Feeding rates and prey preference in Octopus americanus paralarvae fed with different prey densities and types, Artemia, copepods, and zoeae

Connecting polarized light and water turbidity with feeding rates in Octopus americanus paralarvae

“…Furthermore, they also recommended prey density values well below those used in the literature to be offered to paralarvae up to 10 days of age during rearing (i.e., 80 copepods L À1 , 160 Artemia nauplii L À1 , and 80 zoeae L À1 ).). The prey density used in the present study (80 copepods L À1 ) was 10-fold higher than the observed FR (Table 1), suggesting that the prey density offered to paralarvae was adequate and in accordance with the results of Ortiz et al (2021).…”

“…The GP of paralarva, that is the daily net energy that could be applied for growth, increased with age and was sixfold higher in 15-day-old paralarva compared to hatchlings, indicating that growth is intensified after the end of the no net growth period, which comprises the transition from yolk absorption to successful prey capture (Vidal et al, 2002b). A better evaluation of The DEC was estimated by multiplying the individual energy content of Acartia lilljeborgi copepods (Laurence, 1976;Ortiz et al, 2021) by the mean observed feeding rate of paralarvae (see Table 1). The MR was estimated based on Parra et al (2000).…”

“…Wild calanoid copepods contain almost twice the polar lipid content of enriched Artemia (McEvoy, Naess, Bell, & Lie, 1998), which are readily digested and facilitates others' lipid digestion (Dhont & Stappen, 2003). It was also demonstrated that A. lilljeborgi copepods provide a higher DW biomass to paralarvae when compared to other commonly used preys, such as Artemia nauplii and zoeae (Ortiz et al, 2021).…”

“…It was recently shown that increasing prey density increases FRs of O. americanus paralarvae (Ortiz et al, 2021).…”

“…The DW of A. lilljeborgi was obtained from Ortiz, Gavioli, Bersano, and Vidal (2021) and is 10.9 ± 0.03 μg. A. lilljeborgi EPM is very similar to that of Acartia tonsa (Ara, 2001), in which every 1 g of DW contains 5,251 cal (Laurence, 1976).…”