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A portable zooplankton pump system that can be operated by 1 person is descnbed. Comparison of the taxononlic composition of zooplankton samples taken with the pump and a boat-towed net in a tropical, mangrovedominated estuary on 2 dates revealed significant correlations in the rank order of abundance of the major taxa captured by the 2 methods. Comparisons of densities of zooplankton taken by the 2 methods indicated that there was no significant difference in the mean abundances of the 3 taxa (copepods, nauplii and zoea) that made up more than 78 % of the animals sampled on each date. However net samples yielded significantly greater numbers of chaetognaths, larvaceans and polychaete larvae, while pump san~ples held more gastropod and bivalve larvae. Several possible uses of the pump system are discussed. Sampling of zooplankton with pumps in the open sea has several advantages over towed nets including reliable measurements of the filtered volume, depth control, and control of the filtering process with the possible use of several mesh sizes (Miller & Judkins 1981). Consequently, large shipboard pumps have been designed and used for a variety of zooplankton studies (e.g. Aron 1958, Beers et al. 1967, Lenz 1972, Herman et al. 1984). For many coastal systems such as reefs and kelp beds, it is often extremely difficult or impossible to sample zooplankton using boat-towed nets. Because of this, several methods, including man-powered nets (Hobson & Chess 1976), light-traps (Sale et al. 1976, Tranter et al. 1981) and non-illuminated traps (e.g. Alldredge & King 1977, Porter & Porter 1977, Hobson & Chess 1979) and pumps have been used to sample zooplankton in these habitats. Efforts to subsample water from the intakes of cooling systems of power Contribution No. 323 from the Austrdan Institute of Marine Science O Inter-Research/Printed in F. R. Germany plants have led to the development of several pump samplers (e.g. Icanberry & hchardson 1973, Yocum et al. 1978). Smaller, more portable pumps have been used to sample lake and stream zooplankton (Waite & O'Grady 1980, Williams 1985), but these devices require the use of a boat or a fixed platform for the power supply. In this paper we describe a portable pumping system (EZY-ZOOP) that can be used by 1 person to take quantitative samples of zooplankton. The need for such a pump arose in the course of a study of the trophic interactions between fish and zooplankton in mangrove-dominated estuaries. We needed a sampler that would sample quantitatively the zooplankton present at high tide amongst the stems and prop roots of a mangrove habitat dominated by species of Rhizophora. Neither boats nor hand held nets could be used successfully in this environment. After giving a detailed description of the sampler we compare the catches taken by the pump and a standard plankton net. Description of EZY-ZOOP sampler. The unit consists of 2 PVC pontoons supporting a base board on which the sampling equipment is mounted (Fig. 1). The water is pumped by a conventional 12 V bilge pump (Rule Co. Ltd, l500 g h-') attached to the underside of the base board. Power for the bilge pump is supplied by a 12 V motor vehicle battery mounted in a removable watertight box, which is sunk through the centre of the base board to form a stabilizing keel for the apparatus. The pump is activated by a switch on top of the battery box, and water is pumped past a calibrated flow meter (General Oceanics Inc.) mounted on top of the receiving tank (Fig. 1). The flow meter is necessary since it is possible that pump output can vary with 98 Mar. Ecol. Prog. Ser. 32: 97-100, 1986

A compact, self-contained zooplankton pump for use in shallow coastal habitats: design and performance compared to net samples