Predation on larval suckers in the Williamson River Delta revealed by molecular genetic assays—A pilot study

Hereford, Danielle M.; Ostberg, Carl O.; Burdick, Summer M.

doi:10.3133/ofr20161094

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…Eight of 27 fathead minnows consumed the larvae. Similarly, in a laboratory study, single fathead minnows were observed feeding on Lost River sucker, Deltistes luxatus , and shortnose sucker, Chasmistes brevirostris , larvae (Hereford, Ostberg, & Burdick, ). Mobbing behavior of fathead minnows was observed by Dunsmoor ().…”

Section: Cannibalismmentioning

confidence: 87%

Fathead minnow reproduction: Implications for commercial culture

Stone¹,

Roy

Park³

2018

J World Aquaculture Soc

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The fathead minnow, Pimephales promelas, is widely used as a bait, forage, and research fish in the United States. A hardy and fecund fish, this species has many attributes that are excellent for culture. Unfortunately, despite the widespread use of fathead minnows in toxicity testing and thousands of resulting publications, relatively little aquaculture‐related research has been conducted in support of commercial production. On the surface, current commercial fathead minnow production practices appear much the same as those of a decade ago. However, producers continue to refine culture methods, balancing broodfish stocking rates, spawning substrate quantity, and feeding rates in an attempt to meet both losses to predators and market demand. This review examines relevant reproduction‐related studies in the fields of ecology, behavior, toxicology, and aquaculture with the goal of advancing fathead minnow culture. In fathead minnow production, relative to the culture of food fish species, reproduction is vital, more so than rapid growth or a low feed conversion ratio. Fish numbers may exceed 1 million fish/ha, while feeding rates are relatively low and in feeder fish production, growth is deliberately restrained in order to maintain fish within market sizes year‐round. Underappreciated factors identified as affecting reproduction and with implications for commercial culture include: (a) poor egg adhesion to commonly used spawning substrates, (b) egg and fry cannibalism at high fish densities, and (c) the relatively short breeding period of individual males. Results highlight the importance of selecting an appropriate broodfish stocking rate based on fish size, anticipated pond fertility, and feeding program. New methods to improve reproductive performance will likely increase costs and will need to be accompanied by thorough economic analyses.

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Section: Cannibalismmentioning

confidence: 87%

Fathead minnow reproduction: Implications for commercial culture

Stone¹,

Roy

Park³

2018

J World Aquaculture Soc

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“…Significant predation on threatened native fish larvae by alien fish species has been demonstrated in the USA through DNA assays (e.g. Ley et al 2014;Hereford et al 2016)…”

Section: Potential Mechanisms For Historical and Current Alien Trout ...mentioning

confidence: 99%

Alien fish ascendancy and native fish extinction: ecological history and observations on the Lower Goodradigbee River, Australia

Kaminskas

2022

Pacific Conserv. Biol.

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Context. The Murray-Darling Basin -Australia's largest river systemis heavily dominated by alien fish. Native fish species have suffered numerous localised extinctions and ~47% are listed on federal and/or state threatened species lists. Aims. This paper explores the hypothesis that alien fish and alien fish stockings can be the primary cause of decline and localised extinction of large-bodied native fish species, as opposed to habitat degradation and river regulation. The Lower Goodradigbee River, which is unregulated, in excellent instream health over the great majority of its course, and replete with high quality habitat, is utilised as a case study. Methods. I investigated the hypothesis by synthesising historical records with contemporary scientific research and recent field observations. The role of alien fish species, particularly alien trout species (Oncorhynchus mykiss and Salmo trutta) and constant stockings of them, were closely examined. Results. Data support the hypothesis that domination by alien trout species and their continual stocking have lead to historical declines and localised extinctions of large-bodied native fish species. Continued alien trout stockings, along with more recent invasions of alien carp (Cyprinus carpio) and alien redfin perch (Perca fluviatilis), are inhibiting native fish recovery. A suspected field sighting of the alien fish pathogen atypical Aeromonas salmonicida is reported, and the status of the declining native crayfish Murray cray (Euastacus armatus), and potential alien fish impacts upon them, are examined. Conclusions. The impacts of alien fish and alien fish stocking in Australia require major re-evaluation and dedicated research. Implications. It is strongly recommended that stocking of alien trout into the Lower Goodradigbee River for angling cease in order to conserve surviving native fish and Murray cray populations. Conservation stockings to effect a Murray cod (Maccullochella peelii) recovery in the Lower Goodradigbee River are warranted.

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Predation on larval suckers in the Williamson River Delta revealed by molecular genetic assays—A pilot study

Cited by 2 publications

References 15 publications

Fathead minnow reproduction: Implications for commercial culture

Fathead minnow reproduction: Implications for commercial culture

Alien fish ascendancy and native fish extinction: ecological history and observations on the Lower Goodradigbee River, Australia

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