Latitudinal phenotypic variation in the southernmost trichomycterid, the catfish Hatcheria macraei: an amalgam of population divergence and environmental factors

2018 ◽  
Vol 124 (4) ◽  
pp. 718-731 ◽  
Author(s):  
Juan Mauro Chiarello-Sosa ◽  
Miguel Ángel Battini ◽  
Juan Pablo Barriga
Keyword(s):  
Life History ◽  
Environmental Factors ◽  
Body Shape ◽  
Latitudinal Gradient ◽  
Population Divergence ◽  
Meristic Characters ◽  
Dorsal Fin ◽  
Fin Ray ◽  
Life History Patterns ◽  
Fin Length

Abstract Body shape and meristic characters are highly variable phenotypic aspects in fish, and in most cases are related to phylogeography, environmental factors and life history patterns. Our main goals here were to evaluate morphological and meristic characters in five populations of the catfish Hatcheria macraei living at different latitudes across Patagonia, and to assess the importance of environmental and phylogenetic variables in determining body shape. The present study reveals great morphological variation among populations distributed along the latitudinal gradient. We found that the highest levels of variation in external morphological features were in peduncle height, dorsal fin length and anus position. This variation in body shape, quantified by geometric morphometrics, was mostly explained by the phylogenetic relationship between populations, stream gradient and spawning temperature. In contrast, the meristic characters, such as vertebral and fin ray numbers, except for dorsal fin ray number, were negatively related to latitude and positively to spawning temperature.

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

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.

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. 

Luciogobius yubai, a new species of gobioid fish (Teleostei: Gobiidae) from Japan

Zootaxa ◽  
2019 ◽  
Vol 4657 (3) ◽  
pp. 565-572
Author(s):  
YUJI IKEDA ◽  
KAZUAKI TAMADA ◽  
KENTAROU HIRASHIMA
Keyword(s):  
New Species ◽  
Posterior Part ◽  
Pectoral Fin ◽  
Dorsal Fin ◽  
Fin Ray ◽  
Eye Diameter ◽  
Dermal Flaps ◽  
Fin Length ◽  
A New Species ◽  
Pelvic Fin

A new gobioid fish Luciogobius yubai sp. nov. is described based on specimens collected from Wakayama and Shizuoka Prefectures, Japan. This species is distinguished from congeners by the following combination of characters; second dorsal-fin I, 9, anal-fin I, 10, pectoral-fin 17 or 18, vertebrate number 16+19=35, the first space between anterior two pterygiophores of second dorsal-fin placed the neural spines of vertebrae 17–18 or 17, four to seven developed dermal flaps under the eye longitudinally, posterior part of eye ridge protruded posteriorly, pectoral-fin with a long uppermost free ray, eye diameter 7.3–10.6 % of head length, pectoral-fin length 14.4–16.9 % of standard length (SL) , second dorsal-fin length 9.7–11.8 % SL, anal-fin ray length 9.1–11.1 % SL, pelvic-fin length 7.3–10.8 % SL, head and body with brownish orange coloration when alive or fresh.

A new species of the greeneye genus Chlorophthalmus (Teleostei: Chlorophthalmidae) from the central North Pacific

Zootaxa ◽  
2019 ◽  
Vol 4555 (3) ◽  
pp. 396
Author(s):  
KYOJI FUJIWARA ◽  
HIDETOSHI WADA ◽  
HIROYUKI MOTOMURA
Keyword(s):  
New Species ◽  
Lateral Line ◽  
North Pacific ◽  
Pectoral Fin ◽  
Dorsal Fin ◽  
Lower Jaw ◽  
Fin Ray ◽  
Seamount Chain ◽  
Fin Length ◽  
Central North Pacific

Chlorophthalmus imperator sp. nov. (Teleostei: Chlorophthalmidae) is described on the basis of nine specimens (98.1–174.8 mm SL) from the Emperor Seamount Chain in the central North Pacific. The new species is characterized by the following combination of characters: 49–51 lateral-line scales; 6 scale rows above lateral line; 3 + 19–22 = 22–25 (modally 22) gill rakers; outermost tooth patches of lower jaw with 6–14 large thorn-shaped teeth, the tips projecting in advance of lower-jaw profile; lower-jaw symphysis with two distinct moderately-sized projections; tongue without teeth; pelvic-fin origin vertically below 4th or 5th (usually 5th) dorsal-fin ray base; head length 26.7–28.9 (mean 27.7) % SL; snout length 6.9–7.7 (7.3) % SL; horizontal orbit diameter 11.9–12.9 (12.3) % SL; upper-jaw length 11.7–13.2 (12.6) % SL; maxillary depth 3.1–3.8 (3.4) % SL; pre-dorsal-fin length 34.2–36.6 (35.3) % SL; pre-pectoral-fin length 27.3–29.8 (27.9) % SL; anus to anal-fin origin length 27.3–29.9 (28.5) % SL; pectoral-fin length 21.0–24.9 (22.7) % SL. 

The influence of environmental factors on early life history patterns of flounders

1998 ◽  
Vol 40 (1-2) ◽  
pp. 19-32 ◽  
Author(s):  
John Selden Burke ◽  
Masahiro Ueno ◽  
Yousuke Tanaka ◽  
Harvey Walsh ◽  
Tsuneo Maeda ◽  
...  
Keyword(s):  
Life History ◽  
Environmental Factors ◽  
Early Life ◽  
Early Life History ◽  
Life History Patterns

scholarly journals Morphological variation in an anopthalmic specimen of Sperata seenghala (Sykes, 1839) from Brahmaputra River, Assam, India

2016 ◽  
Vol 8 (2) ◽  
pp. 905-909
Author(s):  
Jyotish Barman ◽  
A.K. Jaiswar ◽  
S.K. Chakraborty ◽  
B.K. Bhattacharjya ◽  
Gopalkrishna Gopalkrishna
Keyword(s):  
Morphological Traits ◽  
Urban Runoff ◽  
Body Width ◽  
Meristic Characters ◽  
Body Depth ◽  
Dorsal Fin ◽  
Sperata Seenghala ◽  
Inland Water Transport ◽  
Fin Length ◽  
Pelvic Fin

The present investigation reports the variation observed in morphological traits of an anopthalmic specimen of Sperata seenghala (Sykes, 1839) (168.9 mm in standard length) from Assam. Thirty morphometric and six meristic characters of the abnormal specimen were studied and compared with normal specimens to observe variation in the morpho-meristic traits, if any. The proportionate pre-pectoral length (28.5 mm), length of dorsal fin base (15.0 mm), pelvic fin length (15.5 mm), distance between urino-genital openings and anal fin base (14.0 mm) and body depth at pectoral fin base (12.0 mm) of the abnormal specimen was found to be higher compared to that of the normal specimens (23.8 – 26.5 mm; 12.2 – 14.1 mm; 11.1 – 14.7 mm; 10.9 – 12.4 mm and 8.9 – 9.9 mm, respectively); while the dorsal to adiposedistance (12.8 mm) and body width at cleithrum (41.5 mm) was lower than the normal specimens (13.7 – 16.7 mm and 44.0 – 50.0 mm, respectively). No marked variation was observed in the meristic characters. Pollution due to urban runoff, sewage discharge and oil spill from inland water transport facilities adversely affecting the river water quality could be the reason for such deformity. The overall growth performance of the fish does not seem to be affected by these anomalies.

A new sisorid catfish of the genus Pseudolaguvia (Teleostei: Sisoridae) from Nagaland, north-eastern India

Zootaxa ◽  
2021 ◽  
Vol 5082 (1) ◽  
pp. 77-86
Author(s):  
JAYASIMHAN PRAVEENRAJ ◽  
BALAJI VIJAYAKRISHNAN ◽  
AKUM LIMA ◽  
SHANTABALA DEVI GURUMAYUM
Keyword(s):  
New Species ◽  
The Body ◽  
Eastern India ◽  
Pectoral Fin ◽  
Caudal Peduncle ◽  
Body Depth ◽  
Dorsal Fin ◽  
Fin Ray ◽  
North Eastern ◽  
Fin Length

Pseudolaguvia vespa, new species, is described from the Tsücha River, Mokokchung district, Nagaland, India. The new species can be distinguished from congeners in having the following combination of characters: length of dorsal-fin spine 12.3–16.8% SL, a smooth anterior edge of the dorsal-fin spine, caudal peduncle depth 9.0–10.5% SL, body depth at anus 15.6–17.7% SL, caudal fin length 20.7–24.5% SL, pectoral fin length 20.1–24.1% SL, interorbital distance 22.7–28.1% SL, thoracic adhesive apparatus extending to midway between base of last pectoral-fin ray and pelvic-fin origin, and live specimens with two irregular, chrome-yellow bands on the body.  

Development of larval snailfishes (Pisces: Cyclopteridae: Liparidinae) from the western North Atlantic

1986 ◽  
Vol 64 (10) ◽  
pp. 2294-2316 ◽  
Author(s):  
Kenneth W. Able ◽  
Michael P. Fahay ◽  
Douglas F. Markle
Keyword(s):  
North Atlantic ◽  
Canadian Arctic ◽  
Length Ratio ◽  
Body Proportions ◽  
Stages Of Development ◽  
Meristic Characters ◽  
Pigmentation Pattern ◽  
Dorsal Fin ◽  
Fin Ray ◽  
Eye Diameter

Development of 9 of the 14 snailfishes in the western North Atlantic is described. Identification of larvae of Careproctus reinhardi, six species of Liparis (L. atlanticus, L. coheni, L. fabricii, L. gibbus, L. inquilinus, L. tunicatus), and two species of Paraliparis (P. calidus, P. copei) is based on body proportions, pigmentation, meristic characters, and early development of adult characters. Liparis fabricii is distinct from all other Liparis in having the darkest pigmentation at all sizes, largest sizes at all development stages, and unique body proportions. Liparis atlanticus and L. inquilinus are dissimilar to all other Liparis in the relatively smaller sizes at comparable stages of development and the presence of a notched dorsal fin. They differ from each other in pigmentation pattern and eye diameter/disk length ratio. Liparis coheni and L. gibbus are relatively smaller at all stages of development than L. fabricii but larger than L. atlanticus and L. inquilinus, and lack a notch in the dorsal fin. Liparis gibbus differs from L. coheni in pigmentation pattern and in having a larger eye diameter/disk length ratio. Pronounced geographic variation in pigmentation occurs between L. gibbus from the Canadian Arctic and those from the Gulf of St. Lawrence. The two Paraliparis and C. reinhardi possess adult fin ray counts and pigmentation at hatching and are easily distinguishable. Development in the latter species, which hatch as demersal juveniles, is distinctly different from that in Liparis, which hatch early in development (preflexion) and are pelagic until caudal formation is nearly complete (late flexion). For each species we include larval diagnostic characters, descriptive development (morphometric, pigmentation, meristic), and geographic and seasonal distribution of larvae.

scholarly journals MEGANTHIAS KINGYO (KON, YOSHINO AND SAKURAI, 2000) (PERCIFORMES: SERRANIDAE) FROM BITUNG, NORTH SULAWESI, INDONESIA: FIRST RECORD FROM THE SOUTHWESTERN PACIFIC OCEAN

2016 ◽  
Vol 40 (2) ◽  
pp. 41-47 ◽  
Author(s):  
Teguh Peristiwady ◽  
Wulan Koagouw ◽  
Jianguo Du ◽  
Petrus Christianus Makatipu
Keyword(s):  
Lateral Line ◽  
First Record ◽  
Base Length ◽  
Caudal Peduncle ◽  
Body Depth ◽  
Dorsal Fin ◽  
North Sulawesi ◽  
Fin Ray ◽  
Fin Length ◽  
Pelvic Fin

Eight specimens of Meganthias kingyo were collected from Bitung, North Sulawesi, Indonesia between 2008 - 2010. The specimens were caught from about 70-150 m off Lembeh Island. M. kingyo differs from M. natalensis by having the following characteristics: pores lateral line scales (43 vs. 49); pectoral rays (16 vs. ii.14); body depth (47.1 vs. 51.9); head length (31.0 vs. 38.2), body depth (47.1 vs. 52.9), caudal peduncle depth (12.1 vs. 14.2), pectoral fin length (28.0 vs. 34.3), pelvic fin length (33.6 vs. 31.1), anal fin base length (19.4 vs. 22.2), caudal fin length (66.9 vs. 35.3) and longest dorsal fin ray (48.5 vs. 27.4). Previously, this species has been reported from Houzan-sone, off Miyako and Yaeyama Islands in Okinawa, Japan; and herein is recorded from off Lembeh Island, North Sulawesi, Indonesia.

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