scholarly journals Behavior-dependent selectivity of yellowtail flounder (Limanda ferruginea) in the mouth of a commercial bottom trawl

2015 ◽  
Vol 113 (4) ◽  
pp. 430-441 ◽  
Author(s):  
Melanie J. Underwood ◽  
Paul D. Winger ◽  
Anders Fernö ◽  
Arill Engås
Keyword(s):  
Bottom Trawl ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea

scholarly journals Age determination, validation and growth of Grand Bank yellowtail flounder (Limanda ferruginea)

2003 ◽  
Vol 60 (5) ◽  
pp. 1123-1138 ◽  
Author(s):  
Karen S Dwyer ◽  
Stephen J Walsh ◽  
Steven E Campana
Keyword(s):  
Age Determination ◽  
Thin Sections ◽  
Grand Banks ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea ◽  
Conventional View ◽  
Bomb Radiocarbon ◽  
Marginal Increment ◽  
Length Frequency Analysis

Abstract Yellowtail flounder (Limanda ferruginea) (Storer, 1839) on the Grand Bank off Newfoundland were traditionally aged using surface-read whole otoliths. Age determination of otoliths from recaptures of fish tagged in the early 1990s indicated that the traditional ageing technique was underestimating the ages of yellowtail flounder when compared with the time at liberty. Age comparisons between whole and thin-sectioned otoliths showed agreement in age readings up to 7 years; thereafter whole otoliths tended to give much lower ages than those estimated by thin sections. Length–frequency analysis of pelagic and demersal juveniles, captive rearing of juveniles and marginal increment analysis all corroborated age determination based on thin sections. Tag-recaptures and bomb radiocarbon assays validated age interpretations based on thin sections in young and old yellowtail flounder, respectively. Ages were validated up to 25 years for females and 21 years for males. However, because of increased narrowing of annuli in thin-sectioned otoliths from old fish, even thin sections may underestimate the true age of the fish. von Bertalanffy growth curve parameters (combined sexes) were L∞ = 55.6 cm total length, K=0.16 and t0=−0.003. These results challenge the conventional view that yellowtail flounder on the Grand Banks are a relatively fast growing, short-lived species.

Digenean parasite communities in flatfishes of the Scotian Shelf and southern Gulf of St. Lawrence

1982 ◽  
Vol 60 (11) ◽  
pp. 2804-2811 ◽  
Author(s):  
J. S. Scott
Keyword(s):  
Feeding Behavior ◽  
Feeding Habits ◽  
Stomach Contents ◽  
Parasite Prevalence ◽  
Winter Flounder ◽  
Fish Length ◽  
Pseudopleuronectes Americanus ◽  
Scotian Shelf ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea

Prevalence of digenean parasites in four major flatfishes of the Scotian Shelf and southern Gulf of St. Lawrence, American plaice (Hippoglossoides platessoides), yellowtail flounder (Limanda ferruginea), witch flounder (Glyptocephalus cynoglossus), and winter flounder (Pseudopleuronectes americanus), is compared between hosts in relation to geographic distribution, season, feeding behavior, and fish length. The 13 parasite species indicate overlap of feeding habits among hosts but also considerable diversity in feeding behavior, supporting the evidence from examination of stomach contents. Prevalence of digeneans in different final hosts varied between geographic areas and may be used to characterize the populations of the comparatively sedentary flatfish populations. Seasonal variation in prevalence was consistent from area to area but differed between parasites, from the expected increase in summer in some, concomitant with increased feeding, to a winter increase in others, probably related to a seasonal change of diet. Fish length had little effect on parasite prevalence in yellowtail flounder and witch flounder but had a notable effect on plaice and winter flounder from the Gulf of St. Lawrence, again apparently related to change of diet.

scholarly journals Demonstration of a spatially explicit, tag-integrated stock assessment model with application to three interconnected stocks of yellowtail flounder off of New England

2014 ◽  
Vol 72 (1) ◽  
pp. 164-177 ◽  
Author(s):  
Daniel R. Goethel ◽  
Christopher M. Legault ◽  
Steven X. Cadrin
Keyword(s):  
New England ◽  
Integrated Assessment ◽  
Stock Assessment ◽  
Assessment Model ◽  
Spatially Explicit ◽  
Closed Population ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea ◽  
Stock Assessments ◽  
Source Sink

Abstract Ignoring population structure and connectivity in stock assessment models can introduce bias into important management metrics. Tag-integrated assessment models can account for spatially explicit population dynamics by modelling multiple population components, each with unique demographics, and estimating movement among them. A tagging submodel is included to calculate predicted tag recaptures, and observed tagging data are incorporated in the objective function to inform estimates of movement and mortality. We describe the tag-integrated assessment framework and demonstrate its use through an application to three stocks of yellowtail flounder (Limanda ferruginea) off New England. Movement among the three yellowtail flounder stocks has been proposed as a potential source of uncertainty in the closed population assessments of each. A tagging study was conducted during 2003–2006 with over 45 000 tagged fish released in the region, and the tagging data were included in the tag-integrated model. Results indicated that movement among stocks was low, estimates of stock size and fishing mortality were similar to those from conventional stock assessments, and incorporating stock connectivity did not resolve residual patterns. Despite low movement estimates, new interpretations of regional stock dynamics may have important implications for regional fisheries management given the source-sink nature of movement estimates.

Distribution of ichthyophonus hoferi (Mastigomycotina: ichthyophonales) in yellowtail flounder, Limanda ferruginea, from the Nova Scotia Shelf, Canada

1992 ◽  
Vol 72 (3) ◽  
pp. 669-674 ◽  
Author(s):  
Thomas G. Rand
Keyword(s):  
Nova Scotia ◽  
Seasonal Cycle ◽  
Distribution Patterns ◽  
Early Summer ◽  
Seasonal Distribution ◽  
Marine Fishes ◽  
Infection Prevalence ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea ◽  
Early Fall

A survey was conducted from 1986 to 1987 to determine the spatial and seasonal distribution patterns of Ichthyophonus hoferi Plehn & Mulsow, 1911 in marine fishes, especially yellowtail flounder, Limanda ferruginea, from the Nova Scotia shelf, Canada. Ichthyophonus hoferi was found in 56 of 6759 (0·83%) yellowtail flounder, in one of 613 (0·16%) haddock, Melanogrammus aelgefinus, but in none of the other 1485 fishes representing seven species sampled from this area. Within the yellowtail flounder population, the fungus was distributed in patchy manner with infection prevalence ranging from 0·4% at Banquereau Bank to about 13% at Brown's Bank. Infection prevalence was the same in both the male and female flounder. There was no apparent seasonal cycle in infection, although pathogen recruitment into L. ferruginea was from early summer through to early fall months.

Larval Flatfish Distributions and Drift on the Southern Grand Bank

1992 ◽  
Vol 49 (3) ◽  
pp. 467-483 ◽  
Author(s):  
Kenneth T. Frank ◽  
John W. Loder ◽  
James E. Carscadden ◽  
William C Leggett ◽  
Christopher T. Taggart
Keyword(s):  
Growth Rate ◽  
Thermocline Depth ◽  
Length Frequency ◽  
Frequency Distributions ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea ◽  
Larval Drift ◽  
Vertical Distributions ◽  
Hippoglossoides Platessoides ◽  
Rule Out

Ichthyoplankton and hydrographic surveys of the southern Grand Bank in September of 1986, 1987, and 1988 revealed substantial correspondence between the areal distributions of larvae of three flatfish species and temperature below the thermocline. Depth-averaged densities of American plaice (Hippoglossoides platessoides) were negatively correlated with temperature whereas yellowtail flounder (Limanda ferruginea) and witch flounder (Glyptocephalus cynoghssus) densities were positively correlated with temperature. In spite of large interannual differences in abundance, the larval distributions showed similar structure from year to year. Using estimates of larval age inferred from length frequency distributions and literature values for growth rate, in conjunction with moored current measurements, estimates of spawning times and locations were obtained for each species. These estimates were compared with historical information on the distribution of prespawning fish for each species to examine the hypothesis of passive larval drift. The results indicate that in most, but not all cases, the larval distributions and currents are consistent with passive larval drift for particular growth rates and vertical distributions. However, the observations are not adequate to rule out alternative mechanisms involving behaviour.

Distribution, Abundance, and Spawning of Yellowtail Flounder, Limanda ferruginea, in the Newfoundland Area of the Northwest Atlantic

1970 ◽  
Vol 27 (12) ◽  
pp. 2261-2271 ◽  
Author(s):  
T. K. Pitt
Keyword(s):  
Drastic Reduction ◽  
Upward Trend ◽  
Northwest Atlantic ◽  
Spawning Period ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea ◽  
Far North ◽  
Sexually Mature

Yellowtail flounder were found as far north as the Strait of Belle Isle; however, the main concentrations were located on Grand and St. Pierre banks. The highest concentrations were found at 31–35 fath (57–64 m) and temperatures of 3.1–4.8 C. Abundance on the Grand Bank apparently increased from 1961 to 1968 coincident with a general upward trend in bottom temperatures and a drastic reduction in the haddock population. The peak spawning period was the latter half of June. Fifty percent of the males were sexually mature at age 5 and 31 cm, and 50% of females at age 6 and 37 cm.

Stock Structure of Scotian Shelf Flatfish as Inferred from Ichthyoplankton Survey Data and the Geographic Distribution of Mature Females

1988 ◽  
Vol 45 (10) ◽  
pp. 1674-1685 ◽  
Author(s):  
J. D. Neilson ◽  
E. M. DeBlois ◽  
P. C. F. Hurley
Keyword(s):  
Stock Assessment ◽  
Stock Structure ◽  
Stock Identification ◽  
Scotian Shelf ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea ◽  
Valuable Adjunct ◽  
Commercially Important ◽  
Eggs And Larvae ◽  
Sexually Mature

Data on egg distributions and timing of appearance of maximum egg densities were examined to determine the stock structure of three commercially important flatfish occurring on the Scotian Shelf: American plaice (Hippoglossoides platessoides), yellowtail flounder (Limanda ferruginea), and witch flounder (Glyptocephalus cynoglossus). Distributions of sexually mature females obtained from research vessel surveys were used to further support inferences concerning spawning location. Using such information, more than one stock of both American plaice and yellowtail flounder appear to occur on the Scotian Shelf, but no conclusions could be drawn concerning witch flounder. In the case of American plaice and yellowtail flounder, the existing means of geographic aggregation of data for stock assessment purposes do not appear to adequately represent stock structure. Little or no advection of eggs and larvae appears to occur on the Scotian Shelf, supporting the hypothesis that current-driven retention areas promote stock discreteness in that region. It was concluded that ichthyoplankton surveys can be a valuable adjunct to more traditional means of stock identification.

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