Diet variation and prey composition of exotic clown featherback Chitala ornata (Gray 1831) (osteoglossiformes : notopteridae) in Laguna De Bay Luzon Island Philippines

Corpuz Mark Nell Castillo, . Diet variation and prey composition of exotic clown featherback Chitala ornata (Gray 1831) (osteoglossiformes : notopteridae) in Laguna De Bay Luzon Island Philippines. pp. 252-264. ISSN 0116-6514

Diet composition and gut fullness of introduced clown featherback Chitala ornata (Gray 1831) were assessed from three sampling sites (west central and east regions) of Laguna de Bay (Philippines). A total of 203 specimens (10.18“98.5 cm) were collected through the fish trap seining and gillnet fishing from January to March 2014. Twelve stomachs were empty and excluded from the study. From the 191 stomachs eleven prey items were identified with Caridina sp. being the most important prey item by number (83.3 ) and frequency of occurrence (54.4 ). Teleosts prey particularly an endemic Leiopotherapon plumbeus (Kner 1864) was the most important food item by volume (41.6 ). Index of Preponderance and Index of Relative Importance recognised Caridina sp. and L. plumbeus as the two most important food items (in order of magnitude). Gut fullness was significantly different among geographical sites (P 0.01) with populations from the central region having the highest prey diversity and teleost prey consumption. An ontogenetic dietary shift was observed where small-sized C. ornata ( 45 cm) consumed mainly on crustaceans whilst teleosts were the main prey type for larger C. ornata ( 46 cm). The proportional weight of teleost-based diet and diversity of food items increased with C. ornata length.

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Abstract

Diet composition and gut fullness of introduced clown featherback Chitala ornata (Gray 1831) were assessed from three sampling sites (west central and east regions) of Laguna de Bay (Philippines). A total of 203 specimens (10.18“98.5 cm) were collected through the fish trap seining and gillnet fishing from January to March 2014. Twelve stomachs were empty and excluded from the study. From the 191 stomachs eleven prey items were identified with Caridina sp. being the most important prey item by number (83.3 ) and frequency of occurrence (54.4 ). Teleosts prey particularly an endemic Leiopotherapon plumbeus (Kner 1864) was the most important food item by volume (41.6 ). Index of Preponderance and Index of Relative Importance recognised Caridina sp. and L. plumbeus as the two most important food items (in order of magnitude). Gut fullness was significantly different among geographical sites (P 0.01) with populations from the central region having the highest prey diversity and teleost prey consumption. An ontogenetic dietary shift was observed where small-sized C. ornata ( 45 cm) consumed mainly on crustaceans whilst teleosts were the main prey type for larger C. ornata ( 46 cm). The proportional weight of teleost-based diet and diversity of food items increased with C. ornata length.

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Item Type:	Article
AGROVOC Term:	Osteoglossiformes
AGROVOC Term:	Notopteridae
AGROVOC Term:	Fish
AGROVOC Term:	Lake fisheries
AGROVOC Term:	Diet
AGROVOC Term:	Dietary components
AGROVOC Term:	Sampling
AGROVOC Term:	Laboratory diagnosis
AGROVOC Term:	Feeding habits
AGROVOC Term:	Carnivorous animals
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:29
URI:	http://webagris.upm.edu.my/id/eprint/24923

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