Exponential growth model of Nile tilapia (Oreochromis niloticus) strains considering heteroscedastic variance

Santos, Vander Bruno dos; Yoshihara, Eidi; Freitas, Rilke Tadeu Fonseca de; Neto, Rafael Vilhena Reis

doi:10.1016/j.aquaculture.2007.11.005

Cited by 30 publications

(28 citation statements)

References 4 publications

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“…Comparing the growth rates of the Thai and the same Commercial strain studied in this experiment, but cultivated in net cages and weighting up to 200 g, Santos et al (2008) found a significant difference between the strains, wherein Commercial (0.025) was superior to Thai (0.017). Osure & Phelps (2006) observed that the culture and the improvement of the local strain were more advantageous in relation to survival and initial growth, than the introduction of strain imported from other regions.…”

Section: Resultsmentioning

confidence: 98%

“…Evaluating the growth of two strains of tilapia of up to 160 days of age, Santos et al (2008) pointed the exponential model as an efficient tool when used for short evaluation periods, especially to estimate the parameters of estimated initial weight and specific growth rate. Santos et al (2007) used body weight, instead of the age, to evaluate the growth of the morphometric measures of the Commercial and Thai strains; the functions of Gompertz and von Bertalanffy were the best models obtained.…”

Section: Resultsmentioning

confidence: 99%

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Weight and morphometric growth of different strains of tilapia (Oreochromis sp)

et al. 2013

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-The objective of this study was to evaluate the morphometric growth and weight gain of strains of tilapia (Thai, Red, UFLA and Commercial) by nonlinear models. Initially, 500 male fingerlings of each strain, at 85 (Red and UFLA) and 86 (Thai and Commercial) days of age, were stocked separately in raceways with 56 m 3 . Twenty fish of each strain were randomly sampled, weighed and measured monthly. Five nonlinear models (Brody, von Bertalanffy, Gompertz, logistic and exponential) were tested, choosing one that best fit to the data. The variables studied were: weight, standard length (SL), head length (HL), height 1 (H1), height 2 (H2), height 3 (H3), first distance (D1), second distance (D2), first width (W1), second width (W2) and third width (W3). The exponential model had the best fit to weight and morphometric data, with the exception of W2, in which the best fitted model was von Bertalanffy. The convergence of the exponential model to data indicates that the cultivation period studied was not enough for the strains to reach maturity weight. The UFLA strain presented the lowest value for parameter "a" (initial weight estimate), 8.71 g, and the highest for parameter k (specific growth rate), 0.0127, when compared with other evaluated strains. However, the highest k of UFLA was not enough to overcome the final weight observed for the Commercial strain (603.1 g), which was higher than all other strains. Regarding the morphometric measurements, the UFLA strain also had the highest k for the variables SL, HL, HH, H1, H2, H3 and D2, and similar k to Commercial and Thai strains for the variables D1 and W3 respectively. The strains differ as to weight gain and morphometric growth.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Weight and morphometric growth of different strains of tilapia (Oreochromis sp)

et al. 2013

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show abstract

“…Santos et al (2008) utilizaram o modelo exponencial para comparação do crescimento de linhagens de tilápia do Nilo criadas em tanques-rede e obtiveram sucesso. O objetivo deste estudo foi avaliar a aplicabilidade do modelo de crescimento exponencial no estudo da eficiência da suplementação alimentar com mananoligossacarídeo e β-glucano para tilápias do Nilo criadas em tanques-rede.…”

Section: Introductionunclassified

Eficiência da suplementação alimentar em tilápias do nilo usando modelo exponencial de crescimento

García

Santos²,

Moraes

2011

Arch. zootec.

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“…Como ferramenta de análise, pode-se estudar o crescimento de animais por meio do ajuste de funções não-lineares, pois, dessa maneira, é possível sintetizar informações de todo o período de vida, ou seja, um conjunto de informações em série de peso por idade, em um pequeno conjunto de parâmetros interpretáveis biologicamente, facilitando, assim, o entendimento do fenômeno (Oliveira et al, 2000;García et al, 1995). Santos et al (2008) utilizaram o modelo exponencial para comparação do crescimento de linhagens de tilápia do Nilo criadas em tanques-rede e obtiveram sucesso. O objetivo deste estudo foi avaliar a aplicabilidade do modelo de crescimento exponencial no estudo da eficiência da suplementação alimentar com mananoligossacarídeo e β-glucano para tilápias do Nilo criadas em tanques-rede.…”

Section: Introductionunclassified

Eficiência da suplementação alimentar em tilápias do nilo usando modelo exponencial de crescimento

Garcia¹,

Santos²,

Moraes³

2010

ARCH ZOOTEC

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Objetivou-se avaliar a aplicabilidade do modelo de crescimento exponencial no estudo da eficiência da suplementação alimentar com mananoligossacarídeo e b-glucano para tilápias do Nilo criadas em tanques-rede. O experimento foi realizado em piscicultura de criação de tilápias em tanques-rede. Tilápias jovens, com peso inicial de 25,4 ± 2,04 g, foram distribuídas em 12 tanques-rede de 2 x 2 x 1,5 m, com volume útil de 6 m3 e densidade de 2500 peixes por tanque. Para estudo realizou-se a biometria individual de uma amostra aleatória de 5% dos peixes de cada unidade experimental. Os resultados permitem concluir que a adição de suplemento até o nível de 2000 mg/kg de ração não altera a taxa de crescimento. O modelo exponencial pode ser usado para comparar a eficiência de diferentes dietas.

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Exponential growth model of Nile tilapia (Oreochromis niloticus) strains considering heteroscedastic variance

Cited by 30 publications

References 4 publications

Weight and morphometric growth of different strains of tilapia (Oreochromis sp)

Weight and morphometric growth of different strains of tilapia (Oreochromis sp)

Eficiência da suplementação alimentar em tilápias do nilo usando modelo exponencial de crescimento

Eficiência da suplementação alimentar em tilápias do nilo usando modelo exponencial de crescimento

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