Preferential planktonic feeding by Pachypterus atherinoides

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Preferential planktonic feeding by Pachypterus atherinoides

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Gogoi, B., Das, D.N., Saikia, S.K. (2020): Feeding ecology of Pachypterus atherinoides (Actinopterygii; Siluriformes; Schilbeidae): A small freshwater fish from floodplain wetlands of Northeast India. Croatian Journal of Fisheries, 78, 105-120. DOI: 10.2478/cjf-2020-0011.

https://ribarstvo.agr.hr/volumes.php?la ... ticle:1232
PDF: https://ribarstvo.agr.hr/articles/77457 ... IN__en.pdf
ABSTRACT
The feeding ecology of was investigated for two consecutive years (2013-2015) from floodplain wetlands in the Subansiri river basin of Assam, North East India. The analysis of its gut content revealed the presence of 62 genera of planktonic life forms along with other animal matters. The organization of the alimentary tract and maximum Relative Mean Length of Gut (0.511±0.029 mm) indicated its carnivorous food habit. The peak gastro-somatic index (GSI) in winter-spring seasons and summer-rainy seasons indicated alteration of its feeding intensity. Furthermore, higher diet breadth on resource use (Levins’ and Hurlbert’s) with zooplankton compared to phytoplankton and total plankton confirmed its zooplanktivore habit. The feeding strategy plots also suggested greater preference to zooplankton compared to phytoplankton. The organization of its gill rakers specified a secondary modification of gut towards either carnivory or specialized zooplanktivory. So, the fish may be a carni-omnivore with preference to zooplankton.
  • Keywords: Diet breadth, Feeding strategy, Pachypterus atherinoides, Plankton, India
Attachments
Fig 1. Photograph of Pachypterus atherinoides (Bloch 1974) showing 4 longitudinal stripes of black spots present on<br />flank. A black spot is also visible on the base of caudal fin. Four pairs of barbs are prominent
Fig 1. Photograph of Pachypterus atherinoides (Bloch 1974) showing 4 longitudinal stripes of black spots present on
flank. A black spot is also visible on the base of caudal fin. Four pairs of barbs are prominent
Fig 3. Abundance of food items in the gut of Pachypterus atherinoides. Percent composition of (a) phytoplankton,<br />zooplankton, other animal matter and detritus (b) different planktonic groups. Un.ID, Unidentified Detritus; OAM, Other<br />Animal Matters; Zoo, Zooplankton; Phyto, Phytoplankton
Fig 3. Abundance of food items in the gut of Pachypterus atherinoides. Percent composition of (a) phytoplankton,
zooplankton, other animal matter and detritus (b) different planktonic groups. Un.ID, Unidentified Detritus; OAM, Other
Animal Matters; Zoo, Zooplankton; Phyto, Phytoplankton
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