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Development of a New Model of Feeding Strategy Analysis of Fish Incorporating Resource Availability and Use Data

A. K. Yousuf Haroon
Riverine Station, BFRI, Chandpur 3602, Bangladesh

Karin A. Pittman
Dept. of Fisheries and Marine Biology, University of Bergen, High Technology Center, N-5020 Bergen, Norway

Abstract/ Executive Summary:

A feeding strategy model is proposed using stomach content and resource availability data. Incorporation of feeding electivity index (E) instead of the prey-specific abundance signifies the importance of resource availability in prey selection as well as the predator's ability to specialize, generalize or avoid particular prey items at the individual and population level.

Keywords: Feeding strategy, Prey importance (electivity), Tilapia

Location: Riverine Station, Chandpur, BFRI

Start Date: 13-07-1995

End Date: 15-07-1995

Program Area: Animal Health and Management

Commodity: Plankton

Objectives:

To know the importance of resource availability in prey selection as well as the predator's ability to specialize, generalize or avoid particular prey item both at individual and population level.

Methodology:

The data used in this paper was part of a work carried out at the Riverine Station, Chandpur, of the Bangladesh Fisheries Research Institute during 13-15 July' 95 in a nursery pond using two size (small and large) categories of Oreochromis spp. [Oreochromis niloticus (L.) x 0. mossambicus (Peters) natural hybrid]. The fish and subsurface plankton were sampled every 3 h from the nursery pond for 48 h to analyze their gut contents, food consumption, feeding electivity and available food. Pond preparation and fish stocking The pond was a nursery type, about 1,620 m² in size (water area 990 m²), 1.85 m in maximum depth and was kept weed-free for easy netting. The pond was prepared in June 1995 by completely drying, liming (250.0 kg. ha^-1) and manuring once (cowdung 10.0 t. ha^-1, urea 16.0 kg. ha^-1 and triple super phosphate 32.0 kg. ha^-1). Two sizes of Oreochromis spp. juveniles, collected from the Riverine Station's other nursery ponds, were stocked at a density of 7.0 juveniles. m^-2 (3,465 individuals of each size). Before stocking in the pond, fishes were kept in a flow-through system for 48 h to completely empty their gut contents. The small fishes were 4.3-9.3 cm in total length (TL) and 1.6-15.5 gin weight and the large fishes were 9.5-13.5 cm in TL and 14.4-46.4g in weight. Prior to stocking in the pond the fish had been fed a supplemental feed composed of 40% rice bran, 40% wheat bran and 20% fish meal at 2-5% of body weight (bw), once daily but not during our experiment. Two days after stocking, 10 fishes of each size were sampled every 3 h for 48 h with a cast net (3x6 m, mesh 0.5 cm). In total, 320 fishes (160 of each size) were collected.

Source of Information: Bangladesh J. Fish. Res., 3(2): 201-208, 1999

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Incorporation of feeding electivity index (E) instead of the prey-specific abundance signifies the importance of resource availability in prey selection as well as the predator's ability to specialize, generalize or avoid particular prey items at the individual and population level.

Knowledge Management: Journal