Survival And Growth Of Pseudoplatystoma Corruscans (Pisces - Pimelodidae) Larvae: Effect Of Photoperiod

The survival and the growth of Pseudoplatystoma corruscans larvae exposed to four photoperiods: light: dark (LD) 0: 24, LD 10: 14, LD 14: 10, and LD 24: 0, in a brackish water (5%) culture were analyzed. Larvae were fed with Artemia sp. nauplii at a 500 nauplii/larvae/day ratio. Survival on day 5 was inversely related to the length of photoperiod. From days 5 to 10, intermediate photoperiods resulted in a better survival, although LD 0: 24 and LD 14: 10 resulted in similar survival on day 10. Larvae presented higher weight at intermediate photoperiods. The results suggested that photoperiod requirements shifted during early development of P. corruscans larvae.