A Review of Dissolved Gas Supersaturation Literature

Weitkamp, Don E.; Katz, Max

doi:10.1577/1548-8659(1980)109<659:arodgs>2.0.co;2

Cited by 305 publications

(235 citation statements)

References 63 publications

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“…Hyperinflation of the swim bladder has been attributed to gas supersaturation (Weitkamp & Katz 1980;Cornacchia & Colt 1984), stress caused by such factors as inadequate water depth (Kolbeinshavin & Wallace 1985), and excessive air ingestion (Nash et al 1977), and may hinder normal swimming, or in extreme cases result in floating fish and mortality. Dissolved oxygen saturation levels in the juvenile tanks were generally c. 100%, but did occasionally reach up to 105% with ambient water fluctuations.…”

Section: Discussionmentioning

confidence: 99%

Preliminary observations on breeding and rearing the seahorseHippocampus abdominalis(Teleostei: Syngnathidae) in captivity

Woods¹

2000

New Zealand Journal of Marine and Freshwater Research

102

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A small-scale preliminary investigation into the breeding and rearing of the seahorse Hippocampus abdominalis Leeson, 1827 in New Zealand was conducted using 12 wildbroodstock. These broodstock were maintained in a hatchery for breeding and the breeding behaviours exhibited by these were observed and described. Over a period of 6 months a total of 12 broods of juveniles were produced. These were then raised on a diet consisting mainly of enriched Artemia for a period of 1 year. After this period juveniles had reached a mean ± 1 SE total length of 110.73 ±0.13 mm, mean ± 1 SE wet weight of 3.07 + 0.23 g, and were reproductively mature. The mean + 1 SE survival per brood after 1 year was 10.57 ± 3.49%.

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Section: Discussionmentioning

confidence: 99%

Preliminary observations on breeding and rearing the seahorseHippocampus abdominalis(Teleostei: Syngnathidae) in captivity

Woods¹

2000

New Zealand Journal of Marine and Freshwater Research

102

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“…In contrast, the flow regime in reaches downstream of RoR powerhouses is expected to be the most similar to the NFR, since water diverted for power generation is returned to rivers after passing through turbines (Poff and Hart 2002;Kibler and Tullos 2013;Senay et al 2016). Nonetheless, the return of water at the tailrace may have a hydraulic impact on benthic macroinvertebrate composition (Anderson et al 2015) or fish as a result of dissolved gas supersaturation (Weitkamp and Katz 1980). RoR hydropower operations are expected to cause the greatest changes to the NFR in bypassed reaches where a proportion of flow is removed for power production.…”

Section: Characteristics Of Flow Diversion For Ror Hydropower and Intmentioning

confidence: 99%

Run-of-River hydropower and salmonids: potential effects and perspective on future research

Gibeau

Connors

Palen

2017

Can. J. Fish. Aquat. Sci.

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Abstract:The spatial footprint of individual run-of-river (RoR) hydropower facilities is smaller than reservoir-storage hydroelectric projects and their impacts to aquatic ecosystems are often assumed to be negligible. However, these effects are poorly understood, especially for salmonids whose freshwater habitat often overlaps with RoR hydropower potential. Flow regulation for RoR hydropower is unique in how it influences the seasonality and magnitude of flow diversion and because low-head dams can be overtopped at high flows. Based on a review of the primary literature, we identified three pathways of effects by which RoR hydropower may influence salmonids: reduction of flow, presence of low-head dams impounding rivers, and anthropogenic flow fluctuations. We synthesized empirical evidence of effects of RoR hydropower on river ecosystems from 31 papers, of which only 10 explicitly considered salmonids. We identified key research gaps including impacts of extended low-flow periods, anthropogenic flow fluctuations, and cumulative effects of multiple RoR projects. Filling these gaps is necessary to help manage and conserve salmonid populations in the face of the growing global demand for small-scale hydropower.Résumé : L'empreinte spatiale individuelle des centrales hydroélectriques au fil de l'eau est moindre que celle des centrales hydroélectriques avec réservoirs de retenue et, en conséquence, leurs impacts sur les écosystèmes aquatiques sont souvent jugés négligeables. Par contre, leurs effets écologiques sont peu connus, particulièrement pour les salmonidés dont l'habitat en eau douce coïncide souvent avec le potentiel hydroélectrique des centrales au fil de l'eau. La régulation des eaux par les centrales au fil de l'eau se distingue par son influence sur la saisonnalité et l'ampleur de la déviation des eaux, et parce que les barrages de basse-chute peuvent être submergés lors des crues. À la lumière d'un examen des sources documentaires primaires, nous avons cerné trois voies principales par lesquelles la production d'électricité des centrales au fil de l'eau peut influencer les salmonidés, soit la réduction des débits, la présence de barrages de basse-chute sur les rivières et des fluctuations d'origine humaine des débits. Nous avons produit une synthèse des résultats empiriques de 31 études portant sur les effets de la production d'hydroélectricité des centrales au fil de l'eau sur les écosystèmes lentiques, dont seulement dix s'intéressaient explicitement aux salmonidés. Nous avons cerné d'importantes lacunes dans les connaissances actuelles, dont l'impact de périodes prolongées de faible débit, des fluctuations d'origine humaine des débits et des effets cumulatifs de plusieurs centrales au fil de l'eau. Il est nécessaire de combler ces lacunes pour soutenir la gestion et la conservation durables des populations de salmonidés dans un contexte de demande mondiale croissante pour la production d'hydroélectricité à petite échelle.

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“…At or above 130%, numerous signs of GBD were observed in resident fish just downstream of Ice Harbor Dam (Schrank et al, 1997). An entire wealth of information on the effects of TDG on fish can be found in papers by Weitkamp and Katz (1980) and Weitkamp (2008). The first cited paper covers the literatures until 1979 and the later cited paper reviewed the literatures from 1980 to 2007.…”

Section: Current Practices and Knowledgementioning

confidence: 99%