scholarly journals Assessing the migratory histories, trophic positions, and conditions of lake sturgeon in the St. Croix and Mississippi Rivers using fin ray microchemistry, stable isotopes, and fatty acid profiles

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Jeffrey R. Ziegeweid ◽  
Michelle R. Bartsch ◽  
Lynn A. Bartsch ◽  
Steven J. Zigler ◽  
Robert J. Kennedy ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Mississippi River ◽  
Lake Sturgeon ◽  
Fish Length ◽  
Pectoral Fin ◽  
Food Web Structure ◽  
Fin Ray ◽  
Study Results ◽  
Fin Rays ◽  
Pectoral Fin Rays

Abstract Background Reproducing populations of invasive carps (Hypophthalmichthys spp.) could alter aquatic food webs and negatively affect native fishes in the Mississippi National River and Recreation Area (MISS) and the St. Croix National Scenic Riverway (SACN). However, proposed invasive carp barriers may also threaten populations of native migratory fishes by preventing movements of fish between rivers that are necessary for life history requirements. In this study, nonlethal chemical techniques were used to provide baseline data related to the condition, trophic position, and migratory histories of lake sturgeon (Acipenser fulvescens) captured in the Mississippi and St. Croix Rivers. Results Fish length and weight measurements and age estimates determined from pectoral fin rays demonstrated that lake sturgeon from the Mississippi River had greater lengths-at-age compared to sturgeon from the St. Croix River. However, length–weight relations were similar for sturgeon from the Mississippi and St. Croix Rivers. Lake sturgeon captured from different locations had distinguishable fatty acid signatures, and stable isotope analyses demonstrated that lake sturgeon from the Mississippi River generally feed at a higher trophic level than those in the St. Croix River. Strontium-to-calcium ratios (Sr:Ca) from fin ray cross sections indicated that sturgeon captured from the Mississippi River had higher Sr:Ca values than sturgeon captured from the St. Croix River, and natal origins and capture locations were not significantly different among sturgeon captured within individual rivers. Most sturgeon were captured in water with a similar Sr:Ca signature as their natal waters, indicating that there is some separation between populations of lake sturgeon in the St. Croix and Mississippi Rivers. However, Sr:Ca data indicated substantial variation in movement patterns among individual lake sturgeon, indicating that populations interact through migrations of individual fish between rivers. Conclusions Study results provide baseline condition and food web structure index data for assessing changes in lake sturgeon populations should invasive carps become established in these areas of the Mississippi and St. Croix Rivers. Controlled-exposure and telemetry studies would help verify and enhance the relations between Sr:Ca signatures in water and lake sturgeon pectoral fin rays to further assess mixing of sturgeons between rivers.

scholarly journals Description of two new species of the catfish genus Trichomycterus from southeastern Brazil (Siluriformes: Trichomycteridae)

Zootaxa ◽  
2004 ◽  
Vol 744 (1) ◽  
pp. 1 ◽  
Author(s):  
ALINE R. ALENCAR ◽  
WILSON J.E.M. COSTA
Keyword(s):  
New Species ◽  
River Basins ◽  
Morphological Features ◽  
Southeastern Brazil ◽  
Pectoral Fin ◽  
Fin Ray ◽  
Two New Species ◽  
Fin Rays ◽  
Santa Maria ◽  
Pectoral Fin Rays

Two new species of Trichomycterus from isolated small river basins of southeastern Brazil are described: T. pantherinus, new species, from the Rio Santa Maria da Vit ria basin, and T. caudofasciatus, new species, from the Rio Itabapoana basin. Both new species are diagnosed by a combination of morphological features, also occurring in T. alternatus and T. longibarbatus, including number of pectoral-fin rays, odontodes and branchiostegal rays, long filamentous first pectoral-fin ray and wide opercular patch of odontodes. Trichomycterus pantherinus differs from other congeners by possessing a light orangish yellow flank with dark brown to black rounded spots. Trichomycterus caudofasciatus is distinguished from other species of the genus by having four gray bars on the caudal fin.

Scorpaena bulacephala, a new species of scorpionfish (Scorpaeniformes: Scorpaenidae) from the northern Tasman Sea

Zootaxa ◽  
2005 ◽  
Vol 1043 (1) ◽  
pp. 17 ◽  
Author(s):  
HIROYUKI MOTOMURA ◽  
PETER R. LAST ◽  
GORDON K. YEARSLEY
Keyword(s):  
New Species ◽  
Morphological Changes ◽  
The Body ◽  
Pectoral Fin ◽  
Tasman Sea ◽  
Fin Ray ◽  
Fin Rays ◽  
Pacific Species ◽  
A New Species ◽  
Pectoral Fin Rays

A new species of small-sized scorpionfish, Scorpaena bulacephala, is described on the basis of seven specimens collected from off Norfolk and Lord Howe Islands, northern Tasman Sea, southwestern Pacific Ocean, at depths of 86–113 m. The new species is closely related to a Hawaiian endemic species, S. colorata. The two species are distinguished from other Indo–Pacific species of Scorpaena by the following combination of characters: exposed cycloid scales covering the anteroventral surface of the body and pectoral-fin base, the lateral surface of the lacrimal without spines, and 17 pectoral-fin rays. The new species differs from S. colorata in having 39–44 longitudinal scales rows and relatively short fin spines and rays, especially short longest pectoral-fin ray (31.5–33.5% of standard length). Morphological changes with growth and sexual dimorphism of the new species are also discussed.

Age Determination of Sockeye (Oncorhynchus nerka) and Chum (O. keta) Salmon from Examination of Pectoral Fin Rays

1969 ◽  
Vol 26 (5) ◽  
pp. 1199-1203 ◽  
Author(s):  
H. T. Bilton ◽  
D. W. Jenkinson
Keyword(s):  
Chum Salmon ◽  
Oncorhynchus Nerka ◽  
Age Determination ◽  
Annual Rings ◽  
Pectoral Fin ◽  
Fin Ray ◽  
Fin Rays ◽  
Ray Methods ◽  
Pectoral Fin Rays

Ages of adult sockeye and chum salmon were estimated from examination of the second anterior pectoral fin ray, and were compared with estimates from their scales or otoliths. For sockeye, only the ocean age could be estimated. Freshwater annual rings could not be distinguished on their fin rays even though they were present on their scales or otoliths. In general, the three methods provided the same estimates of ocean age. Agreement of estimates of ocean age by one to five readers ranged from 78.9 to 98.8%. For chum salmon, the scale and fin ray methods generally provided the same estimates of total age. Agreement of estimates of total age by one or two readers ranged from 73.8 to 99.3%.

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.

scholarly journals Taxonomic review of the genus Trichomycterus Valenciennes (Siluriformes: Trichomycteridae) from the laguna dos Patos system, Southern Brazil

2013 ◽  
Vol 11 (2) ◽  
pp. 217-246 ◽  
Author(s):  
Juliano Ferrer ◽  
Luiz R. Malabarba
Keyword(s):  
New Species ◽  
New Taxa ◽  
Lower Number ◽  
Restricted Range ◽  
Southern Brazil ◽  
Pectoral Fin ◽  
Fin Ray ◽  
Fin Rays ◽  
Pectoral Fin Rays ◽  
Uppermost Portion

The species of the genus Trichomycterus inhabiting the laguna dos Patos system are reviewed and five species are recognized. Trichomycterus tropeiro Ferrer & Malabarba has a restricted range and is endemic to the uppermost portion of the rio das Antas. Trichomycterus balios, n. sp., is distributed in the upper portion of the rio das Antas and rio Caí basins. Trichomycterus diatropoporos, n. sp., is endemic to the rio da Prata basin, a tributary of the rio das Antas. Trichomycterus poikilos, n. sp., is widely distributed in the upper portion of the rio Jacuí basin and tributaries of the rio Taquari-Antas. Trichomycterus brachykechenos, n. sp., is endemic to the upper portion of the rio dos Sinos. The new species are distinguishable from most congeners, except for T. davisi, T. mboycy, T. naipi, T. payaya, T. papilliferus, T. perkos, T. plumbeus, and T. tropeiro by the lower number of pectoral-fin rays (I+5-6) and by the first pectoral-fin ray not prolonged as a filament. Other characters distinguish the new taxa from these eight species. The distribution of the genus in the laguna dos Patos system is discussed and a taxonomic key is provided.

scholarly journals Pattern of fin rays along the antero-posterior axis based on their connection to distal radials

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Hiroki Hamada ◽  
Toshiaki Uemoto ◽  
Yoshitaka Tanaka ◽  
Yuki Honda ◽  
Keiichi Kitajima ◽  
...  
Keyword(s):  
Limb Development ◽  
Posterior Part ◽  
Specific Pattern ◽  
Pectoral Fin ◽  
Developmental Mechanism ◽  
Developmental Mechanisms ◽  
Middle Domain ◽  
Fin Ray ◽  
Fin Rays ◽  
Pectoral Fin Rays

Abstract Background Teleost paired fins are composed of two endoskeletal domains, proximal and distal radials, and an exoskeletal domain, the fin ray. The zebrafish pectoral fin displays elaborately patterned radials along the anteroposterior (AP) axis. Radials are considered homologous to tetrapod limb skeletons, and their patterning mechanisms in embryonic development are similar to those of limb development. Nevertheless, the pattern along the AP axis in fin rays has not been well described in the zebrafish pectoral fin, although several recent reports have revealed that fin ray development shares some cellular and genetic properties with fin/limb endoskeleton development. Thus, fin ray morphogenesis may involve developmental mechanisms for AP patterning in the fin/limb endoskeleton, and may have a specific pattern along the AP axis. Results We conducted detailed morphological observations on fin rays and their connection to distal radials by comparing intra- and inter-strain zebrafish specimens. Although the number of fin rays varied, pectoral fin rays could be categorized into three domains along the AP axis, according to the connection between the fin rays and distal radials; additionally, the number of fin rays varied in the posterior part of the three domains. This result was confirmed by observation of the morphogenesis process of fin rays and distal radials, which showed altered localization of distal radials in the middle domain. We also evaluated the expression pattern of lhx genes, which have AP patterning activity in limb development, in fin rays and during distal radial development and found these genes to be expressed during morphogenesis in both fin rays and distal radials. Conclusion The fin ray and its connection to the endoskeleton are patterned along the AP axis, and the pattern along the AP axis in the fin ray and the radial connection is constructed by the developmental mechanism related to AP patterning in the limb/fin bud. Our results indicate the possibility that the developmental mechanisms of fin rays and their connection are comparable to those of the distal element of the limb skeleton.

Two new goby species of the genus Eviota from the Ryukyu Islands, Japan (Teleostei: Gobiidae)

Zootaxa ◽  
2011 ◽  
Vol 2812 (1) ◽  
pp. 63 ◽  
Author(s):  
DAVID W. GREENFIELD ◽  
TOSHIYUKI SUZUKI
Keyword(s):  
The Body ◽  
Ryukyu Islands ◽  
Pore System ◽  
Pectoral Fin ◽  
Fin Ray ◽  
The Ryukyu Islands ◽  
Fin Rays ◽  
Group 2 ◽  
Pattern Group ◽  
Pectoral Fin Rays

Two new species of goby, Eviota ancora and Eviota rubriguttata, are described from the Ryukyu Islands, Japan. Eviota ancora belongs to the cephalic sensory-pore system pattern group 2, has a dorsal/anal fin-ray formula of 8/7, simple pectoral-fin rays, and a distinctive hook-shaped orange mark on the side of the head in life. Eviota rubriguttata belongs to the cephalic sensory-pore system pattern group 1, has a dorsal/anal fin-ray formula of 8/7, branched pectoral-fin rays, the body peppered with tiny black chromatophores, and round red spots on the dorsal and anal fins in life.

Two new species of Trimma (Pisces; Gobiidae) from Fiji, south-western Pacific Ocean

Zootaxa ◽  
2017 ◽  
Vol 4269 (4) ◽  
pp. 559 ◽  
Author(s):  
RICHARD WINTERBOTTOM
Keyword(s):  
New Species ◽  
Brown Spot ◽  
Colour Pattern ◽  
Pectoral Fin ◽  
Dorsal Fin ◽  
Fin Ray ◽  
Two New Species ◽  
Fin Rays ◽  
Pectoral Fin Rays ◽  
Pelvic Fin

Two new species of Trimma are described from Fiji. Trimma bathum n. sp. lacks scales on the cheeks, opercle and predorsal midline, has 18–19 unbranched pectoral fin rays, an unbranched 5th pelvic fin ray that is 40–56% the length of the 4th ray, 17–18 gill rakers on the outer surface of the first gill arch, a U-shaped interorbital and a narrow slit-like postorbital trench, a low, median fleshy ridge extending half-way towards the orbit from the origin of the first dorsal fin, and, when freshly collected, a pink head and body with most body scales having an orange-brown spot or short bar at their centres. The species is currently known only from off Suva Harbour, Viti Levu, Fiji. Trimma finistrinum n. sp. has a bony interorbital equal to the pupil diameter, a fully scaled nape of 12–14 scales, a second dorsal spine that may reach posteriorly to the middle of the second dorsal fin, the papillae in the longitudinal row immediately below the eye either single or with two papillae in a vertical row, unbranched pectoral fin rays, usually a branched fifth pelvic-fin ray that is about half length of the fourth ray, and a large diffuse dark blotch on the posterior part of the caudal peduncle. A colour pattern of a brownish body with most body scales having golden- to greenish-yellow (pale in preservative) centres is unique among species of the genus. The species is currently recorded only from off the north and east coasts of Viti Levu, Fiji.

A new species of the Genus Microbrotula (Teleostei: Bythitidae) from Cenderawasih Bay, New Guinea, Indonesia

Zootaxa ◽  
2012 ◽  
Vol 3583 (1) ◽  
pp. 71
Author(s):  
WERNER SCHWARZHANS ◽  
JØRGEN G. NIELSEN
Keyword(s):  
New Species ◽  
New Guinea ◽  
Pectoral Fin ◽  
Irian Jaya ◽  
Fin Ray ◽  
Fin Rays ◽  
A New Species ◽  
Pectoral Fin Rays

Following the recent revision of Microbrotula (Schwarzhans & Nielsen, 2011), an additional nine specimens of the vivi-parous genus Microbrotula (Teleostei: Bythitidae), all caught in the Cenderawasih Bay, Irian Jaya, New Guinea, Indone-sia, were made available to us. These specimens represent a new species described here as M. geraldalleni. It belongs tothe group of species with 6 caudal and 14 pectoral fin rays and is closest to M. greenfieldi, differing in the higher dorsaland anal fin ray counts (68–73 and 61–65 vs. 62–70 and 58–61, respectively), the presence of 3 posterior mandibular pores(vs. none), 2–3 preopercular pores (vs. none), a connected squamation over the head including cheek, opercle and occiput(vs. 3 separated scale patches) and with a unique scale-less triangular window just above the opercle. Microbrotula geraldalleni may be endemic to the Cenderawasih Bay.

Two new species of blue-eyed Trimma (Pisces; Gobiidae) from New Guinea

Zootaxa ◽  
2018 ◽  
Vol 4444 (4) ◽  
pp. 471
Author(s):  
RICHARD WINTERBOTTOM ◽  
MARK V. ERDMANN
Keyword(s):  
New Species ◽  
New Guinea ◽  
Depth Range ◽  
Pectoral Fin ◽  
Fin Ray ◽  
Two New Species ◽  
Fin Rays ◽  
Over The Top ◽  
Pectoral Fin Rays ◽  
Pelvic Fin

Two new species of Trimma are described from New Guinea, one at the southeastern end at Normanby Island (Milne Bay Province), the other from Cendrawasih Bay, West Papua, on the north-east coast. The dorsal surface of the eye of both species is blue in life, a characteristic not reported elsewhere in the genus. Although the two species look very similar in life, and both occupy similar mesophotic rubble habitats in the 50-70 m depth range, they are separated both genetically (7.7% pairwise genetic distance in COI) and morphologically. Trimma blematium has 16 pectoral fin rays, a branched 5th pelvic fin ray, and 7 papillae in row p, whereas T. meityae has 17–18 pectoral fin rays, an unbranched 5th pelvic fin ray, and 8 papillae in row p. In live specimens, the blue colour over the top of the eyes is much darker in T. blematium than in T. meityae. The type localities are separated by almost 2,000 km (straight-line distance). 

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