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Czerniawski, Robert; Domagała, Józef; Krepski, Tomasz; Pilecka-Rapacz, M.

doi:10.4194/1303-2712-v15_3_07

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…The waters of the Odra system are the crucial migratory road for salmonids that use the Drawa River (tributary to the Noteć that supplies the Warta River) for breeding [59]. Therefore, the parameters of the Odra River system directly impact the ecological status of the entire river basin.…”

Section: Ecological Disaster and Consequencesmentioning

confidence: 99%

Water Quality of the Odra (Oder) River before and during the Ecological Disaster in 2022: A Warning to Water Management

Sługocki

Czerniawski

2023

Sustainability

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Aquatic ecosystems are under pressure due to human activity. In the summer of 2022, the Odra River (Central Europe) suffered a massive death of fish and mollusks. This paper aims to show selected water quality parameters before and during the ecological disaster and find which parameters may have been crucial to the development of this disaster. We used the Kruskal–Wallis test and Spearman’s correlation to check the water parameters’ spatial and temporal diversification. In addition, non-metric multidimensional scaling was performed. The water quality parameters of the Odra system were analyzed in sections: middle Odra, lower Odra, transitional waters, and Szczecin Lagoon. Human activity has led to the formation of a system with unusual characteristics, disturbing the river’s natural continuum and related processes. The year 2022 in the middle Odra differed from the previous years in having a high water temperature (>24 °C), high ammonium concentrations (>4 mg/L), and relatively low nitrate concentrations (<6.5 mg/L). At the same time, salt pollution in the river was very high (maximum 1.4 g/L). In June and July 2022, we observed low chlorophyll a concentrations in the middle Odra (on average 2.3 µg/L and 4.4 µg/L, respectively), presumably due to salinity stress and high temperatures, suppressing freshwater phytoplankton taxa. This circumstance has created the appropriate conditions for developing euryhaline and thermophilic Prymnesium parvum. Because of decaying organisms, hypoxia occurred in the lower Odra (0.26 mg/L of dissolved oxygen in surface waters), and oxygen conditions worsened in the transitional waters (<4 mg/L). The zonal deaths of fish and mollusks result from multiple stressors induced by human activity. This disaster has proven that it is necessary to improve selected water quality parameters to reduce the risk of such disasters. The most urgent recommendations are to reduce the salt pollution of the upper section of the Odra, reduce nutrient inputs, and improve the condition of smaller rivers feeding the main course of the Odra.

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Section: Ecological Disaster and Consequencesmentioning

confidence: 99%

Water Quality of the Odra (Oder) River before and during the Ecological Disaster in 2022: A Warning to Water Management

Sługocki

Czerniawski

2023

Sustainability

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“…A series of studies on stocked salmonid fry, fed live food prior to release, have repeatedly shown that postrelease growth and survival rates are higher in individuals with live-food experience (Czerniawski et al 2010(Czerniawski et al , 2011(Czerniawski et al , 2015, but also that the type of prey used in training can influence the results (Czerniawski et al 2011). Follow-up laboratory studies suggest that effects are due to improved foraging per se (Ciszewski et al 2020).…”

Section: Social Transfermentioning

confidence: 99%

Reared to become wild-like: addressing behavioral and cognitive deficits in cultured aquatic animals destined for stocking into natural environments—a critical review

Näslund

2021

bms

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Hatchery-reared aquatic animals tend to perform worse in natural environments than wild conspecifics. This was pointed out over a century ago and while there are many possible causes, one persistent observation is that unnatural rearing environments cause behavioral expressions unsuitable for a life in the wild. Behavioral traits being adaptive in barren, food-rich, and predator-free hatchery tanks likely differ from those being adaptive in nature. More recently, suspicions of cognitive deficiencies due to sensory deprivation have also been raised. Over the last few decades, substantial research has been devoted to produce more wild-like phenotypes in animals reared for stocking. This research includes life-skills training programs, where animals learn to cope with important features of the natural environment (e.g., live food and predation risk), and environmental modifications aimed at stimulating the formation of adequate cognitive and behavioral traits (e.g., environmental enrichment and reduction of the number of individuals per tank). The main purpose of this paper is to provide a summary of the current state-of-knowledge of interventions aimed at ameliorating cognitive and behavioral deficiencies in aquatic animals reared for stocking. Furthermore, it aims to provide a foundation to assist in the development of future questions, hypotheses, and experiments to eventually improve the postrelease performance of these animals.

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Effect of Rearing Experience on the Survival, Growth, and Behavior of Hatchery‐Reared Largemouth Bass

Diana

Diffin

Einfalt

et al. 2018

N American J Fish Manag

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Largemouth Bass Micropterus salmoides are commonly stocked throughout their native range, but survival of stocked fish is variable and often low. Hatchery fish may have difficulty switching to natural forage; therefore, providing feeding experience with natural prey in the rearing environment could result in improved growth and survival of Largemouth Bass after stocking. We conducted pond experiments to evaluate differences in growth and survival of Largemouth Bass reared in raceways and fed pellets or in ponds and fed either Bluegill Lepomis macrochirus prey or Fathead Minnow Pimephales promelas prey. Largemouth Bass reared on one of these three diets were stocked into ponds containing Bluegill prey. After 2 months, pellet-reared Largemouth Bass were significantly smaller than fish reared either on Fathead Minnows or Bluegills, whereas fish reared on either Fathead Minnows or Bluegills were similar. Fathead Minnow-reared Largemouth Bass had lower survival than Bluegill-reared fish, but no other survival differences were observed. To determine possible mechanisms influencing differential growth and survival of juvenile Largemouth Bass, we also conducted laboratory experiments examining the influence of prior feeding experience (pellets, Bluegills, or Red Shiners Cyprinella lutrensis) on foraging behavior and prey capture success in pools. Largemouth Bass reared on live forage captured prey faster, ingested more prey, and had higher capture efficiencies than did fish reared on pellets. Combined, pond and laboratory experiments show prior acclimation to live prey may ultimately be beneficial to increasing growth of stocked hatchery Largemouth Bass and could result in increased recruitment. We recommend additional exploration of acclimation of Largemouth Bass fingerlings to natural prey, preferably Bluegills, prior to stocking to determine whether hatchery managers should consider alternative rearing techniques.

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Cited by 5 publications

References 22 publications

Water Quality of the Odra (Oder) River before and during the Ecological Disaster in 2022: A Warning to Water Management

Water Quality of the Odra (Oder) River before and during the Ecological Disaster in 2022: A Warning to Water Management

Reared to become wild-like: addressing behavioral and cognitive deficits in cultured aquatic animals destined for stocking into natural environments—a critical review

Effect of Rearing Experience on the Survival, Growth, and Behavior of Hatchery‐Reared Largemouth Bass

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