Biology and Culture of Sturgeon Acipenseriformes

Doroshov, Sergei I.

doi:10.4324/9780429303937-7

Cited by 6 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Acipenser medirostris is a native species of important conservation and management concern in California, USA, with its southern population (southern distinct population segment; sDPS) listed as threatened under the Endangered Species Act in 2006 (Israel & Kimley, ; Klimley et al ., ; National Marine Fisheries Service, ). Because A. medirostris are anadromous and have a complicated life history strategy (Allen & Cech, ; Doroshov, ), impacts on rearing environments likely have prolonged fitness implications. After hatching and the development of exogenous feeding [ca.…”

Section: Introductionmentioning

confidence: 99%

Assessment of multiple stressors on the growth of larval green sturgeon Acipenser medirostris: implications for recruitment of early life‐history stages

Poletto

Martin

Danner

et al. 2018

Journal of Fish Biology

View full text Add to dashboard Cite

Early developmental stages of fishes are particularly sensitive to changes in environmental variables that affect physiological processes such as metabolism and growth. Both temperature and food availability have significant effects on the growth and survival of larval and juvenile fishes. As climate change and anthropogenic disturbances influence sensitive rearing environments of fishes it is unlikely that they will experience changes in temperature or food availability in isolation. Therefore, it is critical that we determine the effects of each of these potential stressors on larval growth and development, as well as understand the additive, synergistic or antagonistic effects of both. We reared threatened green sturgeon Acipenser medirostris (initial age ca. 32 days post hatch) at four temperatures (11, 13, 16 and 19°C) and two food availability rates (100% and 40% of optimal) to assess the effects of these stressors and their interactions on larval growth. We compared the overall size (fork length, total length and mass), growth rates (cm day−1 and g day−1) and relative condition factor of these larval and juvenile fish at 3 week intervals for up to 12 weeks. Our results indicated that temperature and food availability both had significant effects on growth and condition and that there was a significant interaction between the two. Fish reared with limited food availability exhibited similar patterns in growth rates to those reared with elevated food rates, but the effects of temperature were greatly attenuated when fish were food‐limited. Also, the effects of temperature on condition were reversed when fish were reared with restricted food, such that fish reared at 19°C exhibited the highest relative condition when fed optimally, but the lowest relative condition when food was limited. These data are critical for the development of relevant bioenergetics models, which are needed to link the survival of larval sturgeons with historic environmental regimes, pinpoint temperature ranges for optimal survival and help target future restoration sites that will be important for the recovery of sturgeon populations.

show abstract

Section: Introductionmentioning

confidence: 99%

Assessment of multiple stressors on the growth of larval green sturgeon Acipenser medirostris: implications for recruitment of early life‐history stages

Poletto

Martin

Danner

et al. 2018

Journal of Fish Biology

View full text Add to dashboard Cite

show abstract

“…Green sturgeon are a long-lived species of important conservation and management concern in the state of California (NMFS 2006;Israel and Klimley Israel and Kimley 2008;Klimley et al 2015). They are fully anadromous (Doroshov 1985;Allen and Cech 2007), which underscores the importance of considering the early life history stages of this species when implementing management or mitigation projects. After emergence and the development of exogenous feeding (ca.…”

Section: Introductionmentioning

confidence: 99%

“…Quantifying the behavior of a wide range of juvenile sizes that may encounter water diversions throughout the Sacramento-San Joaquin watershed prior to full outmigration is important, as green sturgeon juveniles may respond differently to anthropogenic stressors as they age. For long-lived species such as sturgeon, which do not reach sexual maturity until between 12 and 18 years of age (Doroshov 1985), recruitment failure of early life history stages has been suggested as a reason for population declines (Hardy and Litvak 2004), and conservation of juveniles is therefore crucial for long-term population stability.…”

Section: Introductionmentioning

confidence: 99%

The effect of size on juvenile green sturgeon (Acipenser medirostris) behavior near water-diversion fish screens

Poletto

Cocherell

et al. 2017

Environ Biol Fish

View full text Add to dashboard Cite

Anthropogenic water management projects and facilities that alter the local and regional hydrology of riverine environments greatly influence the behavior, physiology, and survival of native fishes. To mitigate for losses of native fishes at these structures, many are outfitted with fish-exclusion screens to reduce entrainment. The effect of fish size and age on behavior near fish screens, however, is largely unknown. Therefore, we tested two size classes of juvenile green sturgeon (Acipenser medirostris; small, early juveniles: 9.2 ± 0.2 cm fork length [FL], 6.9 ± 0.3 g; intermediate juveniles: 18.8 ± 0.2 cm FL, 36.9 ± 0.8 g) near fish-exclusion screens in a laboratory swimming flume. Although size was a significant factor influencing the way in which fish contacted the screens (i.e., proportion of body contacts, p = 2.5×10 −9), it did not significantly influence the number of times fish contacted screens or the amount of time fish spent near screens. We also compared the performance of these two size classes to that of older and larger sturgeon that were tested previously (29.6 ± 0.2 cm FL, 147.1 ± 3.1 g), and documented a clear difference in the behavior of the fish that resulted in disparities in how the large fish contacted screens relative to smallor intermediate-sized juveniles (p = 0.005, 5.4 × 10 −4 , respectively). Our results further our understanding of how ontogeny affects fish behavior near anthropogenic devices, and are informative for managers seeking to identify the most susceptible size and age class of juvenile green sturgeon to water-diversion structures to potentially develop size-specific conservation strategies.

show abstract

“…Personal observation indicated that swarming behaviour was influenced by the light. The swarming is a typical behaviour of sturgeon pre‐larvae which appeared at the beginning of branchial respiration and at the stage of digestive system formation (Doroshov, ). During this stage, pre‐larvae are deposited at the bottom of tanks and are negatively phototactic and seek the cover in the bottom (Kynard & Richmond, ) especially before starting the exogenous feeding.…”

Section: Discussionmentioning

confidence: 99%

Growth, development and behaviour of Persian sturgeon Acipenser persicus larvae in different light regimes

et al. 2017

View full text Add to dashboard Cite

The effects of five different light regimes on growth performance and behaviour of Persian Sturgeon larvae were examined. Larvae were reared under five different photoperiods (24L, 12L:12D, 16L:8D, 8L:16L and 24D), from hatching (25.8 ± 8.1 mg; 12 ± 0.6 mm) to 28 days post‐hatch (dph). Except the last week, there was no significant difference in growth parameters among the experimental groups. Growth performance significantly improved in larvae reared under a continuous light regime. The highest final length (34.5 ± 1.7 mm) was measured in 24L and the lowest one (29.5 ± 0.4 mm) in the constant darkness. Relative to other experimental groups, the continuous darkness had a retarding impact on the yolk sac absorption and swarming behaviour. Among the whole body compositions, the lowest body moisture content was measured in the continuous light group. Persian Sturgeon pre‐larvae and larvae were not completely dependent on light regimes (in 1–21 days), whereas on the basis of measured parameters (total length, wet and dry weight and digestive fullness index) a continuous light regime played a decisive role on growth performance beyond 21 dph.

show abstract

Biology and Culture of Sturgeon Acipenseriformes

Cited by 6 publications

References 0 publications

Assessment of multiple stressors on the growth of larval green sturgeon Acipenser medirostris: implications for recruitment of early life‐history stages

Assessment of multiple stressors on the growth of larval green sturgeon Acipenser medirostris: implications for recruitment of early life‐history stages

The effect of size on juvenile green sturgeon (Acipenser medirostris) behavior near water-diversion fish screens

Growth, development and behaviour of Persian sturgeon Acipenser persicus larvae in different light regimes

Contact Info

Product

Resources

About