scholarly journals Postrelease survival of green sturgeon (Acipenser medirostris) encountered as bycatch in the trawl fishery that targets California halibut (Paralichthys californicus), estimated by using pop-up satellite archival tags

2020 ◽  
Vol 118 (1) ◽  
pp. 63-73
Author(s):  
Phaedra Doukakis ◽  
Ethan A. Mora ◽  
Susan Wang ◽  
Paul Reilly ◽  
Russ Bellmer ◽  
...  
Keyword(s):  
Green Sturgeon ◽  
Acipenser Medirostris ◽  
Paralichthys Californicus ◽  
Trawl Fishery ◽  
California Halibut ◽  
Archival Tags

Anadromous Sturgeons: Habitats, Threats, and Management

2007 ◽  
Keyword(s):  
Depth Distribution ◽  
Data Sets ◽  
Depth Range ◽  
Green Sturgeon ◽  
Acipenser Medirostris ◽  
Management Measures ◽  
Archival Tags ◽  
And Behavior ◽  
Logbook Data ◽  
The U.S

<em>Abstract</em>.—Pop-off archival tags (PATs) and trawl logbook data were used to study the distribution, movement, and behavior of green sturgeon <em>Acipenser medirostris</em> off the U.S. and Canadian west coasts. Seven green sturgeon were tagged with PATs in the Rogue River, Oregon, during the autumn months of 2001 and 2002. All fish left the Rogue River and entered the ocean within 32 d of tagging. Six of seven tags popped off and transmitted data to satellites, as planned, 2.5 to 7.7 months after the fish left the Rogue River. One tag detached prematurely 5.7 months after tagging, but it drifted ashore in northern Oregon and was returned. All PAT-tagged sturgeon migrated north of the Rogue River after entering the ocean; pop-off locations ranged from the central Oregon coast to northwestern Vancouver Island, Canada. Estimated distances migrated through nearshore waters ranged from 221 to 968 km. Potential concentration sites off the Oregon and Washington coasts were identified using PAT and Oregon trawl logbook data sets. Green sturgeon exhibited a narrow and shallow depth distribution (typically < 100 m) over the continental shelf. This limited depth distribution makes green sturgeon vulnerable to trawl bycatch in the open ocean, which will increase if trawling within the narrow depth range increases. Although green sturgeon with PATs typically occupied depths of 40–70 m, they also occasionally made what appeared to be rapid vertical ascents to or near the surface. Green sturgeon tagged with PATs often were more active and occupied shallower depths at night than during the day. Green sturgeon are harvested by commercial, treaty, and sport fisheries. Because the population trends and abundance of green sturgeon are uncertain, and because green sturgeon from the main spawning rivers are probably mixed along the U.S. West Coast, conservative management measures should be implemented throughout the species’ range to limit fishing mortality and ensure effective conservation.

Migration of green sturgeon, Acipenser medirostris, in the Sacramento River

2008 ◽  
Vol 84 (3) ◽  
pp. 245-258 ◽  
Author(s):  
Joseph C. Heublein ◽  
John T. Kelly ◽  
Carlos E. Crocker ◽  
A. Peter Klimley ◽  
Steven T. Lindley
Keyword(s):  
Sacramento River ◽  
Green Sturgeon ◽  
Acipenser Medirostris

Biology, Management, and Protection of North American Sturgeon

2002 ◽  
Keyword(s):  
Growth Rate ◽  
Incubation Temperature ◽  
Larval Survival ◽  
Sampling Time ◽  
White Sturgeon ◽  
Green Sturgeon ◽  
Acipenser Medirostris ◽  
Relative Growth ◽  
Klamath River ◽  
Length Relationship

<em>Abstract.</em>—Gametes of green sturgeon <em>Acipenser medirostris</em> (caught in the Klamath River, California) and farm-reared white sturgeon <em>A. transmontanus</em> were obtained using hormonal induction of ovulation and spermiation. The offspring of one female in each species were reared in the laboratory, to compare their development and growth. Green and white sturgeon embryos had similar rates of development and hatched after 169 h and 176 h, respectively, at incubation temperature 15.7 ± 0.2°C. Embryos of both species exhibited similar holoblastic development and passed through 36 stages characteristic of acipenserids. Green sturgeon fertilization and hatching rates were 41.2% and 28.0%, compared with 95.4% and 82.1% for the white sturgeon. Larval survival to 45 d (metamorphosis) was 93.3% in green and 92.1% in white sturgeon. Newly hatched green sturgeon (length 13.7 ± 0.4 mm, mean ± SD) were larger and less pigmented, compared with white sturgeon. They had large ovoid yolk sacs and did not exhibit pelagic behavior that was observed in white sturgeon. The onset of exogenous feeding in green sturgeon occurred at age 10–15 d and length 24.0 ± 0.5 mm, and metamorphosis was completed at age 45 d and length 74.4 ± 5.9 mm (rearing temperature 18.5 ± 0.2°C). Weight and length of green sturgeon larvae and juveniles were considerably greater than in white sturgeon at each sampling time, but the relative growth rate and weight-length relationship were similar in both species. This suggests an effect of larger egg size and maternal yolk supply on the growth of green sturgeon. We conclude that green sturgeon differs from the white sturgeon in their reproductive strategy and, potentially, reproductive habitat.

Effect of Nutritional Status on the Osmoregulation of Green Sturgeon (Acipenser medirostris)

2015 ◽  
Vol 88 (1) ◽  
pp. 22-42 ◽  
Author(s):  
Liran Y. Haller ◽  
Silas S. O. Hung ◽  
Seunghyung Lee ◽  
James G. Fadel ◽  
Jun-Ho Lee ◽  
...  
Keyword(s):  
Nutritional Status ◽  
Green Sturgeon ◽  
Acipenser Medirostris
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