Description of some larval shortnose sturgeon (Acipenser brevirostrum) from the Holyoke Pool, Connecticut River, Massachusetts, U.S.A., and the Saint John River, New Brunswick, Canada

1980 ◽  
Vol 58 (6) ◽  
pp. 1125-1128 ◽  
Author(s):  
Bruce D. Taubert ◽  
Michael J. Dadswell
Keyword(s):  
New Brunswick ◽  
Head Width ◽  
Entire Body ◽  
Shortnose Sturgeon ◽  
Connecticut River ◽  
Acipenser Brevirostrum ◽  
Pectoral Fins ◽  
Dorsal Fin ◽  
Mouth Width ◽  
Preanal Length

Shortnose sturgeon (Acipenser brevirostrum) protolarvae, ranging from 8.0 to 12.5 mm TL, had 20–23 postanal and 33–36 preanal myomeres and the preanal length was 66–70% of TL. The yolk sac was large, the pectoral fin buds were barely visible, and the entire body was covered with expanded melanophores. Mesolarvae of 13.0–14.7 mm TL had 22 postanal and 34 preanal myomeres, and preanal length was 61% of TL. The yoke sac was nearly gone, barbels, mouth, and pectoral fins were well developed and the anlage of the dorsal fin was visible. Mouth width of the 14.7 mm TL mesolarva was 71% of the head width and teeth were present.

Biology, Management, and Protection of North American Sturgeon

2002 ◽  
Keyword(s):  
Extinction Risk ◽  
High Rate ◽  
Future Research ◽  
Shortnose Sturgeon ◽  
Management Options ◽  
Connecticut River ◽  
Acipenser Brevirostrum ◽  
Survival And Reproduction ◽  
Very High ◽  
Existing Data

<em>Abstract.</em>—The shortnose sturgeon, <em>Acipenser brevirostrum</em>, is a long-lived species that grows slowly, matures at an advanced age, and spawns only intermittently. In the Connecticut River, there are two distinct subpopulations of shortnose sturgeon, which have been separated by the Holyoke Dam for 157 years. My research addressed the viability and persistence for these two separate populations and the effects of dispersal, variation in survival and reproduction, and catastrophes. My risk-based approach used a stage-based metapopulation model that I constructed in RAMAS<sup>®</sup> GIS incorporating the available data. Based on the existing data, this population model for the shortnose sturgeon metapopulation in the Connecticut River made several predictions. The observed stability of the two subpopulations was possible either: with reproduction in both upper and lower subpopulations and small to moderate rates of dispersal between them; or with no reproduction in the lower subpopulation, very high reproduction in the upper subpopulation and high rate of net downstream dispersal. My results provided estimates of extinction risk for the shortnose sturgeon metapopulation under various management options and highlighted three key areas for future research, demonstrating the value of a risk-based approach. This approach is particularly useful for management of long-lived aquatic species.

A redescription of Carcharhinus dussumieri and C. sealei, with resurrection of C. coatesi and C. tjutjot as valid species (Chondrichthyes: Carcharhinidae)

Zootaxa ◽  
2012 ◽  
Vol 3241 (1) ◽  
pp. 1 ◽  
Author(s):  
WILLIAM T. WHITE
Keyword(s):  
New Guinea ◽  
Morphological Data ◽  
Valid Species ◽  
Undescribed Species ◽  
Northern Australia ◽  
Tooth Morphology ◽  
Pectoral Fins ◽  
Dorsal Fin ◽  
Molecular Studies ◽  
Mouth Width

A taxonomic re-evaluation of the Carcharhinus sealei-dussumieri group using meristic and morphological data revealedthat this group consists of 5 species. Two species, Carcharhinus coatesi (Whitley, 1939) from northern Australia and prob-ably New Guinea and C. tjutjot (Bleeker, 1852) from Indonesian to Taiwan, are resurrected as valid species and togetherwith C. dussumieri and C. sealei are redescribed. Garrick’s lectotype designation of C. dussumieri and C. tjutjot areretained. A neotype for C. sealei, collected from the same locality as the holotype which was destroyed during World WarII, is designated. A fifth, possibly undescribed species (Carcharhinus sp.) is also noted from the Western Indian Oceanand its affinities briefly discussed. The four redescribed species are very similarly morphologically but can be distin-guished by a combination of meristic, morphological, dental and colour characters. The most important characters for dis-tinguishing these species are: vertebral counts, tooth counts, tooth morphology, shape of first dorsal and pectoral fins,second dorsal fin colouration, and mouth width. Two independent molecular studies have produced results which closely correlate with and support the findings of this study.

Modeling the timing of spawning and hatching of shortnose sturgeon, Acipenser brevirostrum, in the Saint John River, New Brunswick, Canada

2012 ◽  
Vol 69 (8) ◽  
pp. 1316-1328 ◽  
Author(s):  
Sima Usvyatsov ◽  
Jeffrey Picka ◽  
Ryan Scott Hardy ◽  
Travis Dawson Shepherd ◽  
James Watmough ◽  
...  
Keyword(s):  
New Brunswick ◽  
Gompertz Model ◽  
Shortnose Sturgeon ◽  
Catch Per Unit Effort ◽  
Larval Size ◽  
Acipenser Brevirostrum ◽  
Inverse Prediction ◽  
Saint John ◽  
In The Wild ◽  
Timing Of Spawning

Timing of spawning and hatching of shortnose sturgeon, Acipenser brevirostrum , in the Saint John River, New Brunswick, Canada, was estimated using inverse prediction. We examined egg incubation periods at 5, 9, and 13 °C to back-calculate spawning dates. No larvae hatched at 5 °C. At 9 and 13 °C, hatching began after 18 and 8 days post fertilization, respectively. Lengths of yolk-sac larvae reared in the laboratory at 13–21 °C were used to develop a temperature-mediated Gompertz growth model. The inverted Gompertz model, predicting larval age from larval size and water temperature, was applied to 671, 164, and 746 larvae captured in the wild in 2008, 2009, and 2010, respectively. Estimated hatching distributions peaked in late May, and mean spawning events were predicted to occur in late April – early May (9 °C scenario) and middle to late May (13 °C scenario). Larval ages at the two sampling transects, 4.5 km apart, were similar, while catch per unit effort was lower downstream, indicating mortality during dispersal. Inverse prediction of larval ages provides fast and cost-effective estimates of the timing of spawning, hatching, and larval migration in the wild.

A new species of Metahomaloptera (Teleostei: Balitoridae) from China

Zootaxa ◽  
2007 ◽  
Vol 1526 (1) ◽  
pp. 63-68
Author(s):  
JIAN YANG ◽  
XIAOYONG CHEN ◽  
JUNXING YANG
Keyword(s):  
New Species ◽  
Head Width ◽  
Pectoral Fin ◽  
Caudal Peduncle ◽  
Jinsha River ◽  
Dorsal Fin ◽  
Mouth Width ◽  
Eye Diameter ◽  
Peduncle Length ◽  
A New Species

A new species of Metahomaloptera, M. longicauda, is described from the lower Jinsha River, China. The new species is distinguished from other species of Metahomaloptera by the following combination of characters: pectoral fin with 11– 15 branched rays, tip of pectoral fin extending beyond origin of dorsal fin, pelvic fin with 10–12 branched rays, pelvicfin tip reaching or extending beyond anus, dorsal fin inserting before middle of body, tip of dorsal fin far from vertical line of caudal-fin base, head width 19.4–22.6% SL, pre-pectoral length 8.4–9.9% SL, pre-anal length 69.0–74.3% SL, caudal peduncle length 17.1–20.7% SL, eye diameter 14.6–16.6% HL, caudal peduncle depth 33.7–43.1% caudal peduncle length, mouth width 63.2–75.5% body width at pectoral-fin origin.

scholarly journals Development of Active Numerating Side-scan for a High-Density Overwintering Location for Endemic Shortnose Sturgeon (Acipenser brevirostrum) in the Saint John River, New Brunswick

Diversity ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 23 ◽  
Author(s):  
Samuel N. Andrews ◽  
Antóin M. O’Sullivan ◽  
Jani Helminen ◽  
Daniel F. Arluison ◽  
Kurt M. Samways ◽  
...  
Keyword(s):  
New Brunswick ◽  
Rapid Assessment ◽  
Fork Length ◽  
Mapping Method ◽  
Population Estimate ◽  
Shortnose Sturgeon ◽  
River Population ◽  
Side Scan Sonar ◽  
Acipenser Brevirostrum ◽  
Saint John

In 1979, the Shortnose Sturgeon (Acipenser brevirostrum) population of the Saint John River, New Brunswick, was estimated at 18,000 ± 5400 individuals. More recently, an estimate of 4836 ± 69 individuals in 2005, and between 3852 and 5222 individuals in 2009 and 2011, was made based on a single Shortnose Sturgeon winter aggregation in the Kennebecasis Bay of the Saint John River, a location thought to contain a large proportion of the population. These data, in combination with the Saint John River serving as the sole spawning location for Shortnose Sturgeon in Canada prompted a species designation of “Special Concern” in 2015 under Canada’s Species at Risk Act (SARA). A three-decade span of scientific observations amplified by the traditional knowledge and concerns of local indigenous groups have pointed to a declining population. However, the endemic Shortnose Sturgeon population of the Saint John River has not been comprehensively assessed in recent years. To help update the population estimate, we tested a rapid, low-cost side-scan sonar mapping method coupled with supervised image classification to enumerate individual Sturgeon in a previously undescribed critical winter location in the Saint John River. We then conducted an underwater video camera survey of the area, in which we did not identify any fish species other than Shortnose Sturgeon. These data were then synchronized with four years of continuous acoustic tracking of 18 Shortnose Sturgeon to produce a population estimate in each of the five identified winter habitats and the Saint John River as a whole. Using a side-scan sonar, we identified > 12,000 Shortnose Sturgeon in a single key winter location and estimated the full river population as > 20,000 individuals > ~40 cm fork length. We conclude that the combined sonar/image processing method presented herein provides an effective and rapid assessment of large fish such as Sturgeon when occurring in winter aggregation. Our results also indicate that the Shortnose Sturgeon population of the Saint John River could be similar to the last survey estimate conducted in the late 1970s, but more comprehensive and regular surveys are needed to more accurately assess the state of the population.

Transmission and development of Capillospirura pseudoargumentosa (Appy and Dadswell, 1978) (Nematoda: Cystidicolidae)

1983 ◽  
Vol 61 (4) ◽  
pp. 848-859 ◽  
Author(s):  
R. G. Appy ◽  
M. J. Dadswell
Keyword(s):  
New Brunswick ◽  
River Estuary ◽  
Shortnose Sturgeon ◽  
Fourth Stage ◽  
Developmental Morphology ◽  
Gammarus Tigrinus ◽  
Acipenser Brevirostrum ◽  
Infective Larvae ◽  
The Third ◽  
Third Stage

The cystidicolid nematode, Capillospirura pseudoargumentosa (Appy and Dadswell, 1978) (Habronematoidea) moulted twice and developed to the infective third stage in Gammarus tigrinus and G. fasciatus (Amphipoda) but not in isopods, decapods, mysids or other amphipods. At 10–14 °C development to the third stage in G. tigrinus took between 28 and 40 days and at 21–25 °C, it took between 10 and 15 days. Infective larvae fed to shortnose sturgeon, Acipenser brevirostrum, moulted from the third to the fourth stage within 15 days. Moulting third- and fourth-stage larvae were found in naturally infected sturgeon collected in the Saint John River estuary, New Brunswick. The developmental morphology of C. pseudoargumentosa is compared with that of other cystidicolid nematodes.

Evaluation of four methods of transmitter attachment on shortnose sturgeon, Acipenser brevirostrum

2002 ◽  
Vol 18 (4-6) ◽  
pp. 491-494 ◽  
Author(s):  
M. R. Collins ◽  
D. W. Cooke ◽  
T. I. J. Smith ◽  
W. C. Post ◽  
D. C. Russ ◽  
...  
Keyword(s):  
Shortnose Sturgeon ◽  
Acipenser Brevirostrum

Gaidropsarus mauli a new species of three-bearded rockling (Gadiformes, Gadidae) from the Lucky Strike hydrothermal vent field (Mid-Atlantic Ridge) and the Biscay Slope (Northeastern Atlantic)

Zootaxa ◽  
2018 ◽  
Vol 4459 (2) ◽  
pp. 301
Author(s):  
MANUEL BISCOITO ◽  
LUIZ SALDANHA
Keyword(s):  
New Species ◽  
Hydrothermal Vent ◽  
Valid Species ◽  
Lucky Strike ◽  
Pectoral Fins ◽  
Dorsal Fin ◽  
Fin Ray ◽  
Mid Atlantic Ridge ◽  
A New Species ◽  
Northeastern Atlantic

Gaidropsarus mauli, new species, is described from the Lucky Strike Hydrothermal vent site (Mid-Atlantic Ridge) and from the Bay of Biscay. It is distinguished from congeners by a combination of characters such as the number of vertebrae, the size of the first dorsal-fin ray, the profile of the head and the shape of the snout, in dorsal view, the size and the position of the eyes, the length of the pelvic fins, the shape of the pectoral fins, and the length of the lateral line. A comparison with the other 13 valid species of the genus is presented. 

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