Occurrence of the Shortnose Sturgeon (Acipenser brevirostrum), an Endangered Species, in Montsweag Bay, Maine

1973 ◽  
Vol 30 (4) ◽  
pp. 563-564 ◽  
Author(s):  
Stephen M. Fried ◽  
James D. McCleave
Keyword(s):  
Endangered Species ◽  
Gulf Of Maine ◽  
River System ◽  
Shortnose Sturgeon ◽  
Acipenser Brevirostrum ◽  
Total Length

Thirty-one shortnose sturgeon (Acipenser brevirostrum) were caught in gillnets in Montsweag Bay in the Sheepscot River system during June and July of 1971 and 1972. Of nine fish preserved for study, six were longer than any previously documented and four exceeded the maximum total length previously postulated. These specimens represent the second population of this endangered species found in the Gulf of Maine.

scholarly journals Understanding the basis of shortnose sturgeon (Acipenser brevirostrum) partial migration in the Gulf of Maine

2018 ◽  
Vol 75 (3) ◽  
pp. 464-473 ◽  
Author(s):  
Matthew E. Altenritter ◽  
Gayle Barbin Zydlewski ◽  
Michael T. Kinnison ◽  
Joseph D. Zydlewski ◽  
Gail S. Wippelhauser
Keyword(s):  
Gulf Of Maine ◽  
Fork Length ◽  
Resource Limitation ◽  
Individual Characteristics ◽  
Shortnose Sturgeon ◽  
River Population ◽  
Acipenser Brevirostrum ◽  
Penobscot River ◽  
Major River ◽  
Kennebec River

Movement of shortnose sturgeon (Acipenser brevirostrum) among major river systems in the Gulf of Maine is common and has implications for the management of this endangered species. Directed movements of 61 telemetered individuals monitored between 2010 and 2013 were associated with the river of tagging and individual characteristics. While a small proportion of fish tagged in the Kennebec River moved to the Penobscot River (5%), a much higher proportion of fish tagged in the Penobscot River moved to the Kennebec River (66%), during probable spawning windows. This suggests that Penobscot River fish derive from a migratory contingent within a larger Kennebec River population. Despite this connectivity, fish captured in the Penobscot River were larger (∼100 mm fork length) and had higher condition factors (median Fulton’s K: 0.76) than those captured in the Kennebec River (median Fulton’s K: 0.61). Increased abundance and resource limitation in the Kennebec River may be constraining growth and promoting migration to the Penobscot River by individuals with sufficient initial size and condition. Migrants could experience an adaptive reproductive advantage relative to nonmigratory individuals.

Reconsidering residency: characterization and conservation implications of complex migratory patterns of shortnose sturgeon (Acispenser brevirostrum)

2013 ◽  
Vol 70 (1) ◽  
pp. 119-127 ◽  
Author(s):  
Phillip E. Dionne ◽  
Gayle B. Zydlewski ◽  
Michael T. Kinnison ◽  
Joseph Zydlewski ◽  
Gail S. Wippelhauser
Keyword(s):  
Gulf Of Maine ◽  
Conservation Strategies ◽  
Shortnose Sturgeon ◽  
Current Conservation ◽  
Acipenser Brevirostrum ◽  
Conservation Implications ◽  
Penobscot River ◽  
Migratory Patterns ◽  
Maine River ◽  
And Migration

Efforts to conserve endangered species usually involve attempts to define and manage threats at the appropriate scale of population processes. In some species that scale is localized; in others, dispersal and migration link demic units within larger metapopulations. Current conservation strategies for endangered shortnose sturgeon (Acipenser brevirostrum) assume the species is river resident, with little to no movement between rivers. However we have found that shortnose sturgeon travel more than 130 km through coastal waters between the largest rivers in Maine. Indeed, acoustic telemetry shows that shortnose sturgeon enter six out of the seven acoustically monitored rivers we have monitored, with over 70% of tagged individuals undertaking coastal migrations between river systems. Four migration patterns were identified for shortnose sturgeon inhabiting the Penobscot River, Maine: river resident (28%), spring coastal emigrant (24%), fall coastal emigrant (33%), and summer coastal emigrant (15%). No shortnose sturgeon classified as maturing female exhibited a resident pattern, indicating differential migration. Traditional river-specific assessment and management of shortnose sturgeon could be better characterized using a broader metapopulation scale, at least in the Gulf of Maine, that accounts for diverse migratory strategies and the importance of migratory corridors as critical habitat.

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

Overwintering habitat use of shortnose sturgeon (Acipenser brevirostrum): defining critical habitat using a novel underwater video survey and modeling approach

2007 ◽  
Vol 64 (9) ◽  
pp. 1248-1257 ◽  
Author(s):  
Xinhai Li ◽  
Matthew K Litvak ◽  
John E. Hughes Clarke
Keyword(s):  
Habitat Use ◽  
Linear Models ◽  
Video Camera ◽  
Sampling Procedure ◽  
Shortnose Sturgeon ◽  
Underwater Video ◽  
Camera System ◽  
Critical Habitat ◽  
Acipenser Brevirostrum ◽  
Modeling Approach

The overwintering habitat use of shortnose sturgeon (Acipenser brevirostrum) was investigated from January to March 2005 in the upper Kennebecasis River, New Brunswick, Canada, using a novel underwater video camera system and modeling approach. Following a random sampling procedure, 187 holes were drilled into the ice, and 234 sturgeon were counted and video-recorded. We found that sturgeon concentrated in a 2 ha area at the confluence of the Kennebecasis and Hammond rivers on a flat sandy substrate at a depth of 3.1–6.9 m. Generalized linear models were developed to describe the relationship of shortnose sturgeon density and habitat variables. The model indicated that the shortnose sturgeon had significant preference to deeper areas within this region. The total abundance of shortnose sturgeon in the area was estimated to be 4836 ± 69 (mean ± standard error) using the ordinary kriging method to interpolate sturgeon density at unsampled sites. This overwintering habitat of shortnose sturgeon can be defined as critical habitat following the identification policies of the Canadian Species at Risk Act (SARA).

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.

First documented occurrences of the shortnose sturgeon (Acipenser brevirostrum , Lesueur, 1818) in the Saco River, Maine, USA

2013 ◽  
Vol 29 (4) ◽  
pp. 709-712 ◽  
Author(s):  
C. E. Little ◽  
M. Kieffer ◽  
G. Wippelhauser ◽  
G. Zydlewski ◽  
M. Kinnison ◽  
...  
Keyword(s):  
Shortnose Sturgeon ◽  
Acipenser Brevirostrum

DNA Barcoding and Biometric Investigation on the Invasive Oreochromis niloticus (Linnaeus, 1758) from the River Yamuna of Uttar Pradesh

2020 ◽  
Author(s):  
Absar Alam ◽  
Narinder Kumar Chadha ◽  
Annam-Pavan Kumar ◽  
Sushant Kumar Chakraborty ◽  
Kripal Datt Joshi ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Dna Barcode ◽  
Taxonomic Status ◽  
River System ◽  
B Value ◽  
Coi Gene ◽  
Differential Growth ◽  
Male And Female ◽  
Total Length ◽  
River Yamuna

Oreochromis niloticus (Linnaeus, 1758), an invasive fish species is rapidly spreading in the Gangetic river system. The aim of the study was to identify and confirm its identity at species level by establishing a barcoding reference datasets in the river Yamuna and then to investigate its morphometric, meristic traits and length-weight relationship of O. niloticus from the Allahabad water of the river Yamuna by the examination of 341 fish specimens collected during October 2011 to September 2012. The taxonomic status of O. niloticus (Linnaeus, 1758), in the river Yamuna was assessed using DNA barcode marker COI gene sequences, have clearly identified the O. niloticus species with 100% similarity value with public database. The length-weight relationships were established as W = 0.029486L2.881638 and W = 0.058499L2.661735 for male and female. Differential growth in length-weight between male and female of O. niloticus were significant (p less than 0.05), with a greater slope (b) value for male (2.88) than female (2.66). The t statistics estimated for the regression coefficients (b) were significant at 5% level of significance (p less than 0.05), indicating an allometric growth pattern. The correlation was highest for the standard length and the total length (0.9878) and minimum for caudal peduncle length and total length (0.8022). Fin formula based on the meristic studies can be written as B3, D 15-19/11-15, P14, V 1/5, A 3/8-11 and C16-22.

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