scholarly journals Stock Discrimination of Capelin (Mallotus villosus) in the Northwest Atlantic

1984 ◽  
Vol 5 ◽  
pp. 199-205 ◽  
Author(s):  
R K Misra ◽  
J E Carscadden
Keyword(s):  
Mallotus Villosus ◽  
Northwest Atlantic ◽  
Stock Discrimination ◽  
Capelin Mallotus Villosus

Multivariate Analysis of Meristic Characters of Capelin (Mallotus villosus) in the Northwest Atlantic

1980 ◽  
Vol 37 (4) ◽  
pp. 725-729 ◽  
Author(s):  
J. E. Carscadden ◽  
R. K. Misra
Keyword(s):  
Multivariate Analysis ◽  
Discriminant Function ◽  
Multivariate Analyses ◽  
Mature Male ◽  
Mallotus Villosus ◽  
Meristic Characters ◽  
Northwest Atlantic ◽  
Statistical Procedures ◽  
Stock Discrimination ◽  
Capelin Mallotus Villosus

Counts were made on 11 meristic characters of mature male capelin. The Bonferroni method identified three characters that exhibited significant annual differences. Interpopulation differences were compared using the remaining eight characters, and three capelin stocks were identified. Other studies have tentatively identified at least four stocks, and based on this analysis, meristic characters show only limited promise in separating capelin stocks in the Northwest Atlantic. However, the sequence of statistical procedures used in this study offers potential in other stock discrimination studies.Key words: capelin, Mallotus villosus; meristics, multivariate analyses, Bonferroni method, discriminant function

Direct assessment of post-spawning survival of female capelin, Mallotus villosus

2001 ◽  
Vol 81 (2) ◽  
pp. 307-312 ◽  
Author(s):  
S.R. Flynn ◽  
B.S. Nakashima ◽  
M.P.M. Burton
Keyword(s):  
Visual Assessment ◽  
Mallotus Villosus ◽  
Northwest Atlantic ◽  
Histological Technique ◽  
Direct Assessment ◽  
Physiological Evidence ◽  
Capelin Mallotus Villosus ◽  
Potential Impact ◽  
Post Spawning ◽  
Made In

Assessment of spawning survival for female capelin Mallotus villosus (Pisces: Osmeriformes) greater than 12 cm in length was made in the autumn of 1995–1997 comparing a histological technique with existing methods. An intensive macroscopic visual assessment of selected samples from 1995, 1996 and 1997 revealed that 10, 20 and 40% of the females were recovering from spawning respectively each year. Histological assessments of the same fish revealed that 20% in 1995, and nearly 60% of the fish in 1996 and 1997 showed physiological evidence of previous spawning. The proportion of recovering spawners increased with both length and age of the fish. One sample from the Northwest Atlantic Fisheries Organization area of 2J during October 1997 contained nearly 90% recovering fish. The potential impact of the fishery in light of the variability in post-spawning survival of the iteroparous female capelin is discussed.

Ecosystem changes and the effects on capelin (Mallotus villosus), a major forage species

2001 ◽  
Vol 58 (1) ◽  
pp. 73-85 ◽  
Author(s):  
J E Carscadden ◽  
K T Frank ◽  
W C Leggett
Keyword(s):  
Physical Environment ◽  
Population Biology ◽  
Single Species ◽  
Zooplankton Abundance ◽  
Mallotus Villosus ◽  
Northwest Atlantic ◽  
Commercial Fish ◽  
Commercial Exploitation ◽  
Capelin Mallotus Villosus ◽  
The Impact

Capelin (Mallotus villosus), an important forage and commercial fish in the Northwest Atlantic, has exhibited dramatic changes in its biology during the 1990s, coincident with extreme oceanographic conditions and the collapse of major groundfish stocks. Commercial exploitation has not been a serious factor influencing the population biology of capelin in the area. The overall consumption of capelin has declined as predator stock abundances have changed. Data on plankton are sparse, but there appears to have been a decline in zooplankton abundance during the 1990s, and at the same time, a phytoplankton index increased. The impact of the changes in the physical environment has been the subject of previous studies and these are reviewed. The relative impacts of four factors, commercial exploitation, predation, food availability, and the physical environment, on the changes in capelin biology are discussed in the context of capelin as a single species and in the context of the ecosystem. The overall patterns suggest the existence of a "trophic cascade" within the distributional range of capelin in the Northwest Atlantic during the 1990s primarily driven by declines in major finfish predators.

Gametogenesis in capelin, Mallotus villosus (Müller), in the northwest Atlantic Ocean

2003 ◽  
Vol 81 (9) ◽  
pp. 1511-1523 ◽  
Author(s):  
S R Flynn ◽  
M P.M Burton
Keyword(s):  
Atlantic Ocean ◽  
Reproductive Biology ◽  
Mallotus Villosus ◽  
Northwest Atlantic ◽  
Important Prey ◽  
Resource Managers ◽  
Capelin Mallotus Villosus ◽  
Ovarian Wall ◽  
History Of ◽  
Post Spawning

Capelin (Mallotus villosus) can be regarded as the most important prey item in the northwest Atlantic Ocean. The health and availability of this species are of fundamental importance for the successful growth and reproduction of many other fishes, whales, and birds. In spite of the clear need to understand this species, the life history of the capelin, especially its reproductive biology, is not well understood. This study substantially improves our knowledge of the reproductive biology of capelin and should be of particular interest to resource managers and administrators. Capelin gonads were analysed over three successive seasons using fish collected during beach spawning (June and July 1993, July 1994, July 1995) or trawled between spawnings, with 11 separate samples (fall, winter, and spring from October 1993 to June 1995). Few immature fish were collected in the trawls; 13/130 (10%) males and 3/150 (2%) females. No recovering (postspawning) males were found in the trawls, but 8/150 (5.3%) recovering females were identified on the basis of large residual oocytes (ovulated or unovulated) and (or) (in the fall) a thicker ovarian wall. Recovering females were identified as late as 10 months post spawning on the basis of residual oocytes. The essential semelparity of males was supported by a lack of apparent spermatogonia during advanced spermatogenesis, whereas the females' capacity to spawn in a subsequent year (iteroparity) was confirmed by the presence of small nonvitellogenic oocytes when other cells were in late oogenesis, in addition to the identification of recovering fish. Oocytes were separable into four stages (potential year classes) and changes occurred in all oocyte stages throughout the cycle of oogenesis. Gametogenesis was more advanced in longer fish, indicating that larger fish spawn earlier than smaller fish.

scholarly journals Genetic Structure of Capelin (Mallotus villosus) in the Northwest Atlantic Ocean

PLoS ONE ◽  
2015 ◽  
Vol 10 (3) ◽  
pp. e0122315 ◽  
Author(s):  
Ellen L. Kenchington ◽  
Brian S. Nakashima ◽  
Christopher T. Taggart ◽  
Lorraine C. Hamilton
Keyword(s):  
Genetic Structure ◽  
Atlantic Ocean ◽  
Mallotus Villosus ◽  
Northwest Atlantic ◽  
Capelin Mallotus Villosus

Laminiscus n.g. (Monogenea: Gyrodactylidae) from capelin, Mallotus villosus (Müller), (Pisces: Osmeridae) in the northwest Atlantic with redescriptions of L. gussevi n. comb., Gyrodactyloides petruschewskii, and G. andriaschewi

1983 ◽  
Vol 61 (2) ◽  
pp. 298-306 ◽  
Author(s):  
Jónbjörn Pálsson ◽  
Mary Beverley-Burton
Keyword(s):  
Functional Morphology ◽  
Type Species ◽  
Generic Diagnosis ◽  
Mallotus Villosus ◽  
Northwest Atlantic ◽  
Capelin Mallotus Villosus ◽  
Icelandic Waters

Three species of viviparous monogenea, Gyrodactyloides petruschewskii Bykhovskii, 1947, G. andriaschewi Bykhovskii and Polyanskii, 1953, and Laminiscus gussevi (Bykhovskii and Polyanskii, 1953) n. comb., from the gills of capelin, Mallotus villosus (Müller), taken in the northwest Atlantic and Icelandic waters are redescribed in order to provide a better understanding of the functional morphology of the haptor. Laminiscus n.g. is proposed with L. gussevi n. comb., which is transferred from Gyrodactyloides, as type-species. Laminiscus is distinguished by having a sclerotized plate which supports the haptor and in lacking the ventral suction disc and associated sclerites which characterize Gyrodactyloides. Two other species, which do not parasitize capelin, are included in Laminiscus: L. strelkowi (Bykhovskii and Polyanskii, 1953) n. comb., and L. dogiele (Zhukov, 1960) n. comb. An emended generic diagnosis for Gyrodactyloides is included. All three specific reports are new geographic records.

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