Morphotype-dependent feeding responses in the guppyPoecilia reticulataPeters, 1859 (Class: Actinopterygii) fed zooplankton
Por:
Pelaez Rodriguez, Edgar, Sarma, S. S. S., Nandini, S.
Publicada:
1 feb 2021
Categoría:
Aquatic science
Resumen:
Many aquarium fish species have diverse morphotypes. Since different
morphotypes may have different preferences for various prey items,
offering a single prey species is inadequate for successful
aquaculture.Poecilia reticulata, a popular aquarium species, occurs in
different morphotypes. To test whether the four morphotypes (yellow tail
YT, red tail RT, metallic blue tail MBT and black tail BT) of this fish
prefer different items, we quantified somatic growth, feeding behaviour,
zooplankton selectivity and functional responses. Standard length (4.5
vs. 11.7 mm) and gape size (0.37 vs. 0.91 mm) of four morphotypes
increased linearly with larval age; YT and RT had 25% longer body
length and larger gape than the others. Prey encounters, attacks,
captures and ingestions increased with larval age. Lowest ingestion
rates were recorded for the RT morphotype on rotifers. At any given
larval age, prey consumption increased with increasing prey
availability. During the fourth and fifth weeks, larval YT and RT
consumed higher number (37 +/- 1 ind./predator/30 min) of cladocerans
compared with other two morphotypes (24 +/- 1 ind./predator/30 min).
Prey selectivity data showed that larvae of MBT and BT continued to
prefer rotifers up to 4 weeks, while those of YT and RT preferred
cladocerans during the 4th week.
Filiaciones:
Pelaez Rodriguez, Edgar:
Univ Nacl Autonoma Mexico, Posgrad Ciencias Mar & Limnol, Coyoacan, Mexico
Sarma, S. S. S.:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Campus Iztacala,Av Barrios 1, Tlalnepantla 54090, State Of Mexico, Mexico
Nandini, S.:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Campus Iztacala,Av Barrios 1, Tlalnepantla 54090, State Of Mexico, Mexico
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