EFFECTS OF DIFFERENT LIGHT SPECTRA ON THE GROWTH PERFORMANCE AND SURVIVAL OF LARGEMOUTH BASS (MICROPTERUS SALMOIDES) LARVAE IN RECIRCULATING AQUACULTURE SYSTEMS

摘要

The effects of light-emitting diode (LED) spectra on the survival rate and growth performance of largemouth bass in the nursery stage were explored in this study. By means of recirculating aquaculture systems, largemouth bass larvae (initial body length of 6.5 +/- 0.23 mm) were reared under four different light spectra: blue (half-peak bandwidth = 429 to 450 nm), green (half-peak bandwidth = 503 to 535 nm), white (320 < lambda < 950), and full spectrum. After the 16-day experiment, the results showed that the survival rate was highest for the larvae in the full spectrum group (33.5% +/- 3.5%) and lowest for the larvae in the blue light group (11.6% +/- 0.7%). The final body lengths of the larvae under different light spectra was as follows: the full spectrum group had the longest average body length (12.4 +/- 0.3 mm), followed by the white light group and the green light group, and the larvae in the blue light group had the shortest average body length (12.1 +/- 0.4 mm). The dorsal and anal fins of the larvae differentiated fastest in the full spectrum group, and the caudal fins differentiated fastest in the green light group. The maximal and minimal malformation rates of the larvae occurred under white light (26.7% +/- 0.2%) and full spectrum light (16.7% +/- 0.9%), respectively. The results demonstrated that a full spectrum light environment can improve the survival of largemouth bass larvae and promote their growth and development.