Horizontal and vertical migration behavior of silver-phase Japanese eels in coastal, pelagic and spawning areas observed by pop-up satellite archival tags

2021 ◽  
Vol 542-543 ◽  
pp. 151587
Author(s):  
Takatoshi Higuchi ◽  
Shun Watanabe ◽  
Ryotaro Manabe ◽  
Akira Tanimoto ◽  
Michael J. Miller ◽  
...  
Keyword(s):  
Vertical Migration ◽  
Migration Behavior ◽  
Archival Tags ◽  
Spawning Areas

Challenges for Diadromous Fishes in a Dynamic Global Environment

2009 ◽  
Keyword(s):  
New Technology ◽  
Data Retrieval ◽  
Ecosystem Approach ◽  
Migration Behavior ◽  
Fully Integrated ◽  
Return Rates ◽  
Archival Tags ◽  
Acoustic Tags ◽  
Electronic Tags ◽  
Diadromous Species

<em>Abstract</em>.-Tagging fish with electronic tags can provide information on movement, migration, behavior, and stock structure while diadromous species are at sea. The state of the art technology for tracking fishes in the marine environment includes two families of tags. Archival tags store data and either relay them to satellites or require recapture for interrogation. Low return rates for diadromous species make these tags very expensive to use. A second type, acoustic tags, sends signals to passive receivers. Information is collected from the fish only when it is within range of a receiver. Technology is now being developed to mesh these tags into a fully integrated tag that will permit archived data to be transmitted acoustically over multiple frequencies to receivers allowing data retrieval without recapturing the animal. The new technology includes a "business card" tag that is a miniaturized receiver coupled with a coded pulse transmitter. These tags will exchange and record individual-specific codes when two animals carrying them come within acoustic range of each other, which will allow data from many animals to be moved ashore through few animals. These devices would be ideal for quantifying the degree of school fidelity (or, conversely, mixing) or the degree of at sea interaction of fishes from different river systems and provide ecological information to enhance management in an ecosystem approach to fisheries.

Seasonal changes in the diel vertical migration of Chaoborus punctipennis larval instars

2014 ◽  
Vol 71 (5) ◽  
pp. 665-674 ◽  
Author(s):  
Lauren Emily Barth ◽  
W. Gary Sprules ◽  
Mathew Wells ◽  
Melissa Coman
Keyword(s):  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Acoustic Doppler Current Profiler ◽  
Acoustic Backscatter ◽  
Migration Behavior ◽  
Larval Instars ◽  
Reverse Migration ◽  
Coregonus Artedi ◽  
Chaoborus Punctipennis ◽  
Current Profiler

We describe a novel seasonal shift in the vertical migration behavior of Chaoborus punctipennis second-instar larvae in Lake Opeongo, Ontario. An upward-looking 600 kHz acoustic Doppler current profiler (ADCP) moored at a fixed 22 m station in the lake recorded acoustic backscatter continuously during the study period. Zooplankton samples collected indicated that the abundance of C. punctipennis larval instars accounted for the greatest proportion of variance in the linear backscatter from the ADCP. The large fourth-instar larvae underwent normal diel vertical migration throughout the study. Smaller second-instar larvae underwent reverse migration during late June but switched to normal migration by late July. The acoustic record indicates that the switch occurred over a few days around late June, and at this time a double vertical migration appeared with the second instars leading and following the migration of fourth instars. We speculate that these changes in the migration of second instars are driven by seasonal shifts in predation risk from larval cisco (Coregonus artedi) and by the need to minimize spatial overlap with the larger fourth instars.

scholarly journals Diel vertical migration behavior of Calanus finmarchicus and its influence on right and sei whale occurrence

2011 ◽  
Vol 423 ◽  
pp. 167-184 ◽  
Author(s):  
MF Baumgartner ◽  
NSJ Lysiak ◽  
C Schuman ◽  
J Urban-Rich ◽  
FW Wenzel
Keyword(s):  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Calanus Finmarchicus ◽  
Migration Behavior

Mysis relicta Assimilation of Hexachlorobiphenyl from Sediments

1991 ◽  
Vol 48 (2) ◽  
pp. 284-289 ◽  
Author(s):  
J. Val Klump ◽  
Jerry L. Kaster ◽  
Michael E. Sierszen
Keyword(s):  
Particle Size ◽  
Vertical Migration ◽  
Specific Activity ◽  
Migration Behavior ◽  
Fecal Material ◽  
Selective Feeding ◽  
Deep Lakes ◽  
Mysis Relicta ◽  
Pelagic Environment ◽  
Important Pathway

Assimilation and retention of a PCB congener, 2,4,5,2′,4′,5′-hexachlorobiphenyl (HCBP), by the oppossum shrimp, Mysis relicta, was followed during sediment ingestion and defecation using a 14C label. Uptake was rapid and essentially linear, with mysids reaching a [14C]HCBP specific activity equivalent to that in the labeled sediment within 2 wk. Assimilation efficiencies calculated from the relative depletion of the label in the fecal material averaged 53% (±7%). Sediment ingestion rates calculated from the activity required to supply the label retained were approximately 1 mg∙mysid−1∙d−1, in agreement with published estimates. The distribution of HCBP as a function of particle size indicates that particle-size selective feeding by detritivores can have a significant effect on calculated assimilation efficiencies. Given the vertical migration behavior of M. relicta, sediment ingestion is a potentially important pathway for the reintroduction of sediment-associated contaminants into the pelagic environment of deep lakes.

Complex migration routes of Atlantic bluefin tuna (Thunnus thynnus) question current population structure paradigm

2010 ◽  
Vol 67 (6) ◽  
pp. 966-976 ◽  
Author(s):  
Benjamin Galuardi ◽  
François Royer ◽  
Walt Golet ◽  
John Logan ◽  
John Neilson ◽  
...  
Keyword(s):  
Site Fidelity ◽  
Bluefin Tuna ◽  
Thunnus Thynnus ◽  
Migration Routes ◽  
Western Atlantic ◽  
Spawning Period ◽  
Atlantic Bluefin Tuna ◽  
Spawning Site ◽  
Archival Tags ◽  
Spawning Areas

Movements of Atlantic bluefin tuna ( Thunnus thynnus , ABFT) from specific western Atlantic forage grounds are not well described, and the extent of their spawning areas is mainly surmised. In 2005 and 2006, we deployed 41 pop-up satellite archival tags (PSATs) on adult Atlantic bluefin tuna off the coast of Nova Scotia, Canada, and on Georges Bank. During the assumed spawning period, 56% of the tagged ABFT occupied a known spawning area, while 44% were located in distant oceanic regions. Assuming obligate annual spawning, these results are inconsistent with the notion of spawning site fidelity to the Gulf of Mexico. The ocean-wide migrations of adult ABFT tagged on a common forage ground suggest evidence of a metapopulation requiring more spatially explicit management than the current simple two-stock structure.

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