Temperature sensitivity of skeletal ontogeny in Oreochromis mossambicus

Campinho, Marco António; Moutou, K. A.; Power, Deborah

http://hdl.handle.net/10400.1/5427

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Authors

Campinho, Marco António

Moutou, K. A.

Power, Deborah

Abstract(s)

Sensitivity of skeletal ontogenesis to temperature was assessed in Mozambican tilapia Oreochromis mossambicus and culture temperature manipulations (22, 27 and 32 C) were used to establish if age or length gave the most suitable metric for standardization. Oreochromis mossambicus larval growth was composed of two growth stanzas: an initialpe riod of rapid growth, followed by a slower growth phase. Irrespective of culture temperature chondrogenesis occurred during the first rapid growth phase and ossification was initiated during the second slower growth phase. The sequence of events and rate at which ossification occurred was much more sensitive to temperature than chondrogenesis. Cumulative counts provide a useful developmental index for skeletal ontogenesis; overall, age (effective days-degrees) gave the best estimation of developmental status during chondrogenesis and the initiation of ossification, although standard length (as log10LS) was a better metric for completion of ossification. The timing of development of functionally important structures, such asMeckel’s cartilage, the branchial arches, the centra and the cleithrum important for breathing, feeding and swimming, was well conserved at all temperatures and may be a good index of teleost developmental stages.

Keywords

Bone Cartilage Heterochrony Oreochromis mossambicus Skeletal ontogeny Temperature

URI

http://hdl.handle.net/10400.1/5427

Citation

M. A. Campinho, K.A. Moutou e Deborah Power, "Temperature sensitivity of skeletal ontogeny in Oreochromis mossambicus" in Journal of Fish Biology (2004) 65, 1003–1025.