scholarly journals Telemetry and genetics reveal asymmetric dispersal of a lake‐feeding salmonid between inflow and outflow spawning streams at a microgeographic scale

2020 ◽  
Vol 10 (4) ◽  
pp. 1762-1783
Author(s):  
Ross Finlay ◽  
Russell Poole ◽  
Jamie Coughlan ◽  
Karl P. Phillips ◽  
Paulo Prodöhl ◽  
...  
Keyword(s):  
Asymmetric Dispersal ◽  
Spawning Streams

RECLAMATION AND CULVERT CROSSINGS MADE OF CORRUGATED PIPES ON SPAWNING STREAMS

2020 ◽  
pp. 68-77
Author(s):  
O.N. CHERNYKH ◽  
◽  
A.V. RBURLACHENKO
Keyword(s):  
Single Point ◽  
Experimental Studies ◽  
Fish Passage ◽  
Future Research ◽  
Fish Stocks ◽  
Metal Structures ◽  
Natural Reproduction ◽  
Spiral Shape ◽  
Corrugated Metal ◽  
Spawning Streams

Recommendations are presented for solving issues that arise in the design and operation of tubular transport crossings of corrugated metal structures through spawning streams while ensuring the safety and natural reproduction of fish stocks. There are discussed the results of experimental studies of culverts made of metal corrugated pipes with a normal and spiral shape of corrugation the bottom of which is buried and filled with suitable granular material to the level of the natural channel of a small watercourse. It is established that when 10% of the area of the corrugated pipe is occupied by stone filling, its throughput is reduced by about 10-12%. Based on the review of the existing literature and the results of laboratory experiments, data is provided to estimate the values of the roughness coefficients of the composite cross-section of a single-point junction and directions for future research on culvert reclamation are outlined. Studying of the structure of the velocity distribution in culverts can lead to the improved conditions for fish passage without installing special structural elements in the transit path of the fish passage structure.

Interactive physical and biotic factors control dissolved oxygen in salmon spawning streams in coastal Alaska

2018 ◽  
Vol 81 (1) ◽  
Author(s):  
Jason B. Fellman ◽  
Eran Hood ◽  
Sonia Nagorski ◽  
John Hudson ◽  
Sanjay Pyare
Keyword(s):  
Dissolved Oxygen ◽  
Biotic Factors ◽  
Spawning Streams

Lamprey Parasitism of Rainbow Trout in Southern Georgian Bay

1967 ◽  
Vol 24 (12) ◽  
pp. 2539-2548 ◽  
Author(s):  
A. H. Berst ◽  
A. A. Wainio
Keyword(s):  
Rainbow Trout ◽  
Fork Length ◽  
Georgian Bay ◽  
Low Level ◽  
Spawning Streams

Of 2614 adult rainbow trout sampled from the Nottawasaga River of Georgian Bay during the period of 1961–67 inclusive, approximately 7.1% had one or more lamprey marks. The trout ranged in fork length from 10 to 33 inches (25 to 84 cm). However, lamprey marks were present only on fish over 16 inches (40 cm) in length. Multiple scarring was found on 30% of the trout that were marked. The incidence of marked fish reached a maximum of 17.2% in the spring of 1962, then declined to 1.3% in the fall of the same year. This decline was coincident with a reduction in the lamprey population after experimental lampricide treatment of the Nottawasaga River and adjacent lamprey spawning streams during 1960 and 1961. The incidence of marked fish remained at a relatively low level for a period of 4 years, then increased substantially, after the presumed recruitment of metamorphosed lampreys during 1966 and 1967.

Population abundance of two-patch competitive systems with asymmetric dispersal

2020 ◽  
Vol 81 (1) ◽  
pp. 315-341
Author(s):  
Yuanshi Wang ◽  
Hong Wu ◽  
Yiyang He ◽  
Zhihui Wang ◽  
Kun Hu
Keyword(s):  
Population Abundance ◽  
Competitive Systems ◽  
Asymmetric Dispersal

scholarly journals Asymmetric dispersal is a critical element of concordance between biophysical dispersal models and spatial genetic structure in Great Barrier Reef corals

2019 ◽  
Vol 25 (11) ◽  
pp. 1684-1696 ◽  
Author(s):  
Cynthia Riginos ◽  
Karlo Hock ◽  
Ambrocio M. Matias ◽  
Peter J. Mumby ◽  
Madeleine J. H. Oppen ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Great Barrier Reef ◽  
Spatial Genetic Structure ◽  
Critical Element ◽  
Barrier Reef ◽  
Reef Corals ◽  
Asymmetric Dispersal

scholarly journals Genomic analysis reveals multiple mismatches between biological and management units in yellowfin tuna (Thunnus albacares)

2018 ◽  
Vol 75 (6) ◽  
pp. 2145-2152 ◽  
Author(s):  
Rachel B Mullins ◽  
Niall J McKeown ◽  
Warwick H H Sauer ◽  
Paul W Shaw
Keyword(s):  
Indian Ocean ◽  
Genomic Analysis ◽  
Yellowfin Tuna ◽  
Thunnus Albacares ◽  
Management Units ◽  
Spawning Site ◽  
Asymmetric Dispersal ◽  
Outlier Loci ◽  
The Indian Ocean ◽  
Mixed Stock

Abstract The South African (SAF) yellowfin tuna (Thunnus albacares) fishery represents a potential example of misalignment between management units and biological processes. The SAF fishery spans an operational stock with a boundary at 20°E, either side of which fish are considered part of Atlantic or Indian Ocean regional stocks. However, the actual recruitment of fish from Atlantic and Indian Ocean spawning populations into SAF waters is unknown. To address this knowledge gap, genomic analysis (11 101 SNPs) was performed on samples from Atlantic and Indian Ocean spawning sites, including SAF sites spanning the current stock boundary. Outlier loci conferred high discriminatory power to assignment tests and revealed that all SAF fish were assigned to the Indian Ocean population and that no Atlantic Ocean fish appeared in the SAF samples. Additionally, several Indian Ocean migrants were detected at the Atlantic spawning site demonstrating asymmetric dispersal and the occurrence of a mixed-stock fishery in Atlantic waters. This study highlights both the spatial inaccuracy of current stock designations and a misunderstanding of interactions between the underlying biological units, which must be addressed in light of local and global declines of the species. Specifically, the entire SAF fishery must be managed as part of the Indian Ocean stock.

Resident Fishes Display Elevated Organic Pollutants in Salmon Spawning Streams of the Great Lakes

2012 ◽  
Vol 46 (15) ◽  
pp. 8035-8043 ◽  
Author(s):  
David J. Janetski ◽  
Dominic T. Chaloner ◽  
Ashley H. Moerke ◽  
Richard R. Rediske ◽  
James P. O’Keefe ◽  
...  
Keyword(s):  
Great Lakes ◽  
Organic Pollutants ◽  
Spawning Streams
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