Eggs and Larvae of Northern Sand Lance (Ammodytes dubius) from the Scotian Shelf

1972 ◽  
Vol 29 (12) ◽  
pp. 1667-1671 ◽  
Author(s):  
J. S. Scott
Keyword(s):  
Growth Rates ◽  
Scotian Shelf ◽  
Sand Lance ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea ◽  
Dorsal Fin ◽  
The North ◽  
Mean Diameter ◽  
Fin Rays ◽  
Eggs And Larvae

Eggs from stomachs of yellowtail flounder (Limanda ferruginea) from Emerald Bank, south of Nova Scotia, were identified as those of northern sand lance, Ammodytes dubius. They were larger than those of other Ammodytes species, with a mean diameter of 1.05 mm. Ovarian eggs from ripe A. dubius were smaller (mean diameter 0.7 mm) with a unimodal distribution of egg diameters, indicating a single spawning each season.Larvae were widespread and abundant on the Scotian Shelf from February to April. They hatched at about 4-mm length and grew to about 25-mm length between February and May on Emerald Bank. Growth rates decreased to the north. Numbers and distribution of melanophores changed with larval length, but showed no differences in number at given length between geographical areas. Change in numbers of anal, caudal, and dorsal fin rays followed a pattern similar to that of corresponding melanophores.

Meristic Analyses of Atlantic Mackerel, Scomber scombrus, from the North American Coastal Populations

1969 ◽  
Vol 26 (9) ◽  
pp. 2537-2540 ◽  
Author(s):  
K. T. MacKay ◽  
E. T. Garside
Keyword(s):  
Atlantic Ocean ◽  
Growth Rates ◽  
Biochemical Evidence ◽  
Atlantic Mackerel ◽  
Scomber Scombrus ◽  
Dorsal Fin ◽  
The North ◽  
Breeding Populations ◽  
Fin Rays ◽  
Genetic Continuity

Mean counts of vertebrae, of anal and soft dorsal fin rays, and of peduncular finlets were identical in samples of Atlantic mackerel, Scomber scombrus, from the northern and southern breeding populations in the northwest Atlantic Ocean. This information, together with growth rates and biochemical evidence from the literature, suggests that although the populations occupy separate spawning regions there is sufficient exchange of individuals at other seasons to maintain considerable genetic continuity.

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.

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.

Age Composition and Growth of Yellowtail Flounder (Limanda ferruginea) from the Grand Bank

1974 ◽  
Vol 31 (11) ◽  
pp. 1800-1802 ◽  
Author(s):  
T. K. Pitt
Keyword(s):  
New England ◽  
Growth Curves ◽  
Scotian Shelf ◽  
Age Composition ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea ◽  
Similar Growth

The commercial yellowtail flounder (Limanda ferruginea) fishery on the Grand Bank is comprised of fish age 4–12 with the main contribution from 6–8-yr-olds. Comparison of Grand Bank yellowtail with those reported for the Scotian Shelf indicates similar growth curves. The New England stocks are significantly larger at comparable age probably because of higher water temperatures.

Taxonomic variability and criteria for distinguishing metamorphosing larval and juvenile stages of Limanda ferruginea and Hippoglossoides platessoides (Pisces: Pleuronectidae) from the Scotian Shelf

1980 ◽  
Vol 58 (2) ◽  
pp. 202-206 ◽  
Author(s):  
Louis Van Guelpen
Keyword(s):  
Stage Iv ◽  
Diagnostic Value ◽  
Scotian Shelf ◽  
Anal Spine ◽  
Limanda Ferruginea ◽  
Size At Metamorphosis ◽  
Fin Rays ◽  
Juvenile Stages ◽  
Gut Pigment ◽  
Hippoglossoides Platessoides

Metamorphosing larval and juvenile Limanda ferruginea and Hippoglossoides platessoides from the Scotian Shelf were examined to characterize their taxonomic variability and to establish the reliability of criteria for their identification. The species were found to be separable using several characters. Limanda ferruginea had 11 to 12 precaudal and 41 to 44 total vertebrae, 38 to 41 total myomeres, 51 to 67 anal fin rays and usually metamorphosed at less than 16 mm standard length (SL). Hippoglossoides platessoides had 13 to 14 precaudal and 45 to 48 total vertebrae, 44 to 47 total myomeres, 62 to 76 anal fin rays, and usually metamorphosed at greater than 25 mm SL. Anal fin ray counts and size at metamorphosis were of limited diagnostic value only. In addition, stage IV L. ferruginea usually had dark gut pigment and a visible modified first anal pterygiophore (anal spine), whereas H. platessoides had light gut pigment and no visible anal spine. Dark gut pigment also was diagnostic for juvenile L. ferruginea still possessing this character.

Intra-seasonal and inter-annual patterns in the demographics of sand lance and response to environmental drivers in the North Pacific

2019 ◽  
Vol 617-618 ◽  
pp. 221-244 ◽  
Author(s):  
MR Baker ◽  
ME Matta ◽  
M Beaulieu ◽  
N Paris ◽  
S Huber ◽  
...  
Keyword(s):  
North Pacific ◽  
Environmental Drivers ◽  
Sand Lance ◽  
The North ◽  
The North Pacific ◽  
Annual Patterns

CURRENT STATE AND DEVELOPMENT PERSPECTIVES OF THE CASPIAN SPRAT FISHERIES

2018 ◽  
pp. 69-75
Author(s):  
Tatiana Vasilievna Pomogaeva ◽  
Aliya Ahmetovna Aseinova ◽  
Yuriy Aleksandrovich Paritskiy ◽  
Vjacheslav Petrovich Razinkov
Keyword(s):  
Food Item ◽  
Growth Potential ◽  
North West ◽  
Marine Fishery ◽  
The North ◽  
Current State ◽  
West Part ◽  
Eggs And Larvae ◽  
Intensive Growth

The article presents annual statistical data of the Caspian Research Institute of Fishery. There has been kept track of the long term dynamics of the stocks of three species of Caspian sprat (anchovy, big-eyed kilka, sprat) and investigated a process of substituting a food item of sprats Eurytemora grimmi to a small-celled copepod species Acartia tonsa Dana. According to the research results, there has been determined growth potential of stocks of each species. Ctenophoran-Mnemiopsis has an adverse effect on sprat population by eating fish eggs and larvae. Ctenophoram - Mnemiopsis is a nutritional competitor to the full-grown fishes. The article gives recommendations on reclamation of stocks of the most perspective species - common sprat, whose biological characteristics helped not to suffer during Ctenophoram outburst and to increase its population during change of the main food item. Hydroacoustic survey data prove the intensive growth of common sprat biomass in the north-west part of the Middle Caspian. According to the results of the research it may be concluded that to realize the volumes of recommended sprat catch it is necessary to organize the marine fishery of common sprat at the Russian Middle Caspian shelf.

scholarly journals Resurrection of the genus Homalopteroides (Teleostei: Balitoridae) with a redescription of H. modestus (Vinciguerra 1890)

Zootaxa ◽  
2012 ◽  
Vol 3586 (1) ◽  
pp. 329 ◽  
Author(s):  
ZACHARY S. RANDALL ◽  
LAWRENCE M. PAGE
Keyword(s):  
Lateral Line ◽  
Head Length ◽  
Pectoral Fin ◽  
Caudal Fin ◽  
Dorsal Fin ◽  
Interorbital Width ◽  
Fin Rays ◽  
Orbital Rim ◽  
Pectoral Fin Rays ◽  
Pelvic Fin

The genus Homalopteroides Fowler 1905 is resurrected and distinguished from the genus Homaloptera van Hasselt 1823based on a combination of characters including a unique mouth morphology, dorsal-fin origin over pelvic fin,≤60 lateral-line scales, and≤30 predorsal scales. Species included in Homalopteroides are H. wassinkii (Bleeker 1853), H. modestus(Vinciguerra 1890), H. rupicola (Prashad & Mukerji 1929), H. smithi (Hora 1932), H. stephensoni (Hora 1932), H. weberi(Hora 1932), H. tweediei (Herre 1940), H. indochinensis (Silas 1953), H. nebulosus (Alfred 1969), H. yuwonoi (Kottelat1998), and possibly H. manipurensis (Arunkumar 1999). Homalopteroides modestus (Vinciguerra 1890) is a poorlyknown species that was originally described from the Meekalan and Meetan rivers of southern Myanmar. It occurs in theSalween, Mae Khlong, and Tenasserim basins, and can be distinguished from all other species of Homalopteroides by thecombination of caudal-fin pattern (black proximal and distal bars, median blotch), 15 pectoral-fin rays, pectoral-fin lengthgreater than head length, 5½–6½ scales above and 5–6 scales below the lateral line (to the pelvic fin), 39–44 total lateral-line pores, no axillary pelvic-fin lobe, pelvic fin not reaching anus, orbital length less than interorbital width in adult, and maxillary barbel reaching to or slightly past the anterior orbital rim.

Redescription of Mugil setosus Gilbert 1892 with comments on the occurrence of Mugil curema Valenciennes 1836 in the Pacific Ocean (Teleostei: Perciformes: Mugilidae)

Zootaxa ◽  
2019 ◽  
Vol 4671 (3) ◽  
pp. 396-406
Author(s):  
RICARDO BRITZKE ◽  
NAÉRCIO A. MENEZES ◽  
MAURO NIRCHIO
Keyword(s):  
Pacific Ocean ◽  
Pacific Coast ◽  
The Third ◽  
Dorsal Fin ◽  
The Pacific ◽  
Fin Rays ◽  
The Pacific Ocean ◽  
The Western Pacific ◽  
Pectoral Fin Rays ◽  
Pelvic Fin

Mugil setosus Gilbert 1892 was originally described by Gilbert based on specimens from Clarion Island, in the western and most remote of the Revillagigedo Islands, about 1,000 km off the western Pacific coast of Mexico. Examination of the type of material and recently collected specimens from Ecuador and Peru, resulted in the redescription provided herein. Diagnostic characters of the species were mainly: tip of the pelvic fin reaching beyond the vertical through the base of the third dorsal-fin spine, the pectoral-fin rays with ii+13–14 rays, the anterodorsal tip of second (soft) dorsal fin uniformly dark, and an external row of larger teeth, and more internally a patch of scattered smaller teeth, visible mainly in adults 150 mm SL. The expansion of geographic distribution of Mugil setosus and occurrence of Mugil curema Valenciennes 1836 in the Pacific Ocean are discussed. 

Navigobius asayake, a new species of ptereleotrine goby (Gobioidei: Microdesmidae) from Kagoshima, southern Japan

Zootaxa ◽  
2018 ◽  
Vol 4526 (3) ◽  
pp. 373
Author(s):  
MAKOTO OKAMOTO ◽  
HIROYUKI MOTOMURA
Keyword(s):  
New Species ◽  
Dorsal Fin ◽  
Southern Japan ◽  
Fin Rays ◽  
Eye Diameter ◽  
Yellow Stripe ◽  
Fin Length ◽  
A New Species ◽  
Pectoral Fin Rays ◽  
Pelvic Fin

A new species of ptereleotrine dartfish, Navigobius asayake, is described based on four specimens (45.0–52.1 mm in standard length: SL) collected from off the Satsuma Peninsula and Tanegashima island, Kagoshima, southern Japan. It is distinguished from other congeners by the following combination of characters: second dorsal-fin rays I, 18–19; anal-fin rays I, 19; pectoral-fin rays 21–22; gill rakers 5–6 + 13–15; head length 25.1–26.4% SL; eye diameter 8.6–10.0% SL; pelvic-fin length 15.2–16.1% SL; and a well-developed yellow stripe extending from behind upper part of eye to beneath first dorsal fin. 

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