Correction: Estimating the biomass of a mixed-species complex using hydroacoustics and catch data from the Bay of Fundy and Scotian Shelf summer ecosystem survey

2021 ◽  
pp. 1-1
Author(s):  
Allan J. Debertin
Keyword(s):  
Species Complex ◽  
Bay Of Fundy ◽  
Scotian Shelf ◽  
Mixed Species ◽  
Catch Data ◽  
Ecosystem Survey

Dispersal of early life stage haddock (Melanogrammus aeglefinus) as inferred from the spatial distribution and variability in length-at-age of juveniles

1999 ◽  
Vol 56 (12) ◽  
pp. 2350-2361 ◽  
Author(s):  
Nancy L Shackell ◽  
Kenneth T Frank ◽  
Brian Petrie ◽  
David Brickman ◽  
Jennifer Shore
Keyword(s):  
Early Life ◽  
Life Stage ◽  
Circulation Model ◽  
Early Life Stage ◽  
Melanogrammus Aeglefinus ◽  
Bay Of Fundy ◽  
Shelf Area ◽  
Scotian Shelf ◽  
Frequency Distributions ◽  
Haddock Melanogrammus Aeglefinus

In southwestern Nova Scotia, haddock (Melanogrammus aeglefinus) spawning is centered on Browns Bank where the variability of a partial gyre influences the distribution of eggs and larvae. An unknown proportion of each year-class is advected northward to the Bay of Fundy. We examined the variability in length at age 2 as an index of retention during early life. We assumed that early life stages that are retained in the Scotian Shelf area grow more slowly, while those that are advected into the Bay of Fundy grow more quickly. An optimization program was used to estimate the proportions of Scotian Shelf and Bay of Fundy sized components in length at age 2 bimodal frequency distributions for year-classes 1968-1993. The median proportion of Scotian Shelf sized fish was 0.89. A physical circulation model showed that the majority of particles released on Browns Bank drifted towards the Bay of Fundy. Results of the physical model and the size-based index differ partly because the former predicts the fate of passive particles, while the latter is an integrated measure of the proportion of fish retained and surviving. Survival is associated with high wind stress (r = -0.5, p = 0.011, n = 25) implying a higher probability of survival of those retained in the Scotian Shelf region.

Alimentary tract parasites of haddock (Melanogrammus aeglefinus L.) on the Scotian Shelf

1981 ◽  
Vol 59 (12) ◽  
pp. 2244-2252 ◽  
Author(s):  
J. S. Scott
Keyword(s):  
Alimentary Tract ◽  
Parasite Prevalence ◽  
Melanogrammus Aeglefinus ◽  
Bay Of Fundy ◽  
Scotian Shelf ◽  
Young Of The Year ◽  
Parasite Complex ◽  
Haddock Melanogrammus Aeglefinus ◽  
Hysterothylacium Aduncum ◽  
Biological Tags

Nineteen species of alimentary tract (including gall and swim bladders) parasites were found in haddock (Melanogrammus aeglefinus) on the Scotian Shelf, of which eight species were new Canadian records for haddock. Prevalence ranged up to 82.3% for Hysterothylacium aduncum and 70.9% for Echinorhynchus gadi, the most abundant parasites, with Lepidapedon rachion and Echinorhynchus gadi showing highest intensities (14.9 and 76.5, respectively). Prevalence decreased from summer to winter, was not related to sex of host, but showed geographical variation characterizing different geographical areas. The Bay of Fundy showed higher nematode and lower trematode abundance than the offshore Scotian Shelf which showed general clines in abundance of several species from southwest to northeast. There was no evidence of growth-related change in parasite prevalence in adult fish, but the parasite complex of young-of-the-year haddock indicated planktonic feeding, in contrast with benthic feeding in the adult. Site specificity within the alimentary tract was shown by several species. Echinorhynchus gadi changed its site seasonally. Lepidapedon rachion showed size differentiation in the gut, smaller trematodes occupying more anterior sites than larger. Only two parasite species offer prospects as biological tags, L. rachion and Myxidium bergense, but all may provide evidence of ecological, behavioral, seasonal and developmental changes in the host.

The distribution of right whales and Zooplankton in the Bay of Fundy, Canada

1989 ◽  
Vol 67 (6) ◽  
pp. 1411-1420 ◽  
Author(s):  
L. D. Murison ◽  
D. E. Gaskin
Keyword(s):  
Gulf Of Maine ◽  
Calanus Finmarchicus ◽  
Eubalaena Glacialis ◽  
Bay Of Fundy ◽  
Scotian Shelf ◽  
Transition Zones ◽  
Right Whale ◽  
Right Whales ◽  
Two Peaks ◽  
Copepod Biomass

Temperature, salinity, density of Zooplankton patches, and the abundance of right whales (Eubalaena glacialis glacialis) were measured concurrently during summer and autumn of 1983 and 1984 over the Grand Manan Basin, outer Bay of Fundy. Right whales appeared to exploit patches of copepods at densities greater than about 820/m3 (170 mg m−3). Patches were composed primarily of stage V Calanus finmarchicus at depths ≥ 100 m during daylight hours. Patch densities were similar in 1983 and 1984. Potential right whale feeding areas increased in extent from late July to October, with at least two peaks of copepod biomass occurring in 1984. Right whales appear to exploit euphausiid patches in the bay only incidentally; the whales departed in 1984 when euphausiid biomass was at a maximum. The topography of the basin, prevailing summer currents, and orientation of transition zones from mixed to stratified water all combine to facilitate accumulation of copepods from the Scotian Shelf and Gulf of Maine in the central lower Bay of Fundy. This area provides an important feeding ground for this stenophagous whale species.

scholarly journals Pollock (Pollachius virens) stock structure in the Canadian Maritimes inferred from mark-recapture studies

2006 ◽  
Vol 63 (4) ◽  
pp. 749-765 ◽  
Author(s):  
John D. Neilson ◽  
Wayne T. Stobo ◽  
Peter Perley
Keyword(s):  
Gulf Of Maine ◽  
Atlantic Coast ◽  
Fishing Effort ◽  
Management Unit ◽  
Bay Of Fundy ◽  
Stock Structure ◽  
Scotian Shelf ◽  
Current Management ◽  
Mark Recapture ◽  
Novel Method

Abstract The current management unit for pollock on the Canadian Atlantic coast is large compared with other gadoid resources, and includes the Scotian Shelf, the Bay of Fundy, and the Canadian portion of Georges Bank. Based on an analysis of mark-recapture studies conducted in the Canadian Maritimes and off southwestern Newfoundland and a review of other published studies providing data relevant to stock identification, the stock structure of pollock in Canadian Atlantic waters was re-assessed. The analysis also includes a novel method for using the spatial distribution of standardized fishing effort to predict the distribution of tag returns. It is concluded that three stocks co-occur within the current management unit. The larger population components exist in the western Scotian Shelf (including the eastern Bay of Fundy) and on the eastern Scotian Shelf. There is a coastal population in the western Gulf of Maine that overlaps into Canadian waters, but its size is likely to be relatively small. There is a need to revise the current management unit boundaries to protect the eastern Scotian Shelf stock, which on the basis of growth rate data, appears to be the least productive component of the pollock resource in Canadian Atlantic waters.

Demersal Fish Assemblages on the Scotian Shelf, Northwest Atlantic: Spatial Distribution and Persistence

1989 ◽  
Vol 46 (S1) ◽  
pp. s134-s152 ◽  
Author(s):  
Robin Mahon ◽  
Robert W. Smith
Keyword(s):  
Environmental Variables ◽  
Fishery Management ◽  
Fish Assemblages ◽  
Environmental Gradients ◽  
Demersal Fish ◽  
Assemblage Structure ◽  
Bay Of Fundy ◽  
Scotian Shelf ◽  
Species Groups ◽  
Temporal And Spatial

This study is based on 18 surveys, 12 in summer, and three each in spring and fall, with bottom trawls over the Scotian Shelf and Bay of Fundy. The data analysis sequence was: temporal and spatial aggregation of trawl sets; estimation of interspecies and intersite distance indices; clustering and ordination of sites and species, and discrimination of site groups using environmental variables. Nine species-groups, and 10 site-groups were defined, and displayed in a two-way table. Depth and temperature were the environmental variables most strongly associated with differences in assemblage structure among site-groups. Changes in assemblage structure from one area to another were distinct but apparently gradual, with no sharp assemblage boundaries. This pattern is expected if species are distributed independently on environmental gradients, rather than if assemblages consist of highly co-evolved, interdependent species. The observed spatial patterns were highly persistent through time. There are regions which are relatively homogeneous with regard to species composition and which can therefore be useful in dealing with bycatch problems. However, this study does not indicate the existence of discrete assemblages which might be appropriate as ecologically based fishery management units.

Sources of Water Contributed to the Bay of Fundy by Surface Circulation

1960 ◽  
Vol 17 (2) ◽  
pp. 181-197 ◽  
Author(s):  
Dean F. Bumpus
Keyword(s):  
Surface Water ◽  
Annual Cycle ◽  
Gulf Of Maine ◽  
Surface Flow ◽  
Bay Of Fundy ◽  
Georges Bank ◽  
Scotian Shelf ◽  
Eastern Side ◽  
Surface Circulation ◽  
Surface Drift

The returns from the 35,000 drift bottles launched in the Gulf of Maine area since 1919 have been analyzed to determine the annual cycle of surface drift. The source of surface flow into the Bay of Fundy expands from a minimum during January in the offing of the eastern side of the bay to a maximum in May which includes most of Georges Bank, the Gulf of Maine and the southwestern Scotian Shelf, then commencing in September gradually contracts toward the minimum.Secular variations in the removal of surface water from the Bay of Fundy, indicative of changes in the Maine eddy, were noted during 1957 and 1958.

Matrix Analysis of Co-occurrences of Fishes of the Scotian Shelf and Bay of Fundy

1989 ◽  
Vol 46 (2) ◽  
pp. 191-197 ◽  
Author(s):  
J. S. Scott
Keyword(s):  
Shallow Water ◽  
Species Abundance ◽  
Matrix Analysis ◽  
Bay Of Fundy ◽  
Trawl Survey ◽  
Scotian Shelf ◽  
Sea Raven ◽  
Longhorn Sculpin ◽  
Silver Hake ◽  
Shallow Water Species

Numbers of co-occurrences of 29 common fishes of the Bay of Fundy and Scotian Shelf were derived from annual research trawl survey data for the summers of 1970–79 and the spring, summer, and autumn seasons of 1980–84. Matrices prepared from the data were used to examine degrees of association between different species and seasonal and geographical variation in the associations. Three categories of associations were identified: shallow water with a dominant winter flounder (or yellowtail flounder) – longhorn sculpin – sea raven assemblage; middepth with a dominant cod – haddock – thorny skate assemblage; deepwater characteristic species but with no strong recurring assemblages. Strength of co-occurrence was directly related to species abundance and changes corresponded to known seasonal movements in several species, including silver hake, spiny dogfish, and pollock. In general, the strength and number of co-occurrences decreased from southwest to northeast along the Scotian Shelf. The Bay of Fundy was exceptional, with strong co-occurrences of shallow-water species and poor representation of deepwater fishes.

Pollock (Pollachius virens (L.)) in the Bay of Fundy

1963 ◽  
Vol 20 (5) ◽  
pp. 1267-1314 ◽  
Author(s):  
D. H. Steele
Keyword(s):  
Growth Rate ◽  
Gulf Of Maine ◽  
Biased Sampling ◽  
Bay Of Fundy ◽  
Large Fish ◽  
Scotian Shelf ◽  
Western Atlantic ◽  
Dominant Type ◽  
Sublittoral Zone ◽  
Mature Fish

Observations made on the biology of the pollock in the western Atlantic, and primarily in the Bay of Fundy region of the northern Gulf of Maine, are presented. The largest landings of pollock in the western Atlantic are made in this area (ICNAF Division 4X). The best catches of large fish are made at temperatures above 1.1 °C, at depths of 20–100 fathoms (35–185 m) on the edges of shoals and banks where food is abundant. Spawning occurs in the winter and takes place in the southern Gulf of Maine and probably also on the Scotian Shelf, but not in the northern Gulf of Maine. The Bay of Fundy pollock are recruited from spawning in the southern Gulf of Maine and possibly on the Scotian Shelf. The pollock found in the Bay of Fundy appear to remain separate from those of the southern Gulf of Maine and the Scotian Shelf in the summer, but migrate south, spawn and probably mix with those of the southern Gulf of Maine, and possibly also those of the Scotian Shelf in the winter. The offshore pollock have a regular gradient in size across the Bay of Fundy; large fish (65–85 cm) are caught on the New Brunswick side, medium-sized fish (60–75 cm) around Grand Manan and smaller fish (45–60 cm) off western Nova Scotia. Catches with different size compositions are also found in small areas. Segregation by size into schools is therefore an important feature of pollock behaviour. The growth rate of pollock is rapid until the approximate time of sexual maturity, which occurs at ages of 4–7 years (50–65 cm) in the males and 5–7 years (55–70 cm) in the females. The growth rate of the immature and young, mature fish is similar to that recorded for other areas, but the older, mature fish appear to grow more slowly. It is suggested that this discrepancy may be due to biased sampling of the old fish in the Bay of Fundy due to the segregation by size. The 0-class pollock found in the shallow, sublittoral zone feed mainly on algae-inhabiting organisms and to a lesser extent on plankton. The 1-year-olds in the same location have a similar diet but consume a greater proportion of planktonic animals. The larger, offshore pollock in the Bay of Fundy are predominantly plankton eaters, and the euphausiid Meganyctiphanes norvegica is by far the most important organism in the diet. On the Scotian Shelf and in the Laurentian Channel fish is the dominant type of food, except for the smallest sizes of pollock.

scholarly journals Two new species of encrusting sponge (Porifera, family Crellidae) from eastern Canada

2021 ◽  
pp. 760-772
Author(s):  
Claire Goodwin ◽  
Curtis Dinn ◽  
Ekaterina Nefedova ◽  
Frauke Nijhof ◽  
Francisco Javier Murillo ◽  
...  
Keyword(s):  
New Species ◽  
East Coast ◽  
Barents Sea ◽  
Type Locality ◽  
Type Material ◽  
Bay Of Fundy ◽  
Scotian Shelf ◽  
Eastern Canada ◽  
Two New Species

Two new species of Crellidae Dendy, 1922 from the east coast of Canada are described. The first is Crella (Pytheas) cutis sp. nov., a massively encrusting species of Crella (Pytheas) collected from depths of 84 to 249 m in the Gulf of St. Lawrence and on the Scotian Shelf. The second is Crellomima mehqisinpekonuta sp. nov., a thinly encrusting sponge found at diving depths in the Bay of Fundy. We also report the first records of Crellomima derma Hentschel, 1929 from outside the type locality (Barents Sea). All known species of Crellomima are reviewed based on type material.

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