Cod spawning on a migration highway in the north-west Atlantic

Rose, George A.

doi:10.1038/366458a0

Cited by 299 publications

(311 citation statements)

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“…This insured that smoothing of the data resulting from averaging of points within the circle was on the same scale as the fishing set. In addition, this dimension is on the scale of cod schools as reported by Rose (1993). The procedure is performed for every quadcell within the study area and an integration of classified quadcells forms a density surface.…”

Section: Methodsmentioning

confidence: 99%

“…Harris (1990) noted the paucity of such information for this and other Atlantic stocks. Reviews of northern cod biology by Lear (1986), deYoung and Rose (1993) and Taggart et al (1994) show that much of the field research on Labrador and north-east Newfoundland Shelf cod had occurred during the summer or fall period. For example, Bishop et al (1993) and Lilly (1994) described the distribution of cod, the latter with respect to their prey, but these studies took place in the fall prior to reproduction.…”

Section: Introductionmentioning

confidence: 99%

“…Understanding the distribution and movements of adult cod during reproduction is important because spatial dynamics of spawning activity relative to stock range can affect reproductive success (deYoung and Rose, 1993). Through a reappraisal of past and recent work, they postulated that a southerly shift in the distribution of northern cod had occurred commencing in 1988.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Bishop et al (1993) and Lilly (1994) described the distribution of cod, the latter with respect to their prey, but these studies took place in the fall prior to reproduction. Lear (1984Lear ( , 1986, Lear and Green (1984) and Rose (1993), using tagging and acoustics, described migratory activity of northern cod during the fall and spring. For the inshore areas, landings data yielded only limited information on the summer distribution (Davis, 1991;Lear and Parsons, 1993).…”

Section: Introductionmentioning

confidence: 99%

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Recent changes in the winter distribution and movements of northern Atlantic cod (Gadus morhuaLinnaeus, 1758) on the Newfoundland-Labrador Shelf

Kulka

Wroblewski

Narayanan

1995

ICES Journal of Marine Science

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S. 1995. Recent changes in the winter distribution and movements of northern Atlantic cod (Gadus morhua Linnaeus, 1758) on the Newfoundland-Labrador Shelf. -ICES J. mar. Sci., Using catch data collected by fishery observers from the otter trawl fleet, we describe changes in the winter distribution of cod on the Newfoundland-Labrador Shelf between 1980 and 1992. We determined the relative abundance of cod in three areas of winter aggregation: south-east of Hamilton Bank, south-east of Belle Isle Bank and south-east of Funk Island Bank. The principal finding was that the cod, during their reproductive period, exhibited significant changes in distribution and behaviour, well before the stock showed signs of collapse. There were three indicators of these changes. First, there was a progressive disappearance of fish from the north with time. Most of the biomass was located in the Hamilton Bank area before 1984. By 1989, most of the fish were found at the Belle Isle Bank and south-east of Funk Island Bank locations and by 1991, only to the south (Funk Island Bank). Second, movements of the prespawning/spawning schools became more limited. Compared with the extensive along-shelf migrations, often covering distances of about 100 km, observed in earlier years, the fish schools after 1989 exhibited less movement to the north. Density of fish in the schools was highest in 1990. By 1991, the schools remained nearly stationary around 49 30 N, near the southern end of their distribution. Third, the schools spread over an increasingly greater range of depths. The greatest density of fish as reflected by high catch rates was generally observed no deeper than 600 m between 1980 and 1988 . By 1989, substantial catch rates were observed as deep as 1100 m, particularly to the north although catches continued to be considerable at the shallower depths. These changes in distribution and behaviour were generally coincident with the occurrence of anomalously cold ocean temperatures and heavy ice conditions, but no direct link between these changes and the environment was evident.1995 International Council for the Exploration of the Sea

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Recent changes in the winter distribution and movements of northern Atlantic cod (Gadus morhuaLinnaeus, 1758) on the Newfoundland-Labrador Shelf

Kulka

Wroblewski

Narayanan

1995

ICES Journal of Marine Science

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“…In spring, cod migrated inshore to feed, primarily on capelin, utilizing several deep 43 channels that undercut the outer parts of the cold Labrador Current (Lear 1984;Rose 1993). The 44 stock complex also included smaller groups of inshore residents that overwintered and spawned 45 in the colder (at times sub-zero) coastal habitats in winter, spring and early summer (Templeman 46 and offshore, cod "hyper-aggregated" in large shoals in their southernmost migration channel, the 52 D r a f t Bonavista Corridor, as the stock declined (Rose 1993;Rose and Kulka 1999). By 1993, few cod 53 remained there (Rose et al 1994), and by 1994, few were evident anywhere within the former 54…”

mentioning

confidence: 99%

Otolith chemistry and redistributions of Northern cod: evidence of Smith Sound – Bonavista Corridor connectivity

Neville

Rose

Rowe

et al. 2018

Can. J. Fish. Aquat. Sci.

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Stable oxygen isotope assays of otoliths (δ18Ooto) from migrant Atlantic cod (Gadus morhua Linnaeus, 1758) that overwintered in Smith Sound, Newfoundland, during 1995–2006 differed from those of nonmigrating summer residents and cod from Placentia Bay and Halibut Channel but did not differ from those of cod from the adjacent offshore Bonavista Corridor in summer. All fish sampled were of the 1990 year class (founder of the Smith Sound aggregation) at ages 8–10 years. Hence, overwintering Smith Sound and summering Bonavista Corridor cod likely experienced similar temperatures and salinities in each year of life, representing different migration stages of an intermixed group. Moreover, predictions of δ18Ooto from near-bottom ocean temperatures and salinities differed between inshore and offshore sites and, in general, matched observed signatures of inshore and offshore cod. The Bonavista Corridor cod, however, were an exception, having δ18Ooto signatures suggestive of inshore exposure. Our findings provide direct evidence of metapopulation structure in the Northern cod and are consistent with offshore rebuilding having been spurred by dispersal of cod from inshore Smith Sound.

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