Median length at sexual maturity of halibut, cusk, longhorn sculpin, ocean pout, and sea raven in the Maritimes area of the Northwest Atlantic

1982 ◽  
Vol 60 (6) ◽  
pp. 1326-1330 ◽  
Author(s):  
Terry D. Beacham
Keyword(s):  
Sexual Maturity ◽  
Scotian Shelf ◽  
Median Length ◽  
Hippoglossus Hippoglossus ◽  
Northwest Atlantic ◽  
Sea Raven ◽  
Longhorn Sculpin ◽  
Hemitripterus Americanus

The length at which 50% of the individuals were mature was calculated for some Northwest Atlantic groundfish species. Median length at maturity for halibut (Hippoglossus hippoglossus) on the Scotian Shelf declined from 84 cm for males during 1959–1964 to 66 cm during 1970–1979. Median lengths at maturity for females declined from 98 to 70 cm. Ranges of median lengths (centimetres) at maturity for other species were as follows: cusk (Brosme brosme), male 48–56, female 47–56; longhorn sculpin (Myoxocephalus octodecemspinosus), male 24–29, female 23–25; ocean pout (Macrozoarces americanus), male 45, female 28; and sea raven (Hemitripterus americanus), male 36, female 28.

Swimming Endurance of Some Northwest Atlantic Fishes

1966 ◽  
Vol 23 (3) ◽  
pp. 341-347 ◽  
Author(s):  
F. W. H. Beamish
Keyword(s):  
Swimming Speed ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Winter Flounder ◽  
Pseudopleuronectes Americanus ◽  
Northwest Atlantic ◽  
Sea Raven ◽  
Longhorn Sculpin ◽  
Hemitripterus Americanus ◽  
Swimming Endurance

Endurance was determined in relation to swimming speed and temperature for Atlantic cod, Gadus morhua Linnaeus, redfish, Sebastes marinus (Linnaeus), winter flounder, Pseudopleuronectes americanus (Walbaum), and to swimming speed at 8 C for longhorn sculpin, Myoxocephalus octodecimspinosus (Mitchill), sea raven, Hemitripterus americanus (Gmelin), and ocean pout, Macrozoarces americanus (Block and Schneider).In an activity chamber at a swimming speed of 4 body lengths per second (BL/sec) Atlantic cod swam for about equally long periods at 5 and 8 C, and redfish and winter flounder each about equally long at 5, 8, and 11 C. The pattern was similar for higher speeds. At 14 C winter flounder swam longer at 6 BL/sec than at the lower temperatures. For swimming speeds less than 4 BL/sec all species swam longer at the higher temperatures. At 8 C, the only temperature at which all species were tested, endurance at comparable swimming speeds was greatest for winter flounder, followed by cod, redfish, longhorn sculpin, ocean pout, and sea raven.

Movements of Atlantic Halibut (Hippoglossus hippoglossus) in the Canadian North Atlantic

1988 ◽  
Vol 45 (3) ◽  
pp. 484-491 ◽  
Author(s):  
Wayne T. Stobo ◽  
John D. Neilson ◽  
Patricia G. Simpson
Keyword(s):  
North Atlantic ◽  
Atlantic Halibut ◽  
Scotian Shelf ◽  
Hippoglossus Hippoglossus ◽  
Spawning Grounds ◽  
Northwest Atlantic ◽  
Preferred Direction ◽  
Pacific Halibut ◽  
Hippoglossus Stenolepis ◽  
Direction Of Movement

The results of Atlantic halibut (Hippoglossus hippoglossus) tagging experiments conducted in Northwest Atlantic Fisheries Organization (NAFO) Subareas 3 and 4 between 1958 and 1973 were reexamined. Data from the 230 recaptures indicated a tendency for fish released on the Scotian Shelf to move to the northeast, while fish released on the Newfoundland Grand Bank showed no preferred direction of movement. The Laurentian Channel does not appear to be a barrier to migration for this species. Small (<75 cm) fish moved further than larger fish. The seemingly limited movement by larger fish may be due to acyclic annual migration between feeding and spawning grounds, similar to that suggested for Pacific halibut (Hippoglossus stenolepis). The extensive movement of Atlantic halibut throughout most of the Canadian Northwest Atlantic suggests that a single area would be the most feasible management unit, encompassing the Scotian Shelf and southern Grand Bank regions.

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.

Corynosoma wegeneri (Acanthocephala: Polymorphida) and Pseudoterranova decipiens (Nematoda: Ascaridoidea) Larvae in Scotian Shelf Groundfish

1992 ◽  
Vol 49 (10) ◽  
pp. 2062-2069 ◽  
Author(s):  
David J. Marcogliese ◽  
Gary McClelland
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Host Record ◽  
Melanogrammus Aeglefinus ◽  
Scotian Shelf ◽  
New Host ◽  
New Host Record ◽  
Pseudoterranova Decipiens ◽  
Sea Raven ◽  
Longhorn Sculpin

We examined larvae of the seal parasites Corynosoma wegeneri and Pseudoterranova decipiens in various fish species collected from Western and Sable Island banks between February 1989 and October 1990. Atlantic cod (Gadus morhua), haddock (Melanogrammus aeglefinus), American plaice (Hippoglossoides platessoides), yellowtail flounder (Pleuronectes ferrugineus), windowpane (Scophthalmus aquosus), longhorn sculpin (Myoxocephalus octodecemspinosus), and sea raven (Hemitripterus americanus) were infected by both parasites, longhorn sculpin being a new host record for C. wegeneri. Only C. wegeneri occurred in winter flounder (Pleuronectes americanus), and neither parasite was found in northern sand lance (Ammodytes dubius) or capelin (Mallotus villosus). The two parasites were most numerous in sea raven and longhorn sculpin. Corynosoma wegeneri was more prevalent in fish sampled in 1989–90 than in previous surveys of Atlantic cod and haddock from the Scotian Shelf. Pseudoterranova decipiens and C. wegeneri occurred throughout the sampling area, but small fishes in the vicinity of Sable Island had the heaviest sealworm infections, and both parasites in longhorn sculpin declined with distance from Sable Island. Increases of C. wegeneri in groundfish, like recent increased levels of P. decipiens infection on the Scotian Shelf, can be attributed to the dramatic growth of the grey seal (Halichoerus grypus) population on Sable Island.

Heat transfer between fish and ambient water

1976 ◽  
Vol 65 (1) ◽  
pp. 131-145 ◽  
Author(s):  
E. D. Stevens ◽  
A. M. Sutterlin
Keyword(s):  
Body Wall ◽  
Sea Water ◽  
The Body ◽  
Direct Transfer ◽  
Major Fraction ◽  
Metabolic Heat ◽  
Sea Raven ◽  
Before And After ◽  
Ventral Aorta ◽  
Hemitripterus Americanus

1. The ability of fish gills to transfer heat was measured by applying a heat pulse to blood in the ventral aorta and measuring it before and after passing through the gills of a teleost, Hemitripterus americanus. 2. 80–90% of heat contained in the blood is lost during passage through the gills. 3. The fraction of heat not lost during passage through the gills is due to direct transfer of heat between the afferent and efferent artery within the gill bar. 4. The major fraction of metabolic heat (70 - 90%) is lost through the body wall and fins of the sea raven in sea water at 5 degrees C; the remainder is lost through the gills.

Seasonality, sex ratio, spawning frequency and sexual maturity of the opakapaka Pristipomoides filamentosus (Perciformes: Lutjanidae) from the Main Hawaiian Islands: fundamental input to size-at-retention regulations

2018 ◽  
Vol 69 (2) ◽  
pp. 325 ◽  
Author(s):  
Meagan A. Luers ◽  
Edward E. DeMartini ◽  
Robert L. Humphreys
Keyword(s):  
Sexual Maturity ◽  
Comprehensive Evaluation ◽  
Hawaiian Islands ◽  
Fork Length ◽  
Minimum Size ◽  
Recreational Fisheries ◽  
Median Length ◽  
Spawning Frequency ◽  
Stock Status ◽  
Body Sizes

The crimson jobfish Pristipomoides filamentosus (locally known as ‘opakapaka’ in Hawaii) is a deep-water eteline lutjanid that supports important commercial and recreational fisheries in Hawaii and throughout much of the Indo-Pacific region. It is one of the most commonly caught species of the ‘Deep-7’ bottomfish species complex in the commercial bottomfish fishery of Hawaii. However, there are currently no validated estimates of median body sizes at sexual maturity that can be used in a comprehensive evaluation of the species’ stock status within Hawaiian bottomfish fisheries. Herein we provide size-at-maturity estimates for the species in the main Hawaiian Islands: median length at maturity of 40.7-cm fork length (FL; 95% confidence interval (CI) 40.3–41.2cm) for females and 34.3cm FL (95% CI 33.3–35.3cm) for males, with respective equivalent median weight-at-maturity estimates of ~1.17 and ~0.70kg (2.58 and 1.55 lb). We suggest these newly available data be seriously considered in any future evaluations of minimum size regulations, currently set at ~0.45kg (1 lb) regardless of sex, for the species’ fisheries in Hawaii.

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