Effects of water temperature on growth and sex ratio of juvenile Nile tilapia Oreochromis niloticus (Linnaeus) reared in geothermal waters in southern Tunisia

Azaza, Mohamed Salah; Dhraief, Mohamed Naceur; Kraïem, M. M.

doi:10.1016/j.jtherbio.2007.05.007

Cited by 199 publications

(150 citation statements)

References 35 publications

Supporting

Mentioning

101

Contrasting

Unclassified

Order By: Relevance

“…Therefore, the metabolic rate of fish possibly rose from the first to the last daily meal, as the highest water temperature observed (around 32°C) did not reach a harmful level for Nile tilapia. Azaza et al (2008) observed growth impairment in Nile tilapia juveniles only when water temperature reached 34°C. As fish feed intake directly follows the metabolic rate (IMSLAND et al, 2006), it probably increased between 8h00 and 16h00 in the present work.…”

Section: Resultsmentioning

confidence: 81%

Water quality and Nile tilapia growth performance under different feeding schedules

Caldini

Rebouças

Cavalcante

et al. 2011

Acta Sci. Anim. Sci.

View full text Add to dashboard Cite

ABSTRACT. The present study investigated the effects of different feeding schedules on certain variables of water quality and growth performance of Nile tilapia juveniles. Fifteen 25-L aquaria were used to hold the experimental fish population for six weeks. Five fingerlings (1.86 ± 0.13 g) were stocked in each aquarium (200 fish m -3 ; n = 5). The diet provided to fish and the feeding rates adopted were the same for all fish. The daily ration was divided in four meals (8, 11, 13 and 16h). In the positive control group (25/25/25/25), the daily ration was equally divided in the four meals; in the negative control group (40/30/20/10), the daily ration was unevenly divided in a progressively decreasing fashion (40, 30, 20 and 10%) throughout the day; in the experimental group (10/20/30/40), the daily ration was unevenly divided in a progressively increasing fashion (10, 20, 30 and 40%) throughout the day. The feed conversion ratio results were better for 10/20/30/40 than for the other groups. The 10/20/30/40 feeding schedule probably best combined the dietary allowance for fish with the increase in water temperature during the day.Keywords: aquaculture, daily ration, feeding management. ; n = 5). A dieta fornecida aos peixes e as taxas de arraçoamento adotadas foram as mesmas para todos os peixes. A ração diária foi dividida em quatro refeições (8, 11, 13 e 16h). No controle-positivo (25/25/25/25), a ração diária foi igualmente dividida nas quatro refeições; no controle-negativo (40/30/20/10), a ração diária foi desigualmente dividida de modo progressivamente decrescente (40, 30, 20 e 10%) ao longo do dia; no grupo experimental (10/20/30/40), a ração diária foi desigualmente dividida de modo progressivamente crescente (10, 20, 30 e 40%) ao longo do dia. Os resultados do fator de conversão alimentar foram melhores para 10/20/30/40 que para os outros grupos. O programa alimentar 10/20/30/40 foi aquele que provavelmente melhor combinou a oferta de dieta aos peixes cultivados com o aumento na temperatura da água durante o dia. RESUMO. Qualidade de água e desempenho produtivo da tilápia doPalavras-chave: aquicultura, manejo alimentar, ração diária.

show abstract

Section: Resultsmentioning

confidence: 81%

Water quality and Nile tilapia growth performance under different feeding schedules

Caldini

Rebouças

Cavalcante

et al. 2011

Acta Sci. Anim. Sci.

View full text Add to dashboard Cite

show abstract

“…Both physical and chemical aspects of the aquatic environment must be suitable to the requirements of the cultured fish species. Based on the data presented herein, the key water quality parameters: temperature, dissolved oxygen, pH and conductivity measured during the study period were all within the optimum range for rearing tilapia (Boyd and Tucker, 1992;Xu et al, 2005;Azaza et al, 2008). The percentage dissolved oxygen level barely fell below 100%, with slight super-saturation occurring in both experimental ponds.…”

Section: Water Qualitymentioning

confidence: 71%

Comparative Growth Performance of Mono-sex and Mixed-sex Nile Tilapia (<i>Oreochromis niloticus</i> L.) in Pond Culture System at Sebeta, Ethiopian

Dagne¹

2013

ija

View full text Add to dashboard Cite

Comparative growth performance of hand-sexed male mono-sex and mixed-sex Nile tilapia (Oreochromis niloticus) was conducted in six earthen ponds (200 m 2 each) in semi-intensive culture system. Experimental ponds were stocked at a stocking density of 2 fish/m 2 . Fish were cultured for a period of 240 days and fed at a daily rate of 5% of fish body weight. The results of the experiment showed that male mono-sex tilapia showed significantly higher (P<0.05) growth rate (weight, length, DWG, SGR) than mixed-sex group. Generally, male mono-sex fishes reached a larger final individual size (176.20±18.01) g than mixed-sex ((108.20±15.4) g, P<0.05). This difference was more pronounced after the 6 th month during the culture period as the later started reproduction early in the production cycle. Analysis on the economic data indicated that both treatments showed positive net return for the culture periods of 6 months, 7 months and 8 months. However, there was a difference in attaining the optimum net return in culturing Oreochromis niloticus as male mono-sex and mixed-sex. The male mono-sex group attained its optimum net return after 6 months of culture periods, while the mixed-sex group attained after 8 months. Therefore, culturing for extra two months in the later case showed a 32% decline from the optimum net return. Hence growing male mono-sex Oreochromis niloticus for 6 months is profitable under Sebeta, Ethiopia condition.

show abstract

“…Os resultados obtidos com a tilápia do Nilo variedade Supreme demonstram haver um comportamento quadrático (P < 0,05) entre o maior número de indivíduos machos e o aumento da temperatura, com nível para melhor desempenho em temperatura de 32 e 34 o C, confirmando os resultados já obtidos por diversos autores em estudos prévios com tilápias do Nilo (BAROILLER et al, 1995;LIKONGWE et al, 1996;ABUCAY et al, 1999;JACOBS;MÉLARD, 2001;KARAYÜCEL et al, 2003;BORGES et al, 2005;BEZAULT et al, 2007;HÖRSTGEN-SCHWARK, 2007;AZAZA;DHRAÏEF;KRAÏEM, 2008;ROUGEOT et al, 2008; ANGIENDA; AKETCH; WAINDI, 2010; WESSELS; SAMAVATI; HÖRSTGEN-SCHWARK, 2011), bem como para outras espécies de tilápias (DESPREZ; MÉLARD, 1998;BARAS et al, 2000;WANG;TSAI, 2000;BARAS et al, 2002). Figura 3.…”

Section: Resultsunclassified

Inversão sexual de alevinos de tilápias do Nilo (Oreochromis niloticus) variedade Supreme, submetidos a diferentes temperaturas durante fase de diferenciação sexual

et al. 2013

View full text Add to dashboard Cite

ResumoEste experimento avaliou os efeitos da temperatura na inversão sexual, sobrevivência e presença de deformidades em larvas de tilapia submetidas aos seguintes tratamentos controle (28ºC + ração 60 mg kg -1 de 17 α-metiltestosterona), 28, 30, 32 e 34ºC. Os resultados demonstraram diferença estatística entre a proporção de machos, sendo que as temperaturas controle, 32 e 34ºC (98; 91; 96 %, respectivamente) apresentaram resultados superiores aos obtidos para os tratamentos 28 e 30ºC (71 e 82 %). A sobrevivência observada nos diferentes tratamentos foram 90,74; 90,49; 88,20; 85,43 e 82,16 para o controle, 28, 30, 32 e 34ºC, respectivamente, sendo que houve diferença estatística entre os tratamentos 32 e 34 o C, somente quando estes foram comparados com o controle. Na análise das radiografias não foi possível observar presença de alterações morfológicas nos peixes submetidos aos diferentes tratamentos. Com este experimento, concluiu-se que as temperaturas de 32 e 34ºC foram capazes de masculinizar larvas geneticamente fêmeas, e que não houve incremento na mortalidade e na presença de deformidades que possam ser atribuídas aos tratamentos. Essa técnica é uma alternativa para a utilização de hormônios esteroides. Palavras-chave: Inversão sexual, sobrevivência, alterações morfológicas, proporção sexual AbstractThis experiment evaluated the effects of temperature on sex inversion survival and presence of deformities in larvae of tilapia subjected to the following treatments control (28ºC + diet 60 mg kg-1 of 17 α-methyltestosterone), 28, 30, 32 and 34ºC. The results showed a statistical difference between the proportion of males, with temperatures control, 32 and 34ºC (98, 91, 96%, respectively) showed better results than those obtained for treatments 28 and 30ºC (71 and 82%). The survival observed in different treatments were 90.74, 90.49, 88.20, 85.43 and 82.16 for the control, 28, 30, 32 and 34ºC, respectively, and there was statistical difference between treatments 32 and 34 ºC, only when these were compared with the control. In the analysis of the radiographs was not possible to observe the presence

show abstract

Effects of water temperature on growth and sex ratio of juvenile Nile tilapia Oreochromis niloticus (Linnaeus) reared in geothermal waters in southern Tunisia

Cited by 199 publications

References 35 publications

Water quality and Nile tilapia growth performance under different feeding schedules

Water quality and Nile tilapia growth performance under different feeding schedules

Comparative Growth Performance of Mono-sex and Mixed-sex Nile Tilapia (<i>Oreochromis niloticus</i> L.) in Pond Culture System at Sebeta, Ethiopian

Inversão sexual de alevinos de tilápias do Nilo (Oreochromis niloticus) variedade Supreme, submetidos a diferentes temperaturas durante fase de diferenciação sexual

Contact Info

Product

Resources

About