Changes in RNA, DNA, and protein contents in laboratory-reared yellowfin tuna, Thunnus albacares
2019
Tanaka, T. (Kindai University, Higashimuro, Wakayama (Japan). Aquaculture Research Institute, Uragami Station) | Morales, N. | Honryo, T. | Sawada, Y. | Margulies, D. | Scholey, V.P. | Wexler, J.B. | Stein, M.S. | Biswas, A.K. | Takii, K.
RNA, DNA, and protein contents were assessed to evaluate somatic growth in larval and juvenile yellowfin tuna (YFT), Thunnus albacares. The experimental fish were reared at the Achotines Laboratory of the Inter-American Tropical Tuna Commission in Los Santos Province, Republic of Panama. Sampling was carried out from 3 to 33 days after hatching (DAH). Standard length and dry body weight rapidly increased from 15 to 17 DAH (flexion-postflexion phase). The RNA-DNA ratio, which indirectly reflects the potential for protein synthesis in larval and juvenile fish, rapidly increased from 17 to 22 DAH (postflexion phase). This suggests that protein synthesis increased at some point between 17 and 22 DAH to induce organ and tissue differentiation. The protein-DNA ratio also rapidly increased from 17 to 22 DAH (postflexion phase), indicating an increase in cell volume. The protein-DNA ratio remained constant between 22 and 33 DAH (early juvenile phase). During this period, the RNA-DNA ratio also remained high, suggesting that the observed growth in the early juvenile phase was due to both increasing cell numbers and cell volume. Thus, active somatic growth was observed from the postflexion phase onwards, contributing to increasing cell numbers, cell volume, and protein synthesis.
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