tool for protecting sensitive species or species requiring conservation. However, an FC might not effectively manage migratory species because of the large uncertainties of their migration. Adaptive real-time closure (ARTC) is a tool that updates closure areas according to the latest information. This study aimed to evaluate the effectiveness of ARTC to conserve sensitive species for data-limited fisheries by a series of simulations using migration models with hotspots. In the single species simulation, the conservation ratio for the sensitive species in FC varies widely at greater migration uncertainty. In ARTC, a longer duration of a hotspot resulted in a higher conservation ratio. When the mean duration of hotspots was medium or long, the conservation ratio for the sensitive species was more than 50 % in more than 99 % of the simulation trials. In multispecies fisheries, a clear trade-off was observed between the conservation ratio of sensitive species and other species. ARTC was more effective than whole closure when the proportion of sensitive species was high or without closure when the proportion was low. Conditions in which ARTC was most appropriate were described for hotspot duration, increased numbers of individuals in a hotspot, and the relative value of conservation, representing the ratio of the value of conserving sensitive species to one of catching other species.

Status, Distribution, and Conservation of Native Freshwater Fishes of Western North America

2007 ◽  
Keyword(s):  
Genetic Diversity ◽  
Fisheries Management ◽  
Great Plains ◽  
Fish Assemblages ◽  
Missouri River ◽  
Large Rivers ◽  
Conservation Value ◽  
Clear Water ◽  
Habitat Alterations ◽  
Riverine Habitats

ABSTRACT Of 55 fish species that were likely native to the Great Plains region of Montana, Wyoming, and Colorado, 33 (60%) species have been given some kind of conservation designation by at least one of the state fisheries management agencies because they are rare or in decline. The species with conservation designations were generally fishes that inhabit large rivers of the upper Missouri River drainage (14 species); live in small, cool- or clear-water streams (9 species); or reside in a wide array of habitats but occur at the edge of their ranges in individual states (10 species). Changes in riverine habitats due to construction of reservoirs on large rivers and introduction of exotic piscivorous fishes to reservoirs are major causes of decline of riverine species in the Great Plains region of Montana, Wyoming, and Colorado. Fishes that occur as disjunct, relict populations in small cool- or clear-water streams or at the periphery of their range in individual states are susceptible to local extirpations caused by habitat alterations and introductions of exotic piscivorous fishes but may have significant conservation value due to their genetic diversity. Given the large proportion of native Great Plains fishes that are declining or threatened with extirpation in individual states, a region-wide effort to maintain native fish assemblages is warranted.

Stock enhancement as a fisheries management tool

2005 ◽  
Vol 13 (4) ◽  
pp. 409-432 ◽  
Author(s):  
Brett W. Molony ◽  
R. Lenanton ◽  
G. Jackson ◽  
J. Norriss
Keyword(s):  
Fisheries Management ◽  
Stock Enhancement ◽  
Management Tool

scholarly journals Applying global best practices for estimating unreported catches in Norwegian fisheries under a discard ban

2020 ◽  
Author(s):  
Thomas L. Clegg ◽  
Steven J. Kennelly ◽  
Geir Blom ◽  
Kjell Nedreaas
Keyword(s):  
Best Practices ◽  
Fisheries Management ◽  
Management Tool ◽  
Commercial Fisheries ◽  
Future Studies ◽  
Fit For Purpose ◽  
Regulatory Measures ◽  
Illegal Activities ◽  
Unreported Catches

AbstractIn addition to their role as a fisheries management tool, discard bans can be effective in improving knowledge of total catches via the requirement to land and report all catches. This shifts the focus to understanding the scale of unreported catches in fisheries, rather than only on discards. However, the presence of a discard ban can cause problems with estimation process, as it involves the observation of illegal activities, and the complex sources of unreported catches require a different approach to estimation. The Norwegian discard ban was introduced in 1987 as part of a wider suite of regulatory measures to improve exploitation patterns in commercial fisheries, but a framework for the regular estimation of unreported catches has yet to be established and operationalised. Here, we aim to identify global best practices for estimating unreported catches under a discard ban and assess their applicability to Norwegian fisheries. We approach this in three steps: (1) defining the scope of an estimation, (2) data collection, and (3) the actual procedure for estimation. We discuss how each step can affect the quality of an estimate with regards to accuracy, precision, practical limitations and whether the estimate is fit for purpose. Finally, we provide a list of recommendations for future studies and identify key knowledge gaps and limitations regarding their application to Norwegian fisheries.

scholarly journals Marine Protected Areas (MPAs) as a Fisheries Management Tool for the Nassau Grouper (Epinephelus striatus) in Belize

2021 ◽  
Author(s):  
Lisa S. Beneditti
Keyword(s):  
Protected Areas ◽  
Fisheries Management ◽  
Marine Protected Areas ◽  
Management Tool ◽  
Protection Measures ◽  
Commercial Fish ◽  
Nassau Grouper ◽  
Aggregation Site ◽  
Epinephelus Striatus ◽  
Mpa Network

The Nassau grouper, Epinephelus striatus, was once an important commercial fish species in the Caribbean, but is now considered commercially extinct throughout its range. Protection measures have included protection of adults via seasonal closures and spawning aggregation site reserves (SASRs). Marine protected areas (MPAs) are a promising fisheries management tool being used increasingly worldwide but are not specifically directed at the conservation of Nassau grouper. This thesis uses Belize as a case study location to determine how the established MPA network may contribute towards its protection. It was found that the Belize MPA network as a system may not contribute greatly, however, on an individual basis some MPAs contribute more to protection than others. Those MPAs which have characteristics most suitable for this species are Gladden Spit and Silk Cayes, Sapodilla Cayes, Bacalar Chico, Glovers Reef, Hol Chan, and South Water Caye Marine Reserves.

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