Yuri Simões

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Nilo Bazzoli

Pontificia Universidade Catolica de Minas Gerais

Alfredo Molina

P L Silva

Universidade de Trás-os-Montes e Alto Douro (UTAD)

Patrick Campbell

Southern Evangelical Seminary

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Pukyong National University, Korea

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Françoise Médale

Sadasivam Kaushik

Universidad de Las Palmas de Gran Canaria

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Robson Carvalho

University Of Sorocaba - UNISO

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Salinity and temperature variations reflecting on cellular PCNA, IGF-I 4 and II expressions, body growth and muscle cellularity of a freshwater 5 fish larvae 6 7 8

30 The present study assessed the influence of salinity and temperature on body growth and on mus... more 30 The present study assessed the influence of salinity and temperature on body growth and on muscle cel-31 lularity of Lophiosilurus alexaxdri vitelinic larvae. Slightly salted environments negatively influenced body 32 growth of freshwater fish larvae and we observed that those conditions notably act as an environmental 33 influencer on muscle growth and on local expression of hypertrophia and hypeplasia markers (IGFs and 34 PCNA). Furthermore, we could see that salinity tolerance for NaCl 4 g l À1 diminishes with increasing tem-35 perature, evidenced by variation in body and muscle growth, and by irregular morphology of the lateral 36 skeletal muscle of larvae. We saw that an increase of both PCNA and autocrine IGF-II are correlated to an 37 increase in fibre numbers and fibre diameter as the temperature increases and salinity diminishes. On the 38 other hand, autocrine IGF-I follows the opposite way to the other biological parameters assessed, increas-39 ing as salinity increases and temperature diminishes, showing that this protein did not participate in 40 muscle cellularity, but participating in molecular/cellular repair. Therefore, slightly salted environments 41 may provide adverse conditions that cause some obstacles to somatic growth of this species, suggesting 42 some osmotic expenditure with a salinity increment. 43

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Salinity and temperature variations reflecting on cellular PCNA, IGF-I 4 and II expressions, body growth and muscle cellularity of a freshwater 5 fish larvae 6 7 8

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Yuri Simões

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