Condition factor in nine species of fish of the Characidae family in the upper Paraná River floodplain, Brazil

Lizama, Maria de los Angeles Perez; Ambrósio, Ângela Maria

doi:10.1590/s1519-69842002000100014

Cited by 131 publications

(78 citation statements)

References 5 publications

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“…The 95% confidence interval of b ranged from 0.2211 to 1.1676. Lizama et al (2002) however reported a 95% CI of b value range between 2.329 and 3.919 of 12 freshwater fish species in the Kerian River basin and Pedu Lake.…”

Section: Discussionmentioning

confidence: 90%

Length-weight relationship and condition factor of Clarias gariepinus and Oreochromis niloticus of Wudil river, Kano, Nigeria

Getso¹,

Abdullahi²,

Yola³

2018

Agro-Sci.

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Section: Discussionmentioning

confidence: 90%

Length-weight relationship and condition factor of Clarias gariepinus and Oreochromis niloticus of Wudil river, Kano, Nigeria

Getso¹,

Abdullahi²,

Yola³

2018

Agro-Sci.

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“…Thus, this result suggested that during the interval of time between April and July the specimens invested in the tissue accumulation ('fattening period') to support the gonadal cycle, since the maturation occurred mainly in July. Seasonal variations in condition factors have frequently been related to the fishes gonadal cycle development (Le Cren, 1951;Hoyt, 1971;Barbieri and Verani, 1987;Goulart, 1994;Ikomi, 1996;Lizama and Ambrósio, 2002). It was suggested that the difference between Ka and K' would be positively related to the amount of stores allocated from the viscera and muscles to the gonads (Vazzoler, 1996).…”

Section: Discussionmentioning

confidence: 99%

Population structure, condition factor and reproductive period of Astyanax paranae (Eigenmann, 1914) (Osteichthyes: Characidae) in a small and old Brazilian Reservoir

Abelha

Goulart

2008

Braz. arch. biol. technol.

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“…The inspection of the seasonal variation of the condition factor is also being used as a complementary parameter aiming to describe natural cycles in reproduction and feeding ecology (Braga, 1986;Lizama & Ambrósio, 2000;Anene, 2005). However, the condition factor can suffer from any change related to the growth cycle of fish, a pattern already identified for perciforms (Bervian et al, 2006) and characiforms (Fontoura et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Seasonal changes in the gonadossomatic index, allometric condition factor and sex ratio of an auchenipterid catfish from eastern Amazonia

et al. 2011

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The aim of the present study was to evaluate the seasonal pattern of the gonadosomatic index (GSI), condition factor (K), and sex ratio in the catfish Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) as an approach to identify its reproductive period. A total of 589 A. longimanus specimens (251 males and 338 females) were captured in the rivers of the Caxiuanã National Forest, in the Brazilian state of Pará, between July, 2008 and July, 2009. Among the male specimens, 171 were classified as adults and 80 as juveniles, while there were 249 adults and 89 juvenile females. Using a sinusoidal equation, analysis of the GSI revealed a reproductive asynchrony between the genders, with males attaining their highest GSI values in January, while females peaked in March. For males, the sinusoidal regression for GSI values was significant only when used the complete data set (P=0.001), wears no trend was identified for bimonthly means (P=0.136). For females, by contrast, significant values were obtained for both the complete data set (P=0.012) and bimonthly GSI means (P=0.026). For the condition factor, the sinusoidal equation returned significant seasonal variation in both raw data (P=0.02) and with mean values (P=0.00) for males, but only with raw data for females (P=0.04), which appears to reflect variation in the energy budget between genders. With regard to the sex ratio, more reproductive females were captured than males in January and March, 2009, which suggests a pattern of segregation related to the reproductive process. These parameters are fundamental to the assessment, protection, and management of natural fish stocks, as well as providing guidelines for the development of conservation strategies.O objetivo deste estudo foi avaliar alterações sazonais no índice gonadossomático (IGS%), fator de condição (K) e proporção sexual, a fim de determinar o período de atividade reprodutiva do bagre Auchenipterichthys longimanus (Siluriformes: Auchenipteridae), a partir da análise de exemplares coletados em igarapés da Floresta Nacional de Caxiuanã, estado do Pará, Brasil. Através de coletas bimestrais entre julho de 2008 e julho de 2009, foram capturados 589 exemplares de A. longimanus, sendo 251 machos e 338 fêmeas. Dentre os machos, 171 exemplares foram classificados como adultos e 80 foram jovens, e dentre as fêmeas, 249 eram adultas e 89 jovens. Por meio do estabelecimento de uma equação senoidal, a análise do IGS% evidenciou uma assincronia reprodutiva entre os sexos, pois os machos obtiveram maiores valores de IGS% em janeiro e as fêmeas apresentaram seu pico em março. Para os valores de IGS% de machos, a equação senoide mostrou-se significante somente para os valores brutos (P=0,001), sendo não identificada uma tendência com os valores médios do IGS% (P=0,136). Para as fêmeas, os valores de significância da equação senoide para o IGS% foram obtidos tanto para os dados brutos (P=0,012) quanto para os dados médios (P=0,026). Para o Fator de Condição, a equação senoide demonstrou variação nos valores brut...

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Condition factor in nine species of fish of the Characidae family in the upper Paraná River floodplain, Brazil

Cited by 131 publications

References 5 publications

Length-weight relationship and condition factor of <i>Clarias gariepinus </i>and <i>Oreochromis niloticus </i>of Wudil river, Kano, Nigeria

Length-weight relationship and condition factor of <i>Clarias gariepinus </i>and <i>Oreochromis niloticus </i>of Wudil river, Kano, Nigeria

Population structure, condition factor and reproductive period of Astyanax paranae (Eigenmann, 1914) (Osteichthyes: Characidae) in a small and old Brazilian Reservoir

Seasonal changes in the gonadossomatic index, allometric condition factor and sex ratio of an auchenipterid catfish from eastern Amazonia

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