Notes: Predicting the Lethality of Fluctuating Low Temperatures to Blue Tilapia

Starling, Scott M.; Bruckler, Rita M.; Strawn, R. Kirk; Neill, William H.

doi:10.1577/1548-8659(1995)124<0112:nptlof>2.3.co;2

Cited by 12 publications

(6 citation statements)

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“…However, as blue tilapia become lethargic at low temperatures (Ͻ20ЊC) their vulnerability to channel catfish predation increases (Chervinski and Stickney 1981;Starling et al 1995). In fact, channel catfish may stop consuming floating feed entirely when co-cultured blue tilapia become vulnerable to predation in late fall and winter (K. Farmer, Dumas, Arkansas, personal communication).…”

Section: Growth and Productionmentioning

confidence: 99%

“…In addition to their potential as food fish, these species have several qualities that make them good candidates for forage for channel catfish broodstock (Lewis et al 1965). They reproduce readily in a pond environment (Dunseth and Bayne 1978;Avault 1987), produce high numbers of small fish primarily on a plankton diet (Habel 1975), and are extremely vulnerable to predation when water temperature drops in the fall (Kutty and Sukumaran 1975;Chervinski and Stickney 1981;Starling et al 1995). Fall nutrition may be particularly important because much of the increase in the ovarian weight of channel catfish occurs in the fall and winter (Brauhn and Mc-Craren 1975).…”

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confidence: 99%

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Use of Tilapia as Supplemental Forage for Channel Catfish Broodstock

Torrans

Lowell

2001

North American Journal of Aquaculture

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The purpose of this study was to determine the effects of supplemental feeding with forage fish on the spawning success and egg quality of channel catfish Ictalurus punctatus. Channel catfish broodstock were maintained for 2 years on a diet of either commercial catfish feed with 32% protein or commercial catfish feed and live blue tilapia. Fish fed forage fish had significantly larger eggs and a higher gonadosomatic index prior to the second spawning season. They also spawned larger eggs, had a higher hatch rate, and produced more and larger fry than fish fed only commercial feed. During the second year of the study, growth rates and food conversion ratios were better over the winter months for channel catfish fed supplemental forage but worse over the summer months compared with fish fed only commercial feed. Over the two spawning seasons, broodstock fed forage fish produced an average of 9,221 sac fry/kg of females stocked in the spawning ponds. The addition of 10-15 kg/ha of blue tilapia to channel catfish broodstock ponds in the summer appears to be a practical method of increasing spawning success and fry production.

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Section: Growth and Productionmentioning

confidence: 99%

mentioning

confidence: 99%

Use of Tilapia as Supplemental Forage for Channel Catfish Broodstock

Torrans

Lowell

2001

North American Journal of Aquaculture

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“…Tilapia Tilapia Degree Day in Subtropics 133 production ponds typically are stocked with monosex male Nile tilapia (Oreochromis niloticus); often, these monosex fingerlings are produced by hormonal sex inversion using 17 α-methyltestosterone, although populations of male tilapia also are obtained increasingly by crossing genetically male tilapia (YY genotype) with normal females and less commonly by interspecific hybridization, e.g., Nile (O. niloticus) × blue (O. aureus) tilapia or by manual separation of sexes based on visual examination of the genital papilla (Beardmore et al 2001). Blue tilapia are grown less commonly than Nile tilapia but may be more appropriate for subtropical regions because of greater tolerance to lower water temperatures (Starling et al 1995;Rezk et al 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Blue tilapia cease spawning when average weekly water temperature is 19.4 • C (Aureli and Torrans 1988). Lower lethal temperature for blue tilapia is reported to range from 5 to 13 • C (Starling et al 1995).…”

Section: Introductionmentioning

confidence: 99%

Nile Tilapia and Blue Tilapia Fry Production in a Subtropical Climate Based on Degree Days

Green

Rizkalla

2015

Journal of Applied Aquaculture

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The relationship between production in subtropical earthen ponds of fry suitable for hormonal sex inversion and degree days was quantified for Nile tilapia ( Oreochromis niloticus; Egypt strain) and blue tilapia ( O. aureus). Degree days were calculated for each trial as the sum of mean daily water column temperature minus the reference temperature, 15 • C. No fry from either species were harvested at fewer than 124-126 degree days. Total fry production for each increased linearly as cumulative degree days increased from 129 to 281 degree days. Production of fry suitable for hormonal sex inversion was positively related to cumulative degree days only from 115 to 215 degree days. Tilapia fry too large for hormonal sex inversion were not observed until greater than 200 cumulative degree days and increased with increasing degree days thereafter. Optimal production in earthen ponds in a subtropical climate of Nile tilapia and blue tilapia fry suitable for hormonal sex inversion was obtained at 190-215 degree days.

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“…For example, with an initial temperature of 16 °C, a value of 60 cooling‐degree days could represent 15 days at 12 °C or 6 days at 6 °C, which would affect the fish differently. Although Starling et al. (1995) used a logistic model to predict duration of survival at different temperatures, similar to the approach used here, they examined rates of temperature decrease not common in surface waters, thereby limiting utility of their model for estimating survival in the wild.…”

Section: Introductionmentioning

confidence: 99%

Thermal tolerance experiments help establish survival probabilities for tilapia, a group of potentially invasive aquatic species

2009

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1. Estimating the probability of establishment is an important step toward managing ecological risk posed by natural or intentional introductions. Species introductions in certain geographic areas may pose less of a threat when environmental conditions are unlikely to promote long-term establishment. Species commonly referred to as 'tilapia' have become widespread in certain areas of the southeastern United States, yet concerns remain regarding their potential spread to other areas. 2. We created a model to predict the survival of tilapia in Georgia (U.S.A.) based on individual 'thermal experience'. Laboratory experiments were conducted to measure the duration of survival of two strains of tilapia, Oreochromis nilotica and O. nilotica · O. aureus hybrids, exposed to a variety of temperature regimes with three minimum temperatures and two rates of temperature decline. 3. We used Mayfield hierarchical logistic regression (MHLR) to describe the daily probability of survival as a function of the rate of temperature decline, average sustained temperature, tilapia strain and mass-length ratio. 4. Tilapia generally survived constant minimum temperatures over 12°C but survival rate was mediated by the rate of decline, mass-length ratio and strain. For every 1°C increase in minimum temperature, tilapia were 2.76 times more likely to survive. Fish exposed to rapid temperature decline were less likely to survive than those exposed to slowly decreasing temperature. More robust fish (higher mass-length ratio) were more likely to survive, and strain had a minimal effect despite being supported by the best MHLR model. 5. Our model can be used to estimate survival probability for tilapia under known surface water temperature regimes. Using MLHR in conjunction with experimental tolerance data may be useful for estimating the likelihood of establishment of potentially invasive species.

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Notes: Predicting the Lethality of Fluctuating Low Temperatures to Blue Tilapia

Cited by 12 publications

References 0 publications

Use of Tilapia as Supplemental Forage for Channel Catfish Broodstock

Use of Tilapia as Supplemental Forage for Channel Catfish Broodstock

Nile Tilapia and Blue Tilapia Fry Production in a Subtropical Climate Based on Degree Days

Thermal tolerance experiments help establish survival probabilities for tilapia, a group of potentially invasive aquatic species

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