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Hydrobiology, Volume 2, Issue 3 (September 2023) – 6 articles

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14 pages, 3110 KiB

Open AccessTechnical Note

The Potential Use of Remote Underwater Video (RUV) to Evaluate Small-Bodied Fish Assemblages

by John B. Tweedie, Jaclyn M.H. Cockburn and Paul V. Villard

Hydrobiology 2023, 2(3), 507-520; https://doi.org/10.3390/hydrobiology2030034 - 20 Sep 2023

Viewed by 977

Abstract

Successful aquatic ecosystem conversation strategies depend on high-quality data from monitoring studies and improved habitat requirement knowledge. Remote Underwater Video (RUV) is a non-extractive alternative to capture-based techniques for studying and monitoring fish and is increasingly used in smaller channels. This study uses field observations made with waterproof Sony HDR-AS100V action cameras positioned in stream channels to determine species and population during various flow conditions across three sites within the Credit River Watershed, Ontario, Canada. Six fish species were identified, and individual fish lengths were estimated using the inverse square law to proportionally adjust size scales to fish positions relative to the camera. Successful identification and measurements were limited by turbidity, with camera placements in >6 NTU conditions (18% of all placements) resulting in at least one fish observed in the frame. With over 24 h of video recordings with 94 individual video clips, the optimal filming duration was determined to be 20–25 min. RUV surveys provide managers with useful monitoring data regarding fish present in an environment in a cost-effective and efficient manner. Additionally, as the method is largely non-invasive, RUV surveys are especially useful for studying fish behaviour, sensitive or endangered species, and working in difficult-to-access channels (e.g., shallow, faster flow). Full article

(This article belongs to the Special Issue Fish Welfare in Fisheries and Aquaculture)

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16 pages, 4507 KiB

Open AccessArticle

Inhibitory Effect of Aqueous Extracts from Egeria densa Planch. on Cyanobacteria Microcystis aeruginosa (Kützing) Lemmermann Growth

by Ashika Wijesinghe, Mudalige Don Hiranya Jayasanka Senavirathna and Takeshi Fujino

Hydrobiology 2023, 2(3), 491-506; https://doi.org/10.3390/hydrobiology2030033 - 15 Sep 2023

Cited by 1 | Viewed by 831

Abstract

This study aimed to investigate the allelopathic effect of live Egeria densa Planch. and its aqueous extracts in inhibiting the cyanobacterium Microcystis aeruginosa (Kützing) Lemmermann through a possible growth inhibition pathway. Under coexistence, the presence of live E. densa reduced the growth of M. aeruginosa by 48% compared to when M. aeruginosa was alone. Consequently, we prepared two separate aqueous extracts with distilled water: one from E. densa plants collected from monocultures, and the other from E. densa plants collected from co-cultivation with M. aeruginosa. At a concentration of 0.5 g/L, both extracts successfully suppressed the growth of M. aeruginosa throughout the 5-day exposure period. The extracts obtained from E. densa plants grown in a combined culture with M. aeruginosa showed significant growth-inhibiting capabilities compared to the extracts obtained from E. densa monoculture (p < 0.05). They showed 22% more growth inhibition compared to cultures exposed to monoculture extracts at day 5, indicating that the production of allelochemicals in E. densa was induced during co-existence with cyanobacteria. However, the higher concentrations (2 and 4 g/L) of both extracts did not effectively exhibit a successful inhibitive ability, possibly due to the presence of high nutrient concentrations, specifically PO₄³⁻, which may be potentially suppressing the activity of allelochemicals. Further studies are recommended in identifying the specific allelochemicals and exploring their practical implementation in the field. Full article

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16 pages, 2571 KiB

Open AccessArticle

Mechanical Removal of Minnows (Gila bicolor) to Improve Water Quality in a Hydropower Impoundment, Lemolo Lake, Oregon, USA

by Joseph Eilers, Kellie Vache and Richard Grost

Hydrobiology 2023, 2(3), 475-490; https://doi.org/10.3390/hydrobiology2030032 - 17 Aug 2023

Viewed by 803

Abstract

A project to mechanically remove an over-abundant population of cyprinids (Gila bicolor) was tested in a hydropower impoundment, Lemolo Lake (USA). The netting program removed 29.7 tons of fish (163 kg/ha) over a seven-year period that resulted in a reduction in the intensity and duration of cyanobacteria blooms. However, the suppression of the tui chub population apparently allowed for a residual population of kokanee (Oncorhynchus nerka) to proliferate. The resurgence of the kokanee, combined with the initiation of a rainbow trout stocking program, offset some of the gains in water quality achieved with the reduction of tui chub biomass. The dominant cyanobacterium present in Lemolo Lake transitioned to Gloeotrichia echinulata in 2013, but the majority of these colonies were apparently derived from an upstream lake. The changes in water quality from 2005–2013 were simulated for Lemolo Lake using the two-dimensional, hydrodynamic model, CE-QUAL-W2. The model reproduced many aspects of the water quality in Lemolo Lake and was used, in combination with a simple Bayesian model, to evaluate a number of potential scenarios for further improving water quality in the impoundment. Promoting a deeper drawdown of the hydroelectric impoundment during the winter to selectively increase entrainment of tui chub and kokanee, combined with continued netting targeted at tui chub, was judged to offer the greatest opportunity to manage the facility for water quality, fisheries and hydropower objectives. Full article

(This article belongs to the Special Issue Fish Welfare in Fisheries and Aquaculture)

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8 pages, 1021 KiB

Open AccessBrief Report

Effects of Predation Tags on Growth and Stress Response in Juvenile Rainbow Trout Oncorhynchus mykiss

by Emma K. Millsap, Nathan Huysman, Dylan A. Gravenhof, Mark J. Fincel and Michael E. Barnes

Hydrobiology 2023, 2(3), 467-474; https://doi.org/10.3390/hydrobiology2030031 - 20 Jul 2023

Viewed by 899

Abstract

Acid-sensitive predation tags have recently been introduced to fisheries management. The objective of this study was to ascertain the impact of these tags on juvenile rainbow trout Oncorhynchus mykiss physiology and growth after implantation. Twenty approximately 13 g rainbow trout were placed into each of five tanks, with ten surgically implanted with dummy acid-sensitive predation tags and ten control fish not subjected to surgical procedures. Glucose, hematocrit, tag-retention, survival, and growth metrics were collected for 30 days post-surgery. Four tagged fish died while no control fish died. Tag retention was 76%, with tags lost in weeks 2, 3, and 4. Control fish were significantly longer and gained significantly more weight at the end of the experiment. Hematocrit levels for the tagged fish dropped significantly over the course of the trial and were 30% lower than those of the untagged control fish at the end of 30 days. Glucose levels were highly variable for both treatments. The results of this study indicate the negative impacts of predation tagging on the physiology of juvenile rainbow trout. Results from predation field trials should be interpreted with caution because the tagged fish are likely at a competitive disadvantage compared to their untagged conspecifics. Full article

(This article belongs to the Special Issue Fish Welfare in Fisheries and Aquaculture)

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4 pages, 194 KiB

Open AccessEditorial

Ecology of Aquatic Invertebrates in Springs and Headwater Streams: Imperiled Habitats in a Changing World

by David E. Bowles and Weston H. Nowlin

Hydrobiology 2023, 2(3), 463-466; https://doi.org/10.3390/hydrobiology2030030 - 17 Jul 2023

Viewed by 744

Abstract

Headwater streams and springs and their resident biotas are vulnerable to a broad range of anthropogenic stressors [...] Full article

(This article belongs to the Special Issue Ecology of Aquatic Invertebrates in Springs and Headwater Streams: Imperiled Habitats in a Changing World)

17 pages, 12077 KiB

Open AccessArticle

Short-Term Responses of Aquatic Ecosystem and Macroinvertebrate Assemblages to Rehabilitation Actions in Martil River (North-Western Morocco)

by Achraf Guellaf, Jalal Kassout, Vladimiro Andrea Boselli, Nard Bennas, Majida El Alami, Sanae Errochdi and Kawtar Kettani

Hydrobiology 2023, 2(3), 446-462; https://doi.org/10.3390/hydrobiology2030029 - 03 Jul 2023

Cited by 1 | Viewed by 1117

Abstract

This study aimed to evaluate the effects of the Martil River rehabilitation project and recently constructed dam infrastructures to reduce flood risks and to promote local socio-economic development on the ecological integrity of the river. The assessment focused on changes in fluvial landforms over time and the evaluation of aquatic ecosystems based on six physicochemical parameters (temperature, pH, electrical conductivity, dissolved oxygen, biochemical oxygen demand, and chemical oxygen demand), morpho-hydrological variables (stream width, water depth, and current speed), habitat indices (QBR, IHF, and MQI), and macroinvertebrate assemblages of EPT, OCH, and Chironomidae (Diptera) at five stations from autumn 2015 to spring 2018 (prior to and during the rehabilitation actions). The results showed that the river rehabilitation project led to profound changes in Martil River’s ecosystem and water quality over time. Physicochemical and habitat measurements at the rehabilitated sites revealed a major change in macroinvertebrate communities due to changes in fluvial landforms in relation to flow-sediment regimes. As a result, some typical species of lentic habitats disappeared, while alien, opportunistic, and lotic species appeared. Full article

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