Growth and reproduction of individually tagged Nile tilapia (Oreochromis niloticus) of different strains

Bolivar, Remedios B.; Ambekar, Jalindar D.; Bolivar, Hernando L.; Abella, Tereso A.

doi:10.1016/0044-8486(93)90034-v

Cited by 20 publications

(8 citation statements)

References 7 publications

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“…Tilapias fall into the latter category, being paired spawners with males often highly aggressive toward rivals in seeking out potential female mates. Bolivar et al (1993) showed that the distribution of female spawning status (categorized by early spawners, late spawners or virgin) within a population will influence the observed sex differences in body weight of O. niloticus at 210 d old. They also showed that least squares means of virgin female body weight can be equal or even greater than that of males at 210 d old.…”

Section: Possible Causes Of Sexual Size Dimorphism In Tilapiamentioning

confidence: 99%

Differences in sexual size dimorphism among farmed tilapia species and strains undergoing genetic improvement for body weight

Lind

Safari

Agyakwah

et al. 2015

Aquaculture Reports

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a b s t r a c t Many tilapia (Oreochromis spp.) farmers produce all-male populations because of the superior growth rate of males compared to females. To investigate differences in body weight at harvest of males and females among different tilapia strains, we analyzed data from 62,787 individuals collected from pedigreed breeding programs of O. niloticus (GIFT from Malaysia, the Abbassa line from Egypt, and the Akosombo line from Ghana), O. shiranus (the Bunda College-Domasi selection line), O. aureus (a selection line under development in Abbassa, Egypt, and a selection line from Israel) and a synthetic selection line of Red tilapia under development in Jitra, Malaysia, derived from stock from Malaysia, Taiwan and Thailand (O.sp.). Mixed models were separately fitted to the data from each selection line. There was a significant sex effect in all strains (P < 0.001). A significant (P < 0.001) sex by generation interaction was observed in all strains (scale effect, not reversal of rankings), except Red tilapia and O. shiranus. Least squares means showed a large range in the magnitude of body weight differences between sexes across the seven strains. The largest percentage difference between females and males was in O. aureus from Egypt (female body weight was 52.2% that of males at harvest), whereas the smallest difference was observed in the GIFT strain of O. niloticus (female body weight 84.7% that of males). Female to male body weight percentages for Red tilapia, O. shiranus, Egypt O. niloticus, Israeli O. aureus and Ghana O. niloticus were 81.3, 81.0, 69.1, 61.7 and 61.0, respectively. We discuss the results in relation to the potential productivity improvements due to superior growth rates of all-male culture compared to mixed-sex culture in tilapia populations differing in the female to male body weight ratio.

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Section: Possible Causes Of Sexual Size Dimorphism In Tilapiamentioning

confidence: 99%

Differences in sexual size dimorphism among farmed tilapia species and strains undergoing genetic improvement for body weight

Lind

Safari

Agyakwah

et al. 2015

Aquaculture Reports

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“…Peterson et al (2004) reported first maturity for female O. niloticus in Mississippi coastal catchments at 80 mm TL and L 50 at 113 mm TL. Further, the age of maturity is also variable and Duponchelle and Panfili (1998) report maturity at ages between 5.6 and 10 months, while under culture conditions the species has been shown to be capable of spawning at ages as young as 45 days (Bolivar et al, 1993). As O. niloticus is capable of multiple spawning within a year (McKaye et al, 1995;Peterson et al, 2004Peterson et al, , 2005 the large number of 450 mm TL juveniles sampled in 2/96, 4/96 and 1/97 (Figure 3) are likely to have been a result of spawning within the lake.…”

Section: Discussionmentioning

confidence: 99%

Rapid invasion of a subtropical lake fishery in central Mozambique by Nile tilapia, Oreochromis niloticus (Pisces: Cichlidae)

Weyl

2007

Aquatic Conservation

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) impoundment in the headwaters of the Buzi River system, which was invaded by Oreochromis niloticus in 1996 from a small (50.3 km 2 ) upstream reservoir.2. Experimental and artisanal catch data showed no O. niloticus until January 1996; after this O. niloticus was recorded in up to 83% of experimental seine net catches, 33% of experimental gill net catches, 43% of boat angling and 23% of shore angling catches, and in 48% of artisanal gill net catches.3. During the period January to March 1997, O. niloticus mean (upper, lower 95% confidence interval) yields in the artisanal fishery were 5.2 (3.6, 7.0) t month À1 . 4. The rapid invasion of this lake illustrates the significant invasion threat that small point-sources of this species pose to southern African freshwater systems.5. The study recommends: (1) that this species should not be used for aquaculture or fisheries enhancement in catchments that have not been invaded, and (2) that the eradication of potential point sources of O. niloticus in non-invaded catchment systems should be considered.

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“…Tilapia species vary in their reproductive potential and seed production rate (Lee 1979; Behrends 1983; Little 1989; Rana 1990). These differences are also evident among different strains of the same species (Smitherman, Khater, Cassell & Dunham 1988; Bolivar, Eknath, Bolivar & Abella 1993; Eguia 1996). Therefore, it would be more profitable for tilapia hatchery operators to use tilapia species or strain characterized as having high seed production rates.…”

Section: Introductionmentioning

confidence: 92%

Observations on the reproductive performance of three mouth-brooding tilapia species in low-salinity underground water

Ridha

2004

Aquac Research

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The reproductive performance and seed production of three mouth-brooding tilapia species, Oreochromis spilurus (Gˇnther), Oreochromis aureus (Steindachner) and Taiwanese red tilapia hybrid, were compared in low-salinity underground water (3^5 g L À 1 ) to select species with the highest reproductive rate. Two-year-old males and females having average body weights of 454 and 259 g, respectively, were stocked in 2-m 3 ¢breglass breeding tanks (two tanks per species) at 1:3 male to female sex ratio and at average density of three ¢sh m À 2 . Seeds (unhatched eggs; yolk-sac fry and the swim-up fry) were collected weekly for 112 days. The results showed O. spilurus to have signi¢cantly higher (Po0.05) mean spawning parameters expressed as total seed tank À1 (84 154), seed kg female À1 day À1 (284), seed m À 2 day À1 (190.3) and seed female À1 day À1 (76.3), than O. aureus and red tilapia. Monthly seed production in O. spilurus and red tilapia gradually increased from May, peaked in July and declined in August, while in O. aureus, it continued to decrease from May to August. In this study, the observed production levels of seed in O. spilurus were among the highest levels reported for tilapia; therefore, O. spilurus could be selected as a potential candidate for mass seed production in commercial tilapia hatcheries.

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Growth and reproduction of individually tagged Nile tilapia (Oreochromis niloticus) of different strains

Cited by 20 publications

References 7 publications

Differences in sexual size dimorphism among farmed tilapia species and strains undergoing genetic improvement for body weight

Differences in sexual size dimorphism among farmed tilapia species and strains undergoing genetic improvement for body weight

Rapid invasion of a subtropical lake fishery in central Mozambique by Nile tilapia, Oreochromis niloticus (Pisces: Cichlidae)

Observations on the reproductive performance of three mouth-brooding tilapia species in low-salinity underground water

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