Migration and habitats of diadromous Danube River sturgeons in Romania: 1998-2000

Kynard, Boyd; Suciu, Radu; Horgan, Martin J.

doi:10.1046/j.1439-0426.2002.00404.x

Cited by 26 publications

(20 citation statements)

References 12 publications

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“…During this 4-year period, flows were lowest during 2001 (when no tagged fish migrated above rkm 45) and highest during 2003 (when all tagged fish migrated above rkm 45). Moser and Ross (1995) found that shortnose sturgeon moved downstream in response to handling, and Kynard et al (2002) reported that tagging stellate sturgeon, A. stellatus, in the Danube River during the spawning migration resulted in a drop-back rate of more than 50% (many returned to the Black Sea). Hall et al (1991) found that the spawning migration for three of ten shortnose sturgeon was interrupted due to capture and tagging.…”

Section: Upstream-spawning Migrationmentioning

confidence: 99%

Spawning Periodicity, Spawning Migration, and Size at Maturity of Green Sturgeon, Acipenser medirostris, in the Rogue River, Oregon

Erickson

Webb

2006

Environ Biol Fish

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The Rogue River, Oregon represents one of three important spawning systems for green sturgeon, Acipenser medirostris, in North America. In this paper we describe the spawning migration, spawning periodicity, and size at maturity for green sturgeon caught in the Rogue River during 2000-2004. Green sturgeon were caught by gill net or angling; 103 individuals were tagged with radio or sonic transmitters (externally or internally). Green sturgeon caught by gill net and angling ranged from 145 cm to 225 cm total length. Histological and visual examinations of gonad tissues indicated that most green sturgeon were spawning or post-spawning adults that entered the Rogue River to spawn. Ripe individuals were caught when water temperature was 10-18°C. Specimens carrying transmitters migrated 17-105 km up river; reaches consisting of likely spawning sites were identified based on sturgeon migratory behavior. Most green sturgeon remained in the Rogue River until late fall or early winter when flows increased, after which they returned to the ocean. Eight green sturgeon (males and females) returned to the Rogue River 2-4 years after leaving, entering the river during March, April, and May when water temperatures ranged from 9°C to 16°C. None of the 103-tagged individuals entered the Rogue River during successive years. There appear to be few known natural threats to adult green sturgeon in the Rogue River. However, our data suggest that a high percentage of adults that spawn in the Rogue River (particularly males) were susceptible to harvest by commercial, Tribal, and sport fisheries after leaving the system because they were not adequately protected by maximum size limits during the period of this study. The implications of maximum size limits (or lack of size limits) to green sturgeon are discussed, and recent actions taken by Oregon and Washington Fish and Wildlife Commissions to manage green sturgeon more conservatively are presented.

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Section: Upstream-spawning Migrationmentioning

confidence: 99%

Spawning Periodicity, Spawning Migration, and Size at Maturity of Green Sturgeon, Acipenser medirostris, in the Rogue River, Oregon

Erickson

Webb

2006

Environ Biol Fish

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“…The sandy river bottom dominating the lower part of the Danube River is unsuitable for spawning because of the sturgeon preference of rocky substrate with crevices (Kynard et al., 2002), however the presence of captured juveniles in that area indicates that they represent important sturgeon nursery habitats. Rocky areas rarely occur downstream, and the major rocky areas do not occur until rkm 258 or further upstream.…”

Section: Habitat Restorationmentioning

confidence: 99%

“…According to Vassilev (2003), the main beluga spawning sites were at depths of 9–22 m, on a gravel and coarse sandy substrate, with a strong, but ‘soft’ stream, situated between rkm 863 and 755. Sturgeons prefer a moderate water velocity for spawning (Kynard et al., 2002). In the Romanian part of the Danube River, according to Kynard et al.…”

Section: Habitat Restorationmentioning

confidence: 99%

Management approaches and aquaculture of sturgeons in the Lower Danube region countries

Smederevac-Lalić¹,

Jarić²,

Višnjić-Jeftić³

et al. 2011

Journal of Applied Ichthyology

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SummaryThis paper presents the status and trends in management of sturgeon species and the development of sturgeon aquaculture in the Lower Danube countries: Romania, Bulgaria, Serbia, Ukraine and Moldova. Sturgeon fishery moratoria and aquaculture development represent first steps in the Lower Danube countries to combat extirpation. Supportive stocking was used as a compensation for the impact of sturgeon fishery and dam construction, but these efforts unfortunately lacked adequate cooperation and coordination between and among region countries. Unsolved problems remain, such as the presence of illegal sturgeon fishery, water pollution, habitat destruction and fragmentation. Construction of fish passes and habitat restoration project developments are two key issues that have yet to be tackled in the Lower Danube region.

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“…During the 20th century, world demand for sturgeon meat and caviar has inflated the economic value of sturgeon fishing, with the value of beluga caviar estimated at the US $ 1000 per 100 grams (Suciu et al, 2008). This, together with the development of intense fishing pressure following a lack of fishing controls after the Romanian revolution in 1989 (Kynard et al, 2002) has caused, despite listing in year 2009 of all remaining Lower Danube river species, in Annex II of the Convention on International Trade in Species of Endangered Fauna and Flora (CITES), the sharp decline in recent documented catches of sturgeon. That is why is essential to increase the sturgeon production in aquaculture, in order to diminish the pressure on the wild stocks and to help the restoring of the wild population and to ensure their survival.…”

Section: Introductionmentioning

confidence: 99%

Morphometric Characteristics and Length-Weight Relationship of Russian Sturgeon Juveniles Fed with Different Ratio

Andrei¹,

Cristea²,

Dediu³

et al. 2017

BUASVMCN-ASB

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The aim of this paper was to analyze some morphometric characteristics and the correlation between them for Russian sturgeon juveniles (Acipenser gueldenstaedtii) reared in a recirculating aquaculture system fed at different fed with different ratio: 1% body weight (BW), 1.5% BW, 2% BW and ad libitum feeding (which was around 2.8% BW).Fish, with an average body mass around 248.194 ± 1.59 g. Following biometric measurements were made for each fish, including weight (W), total length (TL), standard length (SL), fork length (FL), maximum body depth (last depth of caudal peduncle, H); preanal distance (AD), predorsal distance (PD), length of head (C), preorbital distance (PO), length of pectoral fin (LPF), interorbital distance (ID), maximum width of head (MH), width of mouth (WM), width of the head at the level of the mouth (WHM). The obtained results showed significant differences between all morphometric measurements (p<0.05) for all the experimental variants, emphasizing that in the ad libitum feeding all morphometric measurements were significantly higher than in the other experimental variants. In order to highlight more eloquent these differences, were developed some linear regressions between the morphometric measurements and significant positive correlation (p<0.05) between dependent and independent variables were found.

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Migration and habitats of diadromous Danube River sturgeons in Romania: 1998-2000

Cited by 26 publications

References 12 publications

Spawning Periodicity, Spawning Migration, and Size at Maturity of Green Sturgeon, Acipenser medirostris, in the Rogue River, Oregon

Spawning Periodicity, Spawning Migration, and Size at Maturity of Green Sturgeon, Acipenser medirostris, in the Rogue River, Oregon

Management approaches and aquaculture of sturgeons in the Lower Danube region countries

Morphometric Characteristics and Length-Weight Relationship of Russian Sturgeon Juveniles Fed with Different Ratio

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