scholarly journals Modelling Antarctic krill circumpolar spawning habitat quality to identify regions with potential to support high larval production

2021 ◽  
Author(s):  
David B. Green ◽  
Sophie Bestley ◽  
Stuart P. Corney ◽  
Rowan Trebilco ◽  
Patrick Lehodey ◽  
...  
Keyword(s):  
Habitat Quality ◽  
Antarctic Krill ◽  
Spawning Habitat ◽  
Larval Production

Does the value of newly accessible spawning habitat for walleye (Stizostedion vitreum) depend on its location relative to nursery habitats?

2003 ◽  
Vol 60 (12) ◽  
pp. 1527-1538 ◽  
Author(s):  
Michael L Jones ◽  
John K Netto ◽  
Jason D Stockwell ◽  
Joseph B Mion
Keyword(s):  
Habitat Restoration ◽  
Stizostedion Vitreum ◽  
Spawning Habitat ◽  
Nursery Areas ◽  
Western Lake ◽  
Spawning Areas ◽  
Nursery Habitats ◽  
Larval Production ◽  
Sandusky River ◽  
Western Lake Erie

The benefit accrued from habitat restoration actions may depend not only on the quality and quantity of habitat restored, but also on its location relative to other critical habitats. For example, walleye (Stizostedion vitreum) larvae need to be transported by river currents from spawning to nursery habitats soon after emergence. We developed a model of river transport survival for larval walleye to evaluate potential recruitment from riverine spawning habitats to lacustrine nursery areas. Published relationships were used to model transport survival as a function of temperature and velocity. At greater distances from nursery areas, mortality risk increases, particularly as a result of starvation at relatively high river temperatures. We applied the model to the Sandusky River, a tributary to western Lake Erie, and found potential larval production from spawning habitat above an existing dam to exceed the potential of presently accessible spawning areas by a factor of 8. We used a generalized version of the model to show that for transport distances of less than 100 km, transport survival is much more sensitive to variations in river flows, whereas at greater distances, temperature becomes increasingly important.

Effects of hypoxia on habitat quality of pelagic planktivorous fishes in the northern Gulf of Mexico

2014 ◽  
Vol 505 ◽  
pp. 209-226 ◽  
Author(s):  
H Zhang ◽  
DM Mason ◽  
CA Stow ◽  
AT Adamack ◽  
SB Brandt ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Habitat Quality ◽  
Northern Gulf Of Mexico

Spatial ecology and growth in early life stages of bay anchovy Anchoa mitchilli in Chesapeake Bay (USA)

2020 ◽  
Vol 651 ◽  
pp. 125-143
Author(s):  
TD Auth ◽  
T Arula ◽  
ED Houde ◽  
RJ Woodland
Keyword(s):  
Chesapeake Bay ◽  
Spatial Ecology ◽  
Environmental Variability ◽  
Larval Growth ◽  
Larval Abundance ◽  
Spatial And Temporal Variability ◽  
Estuarine Ecosystem ◽  
Anchoa Mitchilli ◽  
Larval Production ◽  
Bay Anchovy

The bay anchovy Anchoa mitchilli is the most abundant fish in Chesapeake Bay (USA) and is a vital link between plankton and piscivores within the trophic structure of this large estuarine ecosystem. Baywide distributions and abundances of bay anchovy eggs and larvae, and larval growth, were analyzed in a 5 yr program to evaluate temporal and spatial variability based on research surveys in the 1995-1999 spawning seasons. Effects of environmental variability and abundance of zooplankton that serve as prey for larval bay anchovy were analyzed. In the years of these surveys, 97.6% of eggs and 98.8% of larvae occurred in the polyhaline lower bay. Median egg and larval abundances differed more than 10-fold for surveys conducted in the 5 yr and were highest in the lower bay. Within years, median larval abundance (ind. m-2) in the lower bay was generally 1-2 orders of magnitude higher than upper-bay abundance. Salinity, temperature, and dissolved oxygen explained 12% of the spatial and temporal variability in egg abundances and accounted for 27% of the variability in larval abundances. The mean, baywide growth rate for larvae over the 5 yr period was 0.75 ± 0.01 mm d-1, and was best explained by zooplankton concentration and feeding incidence. Among years, mean growth rates ranged from 0.68 (in 1999) to 0.81 (in 1998) mm d-1 and were fastest in the upper bay. We identified environmental factors, especially salinity, that contributed to broadscale variability in egg and larval production.

Observation on behaviours of Antarctic krill (Euphausia superba) in lighting condition

2012 ◽  
Vol 36 (2) ◽  
pp. 300
Author(s):  
Peng-xiang XU ◽  
Ying-chun LI ◽  
Guo-ping ZHU ◽  
Hui XIA ◽  
Liu-xiong XU
Keyword(s):  
Antarctic Krill ◽  
Euphausia Superba ◽  
Lighting Condition ◽  
Antarctic Krill Euphausia Superba
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