Canadian Journal of Fisheries and Aquatic Sciences

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Influence of Nutrient Enrichment and Light Availability on the Abundance of Aquatic Macrophytes in Florida Streams
Canadian Journal of Fisheries and Aquatic Sciences - Tập 45 Số 8 - Trang 1467-1472 - 1988
Daniel E. Canfield, Mark V. Hoyer
A survey of 17 Florida streams was conducted between October 1984 and August 1986 to determine if the abundance of aquatic macrophytes was related to nutrient enrichment. Macrophyte standing crops were not correlated with in-stream total phosphorus or total nitrogen concentrations. Aquatic macrophytes contained less than 2% of the annual nutrient discharge in nearly all streams. Nutrients are, the... hiện toàn bộ
Microplastic pollution in St. Lawrence River sediments
Canadian Journal of Fisheries and Aquatic Sciences - Tập 71 Số 12 - Trang 1767-1771 - 2014
Rowshyra A. Castañeda, Sunčica Avlijaš, M. Anouk Simard, Anthony Ricciardi
Although widely detected in marine ecosystems, microplastic pollution has only recently been documented in freshwater environments, almost exclusively in surface waters. Here, we report microplastics (polyethylene microbeads, 0.40–2.16 mm diameter) in the sediments of the St. Lawrence River. We sampled 10 freshwater sites along a 320 km section from Lake St. Francis to Québec City by passing sedim... hiện toàn bộ
Copepod production drives recruitment in a marine fish
Canadian Journal of Fisheries and Aquatic Sciences - Tập 65 Số 8 - Trang 1528-1531 - 2008
Martín Castonguay, Stéphane Plourde, Dominique Robert, Jeffrey A. Runge, Louis Fortier
Predicting fluctuations in recruitment of commercial marine fish remains the Holy Grail of fisheries science. In previous studies, we identified statistical relationships linking Atlantic mackerel ( Scomber scombrus ) recruitment to regional climate, zooplankton biomass, and the production of copepod nauplii over a decade (1982–1991) that included the exceptionally strong year class of 1982. Here ... hiện toàn bộ
Biophysical models reveal the role of tides, wind, and larval behaviour in early transport and retention of Atlantic herring (Clupea harengus) in the Celtic Sea
Canadian Journal of Fisheries and Aquatic Sciences - Tập 77 Số 1 - Trang 90-107 - 2020
Inge Deschepper, Kieran Lyons, Olga Lyashevska, Deirdre Brophy
Fish are adapted to spawn where their larvae will be retained in, or transported to, suitable juvenile habitat. Variability in circulation and behaviour produces variation in larval transport with consequences for recruitment. A biophysical model was used to simulate early larval dispersal of Celtic Sea herring (Clupea harengus) during wintertime in 6 years (2002, 2003, 2004, 2005, 2008, 2010). Af... hiện toàn bộ
Modelling the dispersal and mortality of Browns Bank egg and larval haddock (Melanogrammus aeglefinus)
Canadian Journal of Fisheries and Aquatic Sciences - Tập 57 Số 12 - Trang 2519-2535 - 2000
David Brickman, Kenneth T. Frank
An early life stage model is described with constant mortality for egg and larval stages. The model is used to simulate the stage 4 egg and larval data for haddock (Melanogrammus aeglefinus) in southwest Nova Scotia for the years 1983-1985. The model is initialized using published abundance and mortality estimates for these years, and its output is compared with field data. We find that the model ... hiện toàn bộ
Evolutionary individual-based model for the recruitment of anchovy (Engraulis capensis) in the southern Benguela
Canadian Journal of Fisheries and Aquatic Sciences - Tập 59 Số 5 - Trang 910-922 - 2002
Christian Mullon, Philippe Cury, Pierrick Penven
Evolutionary simulations are developed to explore environmental constraints that select observed spatial and temporal spawning patterns for anchovy (Engraulis capensis) in the southern Benguela. They couple a realistic three-dimensional hydrodynamic model with an individual-based model in which an evolutionary-based reproductive strategy for adult fish and a passive transport for early life stages... hiện toàn bộ
Using an individual-based model of fish assemblages to study the response of size spectra to changes in fishing
Canadian Journal of Fisheries and Aquatic Sciences - Tập 61 Số 3 - Trang 414-431 - 2004
Yunne‐Jai Shin, Philippe Cury
For most fish species, strong environmental constraints imposed by living in an aquatic medium have produced converging streamlined body forms without prehensile appendices. This similarity in body shapes highlights a common predation constraint: a predatory fish must have a jaw large enough to swallow its prey. Fish diets may then reflect local prey availability and predator–prey size ratios. Bas... hiện toàn bộ
Impact of mussel (Mytilus galloprovincialis) raft-culture on benthic macrofauna, in situ oxygen uptake, and nutrient fluxes in Saldanha Bay, South Africa
Canadian Journal of Fisheries and Aquatic Sciences - Tập 58 Số 5 - Trang 1021-1031 - 2001
Jeanie Stenton-Dozey, T. A. Probyn, Alistair Busby
Culture of the mussel Mytilus galloprovincialis in a South African bay created organic enrichment and anoxia in sediments. Particulate organic matter (POM) was high under rafts versus the references, especially in the first 10 cm (C = 7.5 versus 0.4%, N = 0.7 versus 0.08%). Total reducible sulphides (TRS) increased threefold downcore (from 0.04 to 0.12%). High C:N ratios (12–15) indicated accumula... hiện toàn bộ
Osmoregulatory plasticity of the glass eel ofAnguilla anguilla: freshwater entry and changes in branchial ion-transport protein expression
Canadian Journal of Fisheries and Aquatic Sciences - Tập 61 Số 3 - Trang 432-442 - 2004
Jonathan M. Wilson, Carlos Antunes, Patrício Bouça, J. Coimbra
The glass-eel stage of the life history of Anguillid eels (Anguilla spp.) makes the important physiological transition from seawater (SW) to freshwater (FW) osmoregulation. Central to successful adaptation to fresh water is the switch from active hypoosmoregulation (ion excretion) to active hyperosmoregulation (ion uptake) to counter passive fluxes imposed by concentration gradients. Anguilla angu... hiện toàn bộ
Plasma Cortisol Levels of Fingerling Rainbow Trout (Salmo gairdneri) at Rest, and Subjected to Handling, Confinement, Transport, and Stocking
Canadian Journal of Fisheries and Aquatic Sciences - Tập 37 Số 5 - Trang 805-811 - 1980
Bruce Barton, Richard Peter, C. R. Paulencu
Fingerling rainbow trout, acclimated to hatchery raceways or laboratory aquaria, had low plasma cortisol levels (≤ 2 ng/mL), with no apparent daily cycle in levels. Netting of cohorts out of an aquarium, without agitation, did not cause a rise in plasma cortisol concentrations in remaining fish. However, following 90 s of handling and confinement by netting, fingerlings had a sharp rise in plasma ... hiện toàn bộ
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