The Role of Microscale Turbulence in the Feeding Ecology of Larval Fish

1997 ◽  
pp. 169-220 ◽  
Author(s):  
John F. Dower ◽  
Thomas J. Miller ◽  
William C. Leggett
Keyword(s):  
Feeding Ecology ◽  
Larval Fish

Characterizing spatial structures of larval fish assemblages at multiple scales in relation to environmental heterogeneity in the Strait of Georgia (British Columbia, Canada)

2018 ◽  
Vol 75 (11) ◽  
pp. 1902-1914 ◽  
Author(s):  
Lu Guan ◽  
John F. Dower ◽  
Pierre Pepin
Keyword(s):  
British Columbia ◽  
Environmental Heterogeneity ◽  
Multiple Scales ◽  
Larval Fish ◽  
Critical Role ◽  
Multiscale Approach ◽  
Spatial Structures ◽  
Strait Of Georgia ◽  
Medium Scale

Spatial structures of larval fish in the Strait of Georgia (British Columbia, Canada) were quantified in the springs of 2009 and 2010 to investigate linkages to environmental heterogeneity at multiple scales. By applying a multiscale approach, principal coordinate neighborhood matrices, spatial variability was decomposed into three predefined scale categories: broad scale (>40 km), medium scale (20∼40 km), and fine scale (<20 km). Spatial variations in larval density of the three dominant fish taxa with different early life histories (Pacific herring (Clupea pallasii), Pacific hake (Merluccius productus), and northern smoothtongue (Leuroglossus schmidti)) were mainly structured at broad and medium scales, with scale-dependent associations with environmental descriptors varying interannually and among species. Larval distributions in the central-southern Strait were mainly associated with salinity, temperature, and vertical stability of the top 50 m of the water column on the medium scale. Our results emphasize the critical role of local estuarine circulation, especially at medium spatial scale, in structuring hierarchical spatial distributions of fish larvae in the Strait of Georgia and suggest the role of fundamental differences in life-history traits in influencing the formation and maintenance of larval spatial structures.

Population dynamics and feeding ecology of juvenile Australian salmon (Arripis trutta) in Westren Port, Victoria

1982 ◽  
Vol 33 (2) ◽  
pp. 369 ◽  
Author(s):  
AI Robertson
Keyword(s):  
Population Dynamics ◽  
Water Column ◽  
Feeding Ecology ◽  
Age Group ◽  
Gill Raker

Juveniles (0 + age group) of both subspecies of the Australian salmon were captured over eelgrass meadows in Western Port at various times between October 1974 and February 1976. The western subspecies and the eastern subspecies were present from August through April, and December through May, respectively. The western subspecies always fed on benthic-dwelling prey including fishes, crabs and shrimps, and the eastern subspecies fed on prey which inhabited the water column (crustacean larvae, insects and epitokous polychaetes) in December but switched to benthic-dwelling prey (fishes, small squid, benthic crustaceans and polychaetes) in May. The role of different gill-raker number and morphology in effecting dietary separation of the subspecies is unclear.

The role of the generally unrecognised microprey source as food for larval fish in the Irish Sea

2005 ◽  
Vol 148 (2) ◽  
pp. 395-404 ◽  
Author(s):  
Gisela M. de Figueiredo ◽  
Richard D. M. Nash ◽  
David J. S. Montagnes
Keyword(s):  
Larval Fish ◽  
Irish Sea ◽  
The Irish Sea

Feeding ecology of the non-indigenous fish Hypomesus nipponensis in Lake Ulungur, China: insight into the relationship between its introduction and the collapse of the native Eurasian perch population

2013 ◽  
Vol 64 (6) ◽  
pp. 549
Author(s):  
Xiaoyu Zhou ◽  
Zhongjun Hu ◽  
Qigen Liu ◽  
Lili Yang ◽  
Yubo Wang
Keyword(s):  
Feeding Ecology ◽  
Important Food ◽  
Eurasian Perch ◽  
Chironomid Larvae ◽  
Feeding Spectrum ◽  
Index Of Relative Importance ◽  
The Relationship ◽  
Japanese Smelt ◽  
Insight Into

Studies of feeding ecology are essential in gaining an understanding of how established non-indigenous fish species interact with the invaded communities. In the present study, we investigated the composition and seasonal variation in the diet of the introduced Japanese smelt Hypomesus nipponensis, a small planktivorous fish, in Lake Ulungur, China. The objective was to examine the ecological role of this established non-indigenous smelt through the analysis of its diet, which might give more insight into the relationship between its introduction and the collapse of the native Eurasian perch population. Results showed that the Japanese smelt had a broader feeding spectrum than had been previously reported. Of 10 taxonomic or ecological categories of food, cladocerans (54.70%) and rotifers (15.39%) were the most important food items in terms of the index of relative importance (IRI), whereas surface food and chironomid larvae were the most important by weight. Although cladocerans were consistently the most important food, rotifers and copepods, together with surface food and chironomid larvae, substituted when cladocerans were scarcer. Because both rotifers and chironomid larvae are important food of larval and young perch, introduction of Japanese smelt into the lake might be responsible for the collapse of the perch population because of the suppression of rotifers and chironomid larvae in spring through seasonal predation.

The role of wind-forcing in the distribution of larval fish in Galway Bay, Ireland

2012 ◽  
Vol 93 (2) ◽  
pp. 471-478 ◽  
Author(s):  
Stephen Comerford ◽  
Deirdre Brophy
Keyword(s):  
Environmental Factors ◽  
Generalized Linear Model ◽  
Larval Fish ◽  
Juvenile Fish ◽  
Residual Circulation ◽  
Tidal State ◽  
Merlangius Merlangus ◽  
Sampling Season ◽  
Distribution Of Fish

The ichthyoplankton of Galway Bay was sampled over the spring and summer of 2007 and 2008 to determine what environmental factors influenced the distribution of larval and early juvenile fish. A total of 549 fish representing 27 taxa were caught. Catches decreased throughout each sampling season, and were generally poor in 2007. Catches were numerically dominated by sprat (Sprattus sprattus), dab (Limanda limanda), sand eel (Hyperoplus immaculatus) and whiting (Merlangius merlangus). Environmental factors driving distribution of fish were modelled using a binomial generalized linear model. The strength and direction of wind in the five days preceding sampling was the only significant environmental factor. Sustained onshore winds increased the probability of encountering larval fish in the areas sampled. The rainfall, tidal state, tow depth and wind conditions during sampling were not significant. Among the parameters measured it appears that onshore winds sufficiently strong to overcome the residual circulation are the main physical driver for the distribution of larval fish in Galway Bay.

The role of internal waves in larval fish interactions with potential predators and prey

2014 ◽  
Vol 127 ◽  
pp. 47-61 ◽  
Author(s):  
Adam T. Greer ◽  
Robert K. Cowen ◽  
Cedric M. Guigand ◽  
Jonathan A. Hare ◽  
Dorothy Tang
Keyword(s):  
Internal Waves ◽  
Larval Fish ◽  
Fish Interactions

scholarly journals Teneurin C-Terminal Associated Peptide (TCAP)-3 Increases Metabolic Activity in Zebrafish

2021 ◽  
Vol 7 ◽  
Author(s):  
Ross M. Reid ◽  
Andrea L. Reid ◽  
David A. Lovejoy ◽  
Peggy R. Biga
Keyword(s):  
Metabolic Activity ◽  
Larval Fish ◽  
Metabolic Effects ◽  
Stress Axis ◽  
Adult Zebrafish ◽  
Mitochondrial Uncoupling ◽  
Activity Increase ◽  
Metabolism Regulation ◽  
High Conservation

Teneurin C-terminal associated peptides (TCAP), bioactive peptides located on the C-terminal end of teneurin proteins, have been shown to regulate stress axis functions due to the high conservation between TCAP and corticotropin releasing factor (CRF). Additionally, recent work demonstrated that TCAP can increase metabolism in rats via glucose metabolism. These metabolic actions are not well described in other organisms, including teleosts. Here we investigated the expression of a tcap isoform, tcap-3, and the potential role of TCAP-3 as a regulator of metabolism across zebrafish life-stages. Using pcr-based analyses, tcap-3 appears to be independently transcribed, in relation to teneurin-3, in muscle tissue of adult zebrafish. Resazurin, respirometry chambers, and mitochondrial metabolism analyses were used to study the metabolic effects of synthetic rainbow trout TCAP-3 (rtTCAP-3) in larval and adult zebrafish. Overall, metabolic activity was enhanced by 48 h of rtTCAP-3 treatment in larvae (bath immersion) and adults (intraperitoneal injections). This metabolic activity increase was due to mitochondrial uncoupling, as mitochondrial respiration increase by rtTCAP-3 was due to proton leak. Additionally, rtTCAP-3 protected larval fish from reduced metabolic activity induced by low temperatures. Subsequently, rtTCAP-3 increased metabolic output in adult zebrafish subjected to accelerated swimming speeds, demonstrating the potent role of rtTCAP-3 in zebrafish metabolism regulation during metabolic challenges. Collectively, these results demonstrate the conserved roles for rtTCAP-3 as a metabolic activator in zebrafish.

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