Foods of Age-0 Rio Grande Silvery Minnows (Hybognathus amarus) Reared in Hatchery Ponds

Watson, Jacqueline M.; Sykes, Catherine; Bonner, Timothy H.

doi:10.1894/gg-33.1

Cited by 7 publications

(8 citation statements)

References 8 publications

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“…This phototrophic band of periphtyon develops within 2 days of inundation and includes algae, diatoms, and small insects (Valdez, Beck, Medley, Schmidt‐Petersen, & Zeiler, ). Rich detritus, diatoms, algae, and invertebrates are important food sources for larval RGSM (Watson, Sykes, & Bonner, ), and the timing of their appearance in these floodplains is critical to larval survival. Larvae of RGSM assimilate their yolk sac at 5mm SL (Brandenburg, ), or about 3–7 dph, and they undergo a “critical period” when nutrition shifts from endogenous (yolk) to exogenous (diatoms, algae, zooplankton) sources.…”

Section: Discussionmentioning

confidence: 99%

Managed spring runoff to improve nursery floodplain habitat for endangered Rio Grande silvery minnow

Valdez

Haggerty²,

Richard

et al. 2019

Ecohydrology

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Water managers in New Mexico, USA, stored water in El Vado Reservoir and coordinated releases into the Chama River that augmented the runoff of the Rio Grande, resulting in a discharge >1,500 ft3/s (42.5 m3/s) for 35 days (May 17 to June 20, 2016) at Albuquerque. The managed runoff inundated over 400 ha of previously restored floodplains in the Middle Rio Grande, thereby providing spawning and nursery habitat for the endangered Rio Grande silvery minnow (Hybognathus amarus, RGSM). Spawning began April 9 at annual cumulative degree‐days of 717, during daily increases in discharge of 200–300 ft3/s (5.7–8.5 m3/s), and hatch dates were normally distributed over 53 days (April 11 to June 3). RGSM were 73% of larvae collected in six restored floodplain sites and found in shallow water (mean = 19.6 cm), low velocity (mean = 3.9 cm/s), near vegetative cover, and with 75% within 1 m of the water's edge. Declining proportions of early to late larval phases and a near absence of juveniles indicate a gradual departure from floodplains as postflexion mesolarvae and metalarvae 14–22 days post hatch (dph), with most leaving by the juvenile stage 40 dph. The annual RGSM October census showed an increase of 0.16 to 7.20 fish/100 m2 from 2015 to 2016, indicating that the managed runoff resulted in a positive population response. This study showed that constructing floodplains and managing river and reservoir operations to inundate those floodplains during and after RGSM spawning can provide nursery habitat that improves reproductive success and recruitment.

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Section: Discussionmentioning

confidence: 99%

Managed spring runoff to improve nursery floodplain habitat for endangered Rio Grande silvery minnow

Valdez

Haggerty²,

Richard

et al. 2019

Ecohydrology

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“…Collectively, these pathogenic effects add additional stress to an assemblage that is already affected by reduced water quantity, reduced water quality, and increased habitat fragmentation (Edwards and Contreras-Balderas 1991). Pathogenic effects and degraded habitat also could hinder efforts to reintroduce the Rio Grande silvery minnow Hybognathus amarus into the Big Bend National Park reach as copepods make up at least 10% of this fish's diet (Watson et al 2009). Furthermore, occurrence of the Asian fish tapeworm within the Rio Grande basin serves as a source of dispersal into nearby watersheds, potentially affecting a large pool of endemic fish species as well as recreational and commercial fisheries east of the Rio Grande in Texas.…”

Section: Discussionmentioning

confidence: 99%

Spatial and Temporal Distribution of the Asian Fish Tapeworm Bothriocephalus acheilognathi (Cestoda: Bothriocephalidea) in the Rio Grande (Río Bravo del Norte)

Bean

Bonner

2010

J Aqua Anim Hlth

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Recent collections of the Asian fish tapeworm Bothriocephalus acheilognathi in the Rio Grande have raised concern about the potential impacts on Rio Grande endemic and imperiled fishes. The objectives of this study were to determine distribution and definitive hosts of the Asian fish tapeworm within the Rio Grande drainage and to quantify occurrences and abundances. In total, 1,992 fish spanning 11 families were collected and examined for Asian fish tapeworms in the Rio Grande and the Pecos and Devils rivers. The parasite was collected from red shiners Cyprinella lutrensis, Tamaulipas shiners Notropis braytoni, sand shiners N. stramineus, river carpsuckers Carpiodes carpio, plains killifish Fundulus zebrinus, western mosquitofish Gambusia affinis, blue suckers Cycleptus elongatus, blacktail shiners Cyprinella venusta, proserpine shiners Cyprinella proserpina, and Manantial roundnose minnow Dionda argentosa, with the latter four species being new host records. Monthly collections of red shiners from Big Bend National Park exhibited prevalence levels above 15% in January-March and December and below 10% during April-June and October. With over 50% of the Rio Grande icthyofauna in Texas considered imperiled, the occurrence and pathological effects of the Asian fish tapeworm in combination with reduced water quantity and quality and increased habitat fragmentation are of concern for these taxa.

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“…Because benthic diatoms are a major component of the Rio Grande Silvery Minnow's diet (Cowley et al 2006;Shirey et al 2008;Watson et al 2009), it is important to manage algal blooms to enable sunlight to penetrate to the bottom (14-90 cm) to produce these desired food organisms. The total annual fertilizer added to the refugium during grow out has ranged from 3.2 L 11-37-0 (N-P-K)/ha to 44.6 L 11-37-0 (N-P-K)/ha and 858 kg alfalfa pellets/ha.…”

Section: Methodsmentioning

confidence: 99%

Raising Fish in a Purpose‐Built Conservation Aquaculture Facility Using Conservation Aquaculture Management

Tave¹,

Toya²,

Hutson³

2019

N American J Aquac

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The naturalized conservation aquaculture unit (refugium) at Los Lunas Silvery Minnow Refugium is the first purpose‐built, large‐scale conservation aquaculture mesocosm. The refugium is 0.2 ha in area, with 0.11 ha of interconnected water habitats, including a stream with sand bars, five ponds, shelves, marshes, attached bars, and overbank areas that can be inundated to create floodplains. The key components of conservation aquaculture management in the refugium are as follows: (1) no artificial feed is used, so that the fish develop the foraging strategies that will be needed in the wild and do not develop maladaptive behaviors associated with feeding; (2) the production of natural food organisms is based on indirect fertilization; (3) fish are subjected to managed predation, so that when stocked they are not behaviorally naïve; and (4) low stocking rates are used to mimic population densities in the wild. Results from 6 years of management and the lessons learned about facility design and conservation aquaculture management are discussed.

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Foods of Age-0 Rio Grande Silvery Minnows (Hybognathus amarus) Reared in Hatchery Ponds

Cited by 7 publications

References 8 publications

Managed spring runoff to improve nursery floodplain habitat for endangered Rio Grande silvery minnow

Managed spring runoff to improve nursery floodplain habitat for endangered Rio Grande silvery minnow

Spatial and Temporal Distribution of the Asian Fish Tapeworm Bothriocephalus acheilognathi (Cestoda: Bothriocephalidea) in the Rio Grande (Río Bravo del Norte)

Raising Fish in a Purpose‐Built Conservation Aquaculture Facility Using Conservation Aquaculture Management

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