Meristic variation in beaked redfishes, Sebastes mentella and S. fasciatus, in the Northwest Atlantic

1982 ◽  
Vol 39 (12) ◽  
pp. 1664-1685 ◽  
Author(s):  
I-H. Ni
Keyword(s):  
Cluster Analysis ◽  
Geographic Variation ◽  
Meristic Characters ◽  
Northwest Atlantic ◽  
Depth Variation ◽  
Dorsal Fin ◽  
Fin Ray ◽  
Fin Rays ◽  
Meristic Variation ◽  
Sebastes Mentella

The distribution of Northwest Atlantic beaked redfishes, Sebastes mentella and S. fasciatus, has been confused for the past several decades. Sebastes fasciatus has been reported as having lower meristic counts than S. mentella. Meristic elements of 33 301 vertebrae, 22 622 anal fin ray, and 16 290 dorsal fin ray counts were utilized to examine the yearly, depth, and geographic variation of meristics in beaked redfishes. Data collected from specimens caught off West Greenland, Baffin Island, Labrador, Newfoundland, Quebec, and Nova Scotia were analyzed by 100-m-depth intervals. Temporal and depth variation were examined by the χ2-test of independence on meristic frequencies. Geographic variation was evaluated using the modes and mean values in the meristic frequency histograms. Cluster analysis of meristic frequencies displayed the dendrographic affinities and the distance matrix among division–depth blocks.Temporal variation indicated a mixture of vertebral frequency patterns which varied with depth and area. Depth variation and geographic clines were found for each of these meristic characters; the shallow and southern waters were dominated by counts of 29, 14–13, and 7 for vertebrae, dorsal fin rays, and anal fin rays, respectively, whereas deep and northern waters were dominated by 30, 15–14, and 8–9. These results suggested that S. fasciatus occurs on the Nova Scotian Shelf and Grand Bank whereas S. mentella is largely found in Baffin Bay, Labrador waters, and the Gulf of St. Lawrence. The common names of S. mentella and S. fasciatus are discussed. Additionally, five hypothetical stocks of beaked redfishes based on meristic patterns are proposed for management purposes.Key words: Sebastes mentela, S. fasciatus, redfish, meristic variation, distribution, cluster analysis

scholarly journals Scorpaena decemradiata new species (Teleostei: Scorpaenidae) from the Gulf of Aqaba, northern Red Sea, a species distinct from Scorpaena porcus

2018 ◽  
Vol 82 (3) ◽  
pp. 169
Author(s):  
Ronald Fricke ◽  
Daniel Golani ◽  
Brenda Appelbaum-Golani ◽  
Uwe Zajonz
Keyword(s):  
New Species ◽  
Red Sea ◽  
Gulf Of Aqaba ◽  
Pectoral Fin ◽  
Dorsal Fin ◽  
Lower Jaw ◽  
Fin Ray ◽  
Fin Rays ◽  
Northern Red Sea ◽  
Scorpaena Porcus

The scorpionfish Scorpaena decemradiata n. sp. is described from off the coast of Israel in the Gulf of Aqaba, northern Red Sea. The new species is similar to S. porcus Linnaeus, 1758, but is characterized by dorsal fin spines XII, soft dorsal fin rays 10 (the last divided at base); pectoral fin rays 16, uppermost branched pectoral fin ray is the second; lacrimal with 2 spines over maxilla that point at nearly right angle from each other, the posterior pointing ventrally and slightly anteriorly; occipital pit well developed; anteriormost mandibular lateral-line pores small, separated; scales ctenoid; 59-62 scale rows in longitudinal series; scales absent on chest and pectoral fin base; and cirri developed over entire head and body, but no cirri on lower jaw. An updated checklist of the species of the genus Scorpaena Linnaeus, 1758 and a key to the species of the eastern Atlantic, Mediterranean Sea and Red Sea are presented.

Validity of Lepadichthys misakius (Tanaka 1908) and redescription of Lepadichthys frenatus Waite 1904 (Gobiesocidae: Diademichthyinae)

Zootaxa ◽  
2019 ◽  
Vol 4551 (3) ◽  
pp. 275 ◽  
Author(s):  
KYOJI FUJIWARA ◽  
HIROYUKI MOTOMURA
Keyword(s):  
Morphological Changes ◽  
Lateral View ◽  
Valid Species ◽  
Pectoral Fin ◽  
Dorsal Fin ◽  
Posterior Nostril ◽  
Fin Ray ◽  
Fin Rays ◽  
Disc Size ◽  
Anterior Posterior

The clingfishes Lepadichthys frenatus Waite 1904 and Lepadichthys misakius (Tanaka 1908) are both redescribed as valid species, although the latter has previously been regarded as a junior synonym of the former. Lepadichthys frenatus and L. misakius are easily distinguished from their congeners by the following combination of characters: 14–19 dorsal-fin rays; 12–14 anal-fin rays; disc size moderate, its length 15.1–20.8 % of standard length (SL); and dorsal, anal and caudal fins connected by membranes. Lepadichthys misakius can be distinguished from L. frenatus by having 25–28 (modally 26 or 27) pectoral-fin rays [vs. 27–29 (29) in L. frenatus]; the upper end of the gill membrane level with the 5th to 8th (usually 6th) pectoral-fin ray base in lateral view [vs. 6th to 8th (7th)]; the lower 8th to 11th (9th) pectoral-fin ray base attached to the disc base by membrane [vs. 10th to 12th (11th)]; 7–11 (9) gill rakers on each arch [vs. 11–14 (12)]; anterior, posterior and least interorbital widths 9.0–11.8 (mean 10.7), 13.4–16.9 (15.3) and 3.2–8.8 (6.2) % SL, respectively [vs. 8.4–10.2 (9.4), 12.1–14.7 (13.5) and 2.8–5.9 (4.8) % SL, respectively]; and NC2 (nasal canal pore) usually located between the anterior and posterior margins of the posterior nostril (vs. usually located before the posterior nostril anterior margin). Morphological changes with growth of the two species are described in detail and a lectotype designated for L. frenatus. 

A new species of Schindler's fish (Teleostei: Gobiidae: Schindleria) from the Malay Archipelago (Southeast Asia), with notes on the caudal fin complex of Schindleria

Zootaxa ◽  
2018 ◽  
Vol 4531 (1) ◽  
pp. 95
Author(s):  
HARALD AHNELT ◽  
MICHAEL SAUBERER
Keyword(s):  
New Species ◽  
Body Depth ◽  
Caudal Fin ◽  
Gobiid Fish ◽  
Dorsal Fin ◽  
Malay Archipelago ◽  
Fin Ray ◽  
Fin Rays ◽  
A New Species ◽  
Radial Plate

Schindleria macrodentata sp. nov., a new species of the paedomorphic gobiid fish genus Schindleria, is described from the Malay Archipelago. The two specimens were collected in 1929 during the “Dana Expedition” in the Molucca Sea between Sulawesi and Halmahera islands (00°29′N, 125°54′E) (Indonesia) and in the Sulu Sea close to Panay Island (11°43’N, 121°43′E) (Philippines). The new species is characterized by a slender body (body depth at pectoral fin base 3.6–3.7 % of SL and at anal fin origin 3.9–4.8 % of SL), a long second dorsal fin (first dorsal fin absent) originating distinctly anterior to the origin of the anal fin (predorsal length 61.8–65.2 % of SL and preanal length 71.7–75.8 % of SL), a short tail (from anus to tip of longest caudal fin ray) (22.1 % of SL), 19–20 dorsal fin rays and 10 anal fin rays, first anal fin ray below 9th dorsal fin ray, few large, widely spaced teeth in the upper and the lower jaws (7 on the premaxilla and 6 on the dentary), an elongated pectoral radial plate (length 3.7–4.5 % of SL) and, in the caudal skeleton, a procurrent ray with an additional spiny process at its base. No distinct urogenital papilla and no pigmentation on body are developed. In this study we present three morphological traits until now not considered as diagnostic characters for Schindleria, the shape of the pectoral radial plate, the shape of the last procurrent caudal spine and the shape of the arch formed by the lower jaw. We also discuss the caudal-fin skeleton of Schindleria, a character developing beyond the larval stages. The record of S. macrodentata is the first of the genus Schindleria for Indonesia and, at more than 100 km distant to the next shore, it is the first offshore record of a Schindler's fish. 

Geographic Variation in the Brook Stickleback, Culaea inconstans, and Notes on Nomenclature and Distribution

1969 ◽  
Vol 26 (9) ◽  
pp. 2431-2447 ◽  
Author(s):  
Joseph S. Nelson
Keyword(s):  
Geographic Variation ◽  
Northwestern Part ◽  
Clinal Variation ◽  
Body Depth ◽  
Spine Length ◽  
Culaea Inconstans ◽  
Dorsal Fin ◽  
Fin Rays ◽  
Historical Origin ◽  
Brook Stickleback

Clinal variation in dorsal and pelvic spine lengths was observed in the brook stickleback, Culaea inconstans, in an examination of 1366 specimens from 62 localities. Mean spine length was longest in the Wisconsin to Ohio area and generally decreased to the west, north, and east of this area. Shortest spines were observed in the northwestern part of the range of the species. A population in New Mexico, believed to be relict, was highly variable, but most specimens had long spines. Pelvic spines, and the supporting skeleton, were absent in most specimens from five localities in Alberta. Pelvic skeleton size and body depth were generally greatest in the area east of Wisconsin and least in the northwestern part of the range. Although C. inconstans is generally described as being naked, a series of about 30–36 small bony scutes was found along the lateral line in all populations examined. No marked geographic variation was observed in number of pectoral rays, caudal rays, soft dorsal-fin rays, soft anal-fin rays, gill rakers, scutes, or vertebrae. The nomenclature and distribution of C. inconstans are reviewed. The historical origin of clinal variation in spine length is discussed.

Meristic Differences between Spring- and Autumn-Spawning Atlantic Herring (Clupea harengus harengus) from Southwestern Newfoundland

1971 ◽  
Vol 28 (4) ◽  
pp. 553-558 ◽  
Author(s):  
L. S. Parsons ◽  
V. M. Hodder
Keyword(s):  
Clupea Harengus ◽  
Atlantic Herring ◽  
Gill Rakers ◽  
Dorsal Fin ◽  
Fin Ray ◽  
Significant Difference ◽  
Fin Rays ◽  
Developmental Rates ◽  
Clupea Harengus Harengus ◽  
Gill Raker

Numbers of vertebrae, gill rakers, and of pectoral, anal, and dorsal fin rays of spring- and autumn-spawning Atlantic herring (Clupea harengus harengus Linnaeus) in 10 samples from the coastal waters of southwestern Newfoundland were compared. There was no significant difference (P > 0.05) between mean vertebral numbers of spring and autumn spawners. Mean numbers of gill rakers and of pectoral, anal, and dorsal fin rays were all higher (P < 0.01) for autumn spawners than for spring spawners with gill-raker and pectoral fin-ray numbers exhibiting the greatest degree of difference. It is suggested that the differences in fin-ray numbers between spring and autumn spawners are related to water temperatures during larval development and to differences in developmental rates of spring- and autumn-hatched larvae.

Redescription of Astyanax stenohalinus Messner, 1962 (Characiformes: Characidae), a poorly known species from Argentina and Uruguay

Zootaxa ◽  
2010 ◽  
Vol 2434 (1) ◽  
pp. 60 ◽  
Author(s):  
ADRIANA E. ALMIRÓN ◽  
JORGE R. CASCIOTTA ◽  
MARÍA DE LAS M. AZPELICUETA ◽  
MARCELO LOUREIRO
Keyword(s):  
Type Material ◽  
Dorsal Fin ◽  
Fin Ray ◽  
Fin Rays

Astyanax stenohalinus Messner, 1962 is redescribed based on type material and new specimens collected in many localities of Argentina and Uruguay. This species is distinguished by a combination of the following characters: possession of hooks in all fins of males, teeth not expanded distally, two or three maxillary teeth, 37–39 perforated scales in the lateral series, 25–30 branched anal-fin rays, and anal-fin origin located before a vertical through last dorsal-fin ray insertions.

OBSERVATIONS ON MERISTIC VARIATION IN NINESPINE STICKLEBACKS, PUNGITIUS PUNGITIUS, REARED AT DIFFERENT TEMPERATURES

1962 ◽  
Vol 40 (7) ◽  
pp. 1237-1247 ◽  
Author(s):  
C. C. Lindsey
Keyword(s):  
High Temperature ◽  
Gasterosteus Aculeatus ◽  
Pungitius Pungitius ◽  
Pectoral Fin ◽  
Vertebral Count ◽  
Fin Ray ◽  
Fin Rays ◽  
Different Temperatures ◽  
Meristic Variation ◽  
Pectoral Fin Rays

Eggs of 10 pairs of wild ninespine sticklebacks from Hobson's Brook near Cambridge, England, were reared under various controlled temperatures. Temperature for optimum survival to hatching differed between genotypes. Ninety young were examined for counts of vertebrae, spines, and dorsal, anal, and pectoral fin rays. Survivors at high temperature had markedly more vertebrae than survivors at low. Curves of temperature against vertebral count may be V-shaped for each genotype, and optimum survival temperature may produce lowest vertebral count. More basal supports to the dorsal and anal fins and spines were produced at high temperature. Disruptions in one-to-one serial conformity between ray or spine, basal, and vertebral series became progressively commoner at higher rearing temperatures. Parents showed positive correlation between dorsal and anal fin ray counts and number of caudal scutes. Comparisons are made with Gasterosteus aculeatus.

Clarias gracilentus, a new walking catfish (Teleostei: Clariidae) from Vietnam and Cambodia

Zootaxa ◽  
2011 ◽  
Vol 2823 (1) ◽  
pp. 61 ◽  
Author(s):  
HEOK HEE NG ◽  
DANG KHANH HONG ◽  
NGUYEN VAN TU
Keyword(s):  
Species Complex ◽  
Head Width ◽  
Body Depth ◽  
Dorsal Fin ◽  
Fin Ray ◽  
Fin Rays ◽  
Eye Diameter ◽  
Process Length ◽  
Fin Length ◽  
Pelvic Fin

Clarias gracilentus, a new Southeast Asian walking catfish species, is described from Phu Quoc Island (Vietnam) off the coast of southeastern Cambodia and from mainland southeastern Cambodia. The new species is a member of the C. nieuhofii species complex, and can be distinguished from congeners in the complex in having a combination of: head width 11.9–12.9% SL, distance between the occipital process and the base of the first dorsal-fin ray 5.3–8.4% SL, pectoral-fin length 8.5–10.1% SL, body depth at anus 8.2–11.7% SL, pelvic-fin length 4.3–5.5% SL, length of anal-fin base 60.0–63.9% SL, eye diameter 5.4–7.2% HL, interorbital distance 42.7–48.0% HL, occipital-process length 7.8–14.7% HL, 96–101 dorsal-fin rays, 84–89 anal-fin rays and 80–84 total vertebrae.

scholarly journals Short Communication: Presence of the vulnerable freshwater goby Sicyopus auxilimentus (Gobiidae, Sicydiinae) on Sangihe Island, Indonesia

2021 ◽  
Vol 22 (2) ◽  
Author(s):  
VERYL HASAN ◽  
FITRI SIL VALEN ◽  
R. ADHARYAN ISLAMY ◽  
Maheno Widodo ◽  
ADITYA MIRZAPAHLEVI SAPTADJAJA ◽  
...  
Keyword(s):  
Genetic Distance ◽  
Short Communication ◽  
Migration Route ◽  
Pectoral Fin ◽  
Meristic Characters ◽  
Caudal Peduncle ◽  
Caudal Fin ◽  
Dorsal Fin ◽  
Fin Rays ◽  
Freshwater Goby

Abstract. Hasan V, Valen FS, Islamy RA, Widodo MS, Saptadjaja AM, Islam I. 2021. Short Communication: Presence of the vulnerable freshwater goby Sicyopus auxilimentus (Gobiidae, Sicydiinae) on Sangihe Island, Indonesia. Biodiversitas 22: 571-579. A single specimen of freshwater goby Sicyopus auxilimentus was photographed and collected using fish traps between 8 and 15 September 2019 in the Laine waterfall, Sangihe island district, North Sulawesi Province, Indonesia. S. auxilimentus is amphidromous that live in both freshwater and marine environments. This species is currently listed as Vulnerable (VU) within the IUCN Red List Status. The specimen was identified as male S. auxilimentus based on the coloration of the preserved specimen: background yellowish; scale edges brown; posterior flanks and caudal peduncle orange; first dorsal fin black, second dorsal fin dusky black; pectoral fin slightly brown; ventral fin slightly dusky; anal fin blackish; caudal fin dusky brown. Specific morphological features were as follows: the base of the first dorsal fin was not connected to the second dorsal fin base; distance between the base of first and second dorsal fin was generally less than half of eye diameter; ventral fin rays were fused to belly only between fifth rays; posterior margin of caudal fins rays was rounded; scales were all ctenoid; scales appeared on the caudal peduncle, and between anal and second dorsal fins; anterior to which, scales became widely spaced and did not imbricate. Meristic characters were as follows: first dorsal fin rays VI; second dorsal fin rays I+9; ventral fin rays I+5; pectoral-fin rays 14; anal-fin rays I+9; caudal-fin rays 13; scales in lateral series 13; scales in zigzag series 7; scales in transverse series backward 7; scales in transerves series forward 4. This finding is considered the first record in Sulawesi and the fifth from Indonesian waters after findings in Halmahera, Java, Bali and Lombok. This record enhances the understanding of the distribution of S. auxilimentus in Indonesian waters. Monitoring is needed to assess the possibility of Sangihe Island being a growth ground, spawning ground, and/or on the migration route of S. auxilimentus. In the Laine waterfall, Sangihe island, freshwater conditions were as follows: salinity 3.5 psu, temperature 23-25°C, and dissolved oxygen 7.7-9.2 mg/l, which were ideal habitat for S. auxilimentus. S. auxilimentus from Sangihe Island, had 0.000 genetic distance than from S. auxilimentus from Bali, while the next closest genetic distance was S. zosterophorus at genetic distance of 0.090. In addition to onsite conservation, domestication programs are needed to increase commercial availability without depending on natural catches.

Revision of the diagnostic characters of two morphologically similar snook species, Centropomus viridis and C. nigrescens (Carangiformes: Centropomidae)

Zootaxa ◽  
2021 ◽  
Vol 4915 (3) ◽  
pp. 326-338
Author(s):  
JUAN MANUEL MARTÍNEZ-BROWN ◽  
JAIME NAVARRO-FLORES ◽  
FRANCISCO JAVIER GARCÍA-RODRÍGUEZ ◽  
LEONARDO IBARRA-CASTRO ◽  
CARMEN ELVIRA VARGAS-PERALTA ◽  
...  
Keyword(s):  
Morphological Character ◽  
Molecular Data ◽  
Genetic Identification ◽  
Morphological Similarity ◽  
Meristic Characters ◽  
Morphometric Characters ◽  
Dorsal Fin ◽  
Fin Ray ◽  
Gas Bladder ◽  
External Character

Historically, the taxonomic identification of the two snook species, Centropomus viridis and C. nigrescens, has been challenging due to their morphological similarity and the inconsistency of the characters used for diagnosis. Therefore, this study aimed to evaluate the usefulness of the morphologic, meristic, and morphometric characters currently being used to identify C. viridis and C. nigrescens, based on molecular data. The results showed that the gas-bladder shape (i.e., C. viridis with diverticula and C. nigrescens without diverticula) was the only morphological character univocally related to genetic identification. Likewise, geometric morphometrics separated two groups; each corresponds to only one of two genetically (and gas bladder shape) identified species. Of all the meristic characters examined, only the second dorsal fin ray count (nine for C. viridis and ten for C. nigrescens) was related to the gas bladder shape and genetic identity; therefore, it is the only external character with a diagnostic utility to separate each species. 

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