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The views and opinions expressed or implied in this article are those of the author (or authors) and do not necessarily reflect the position of the National Marine Fisheries Service, NOAA. Abstract—The hypothesis that striped bass (Morone saxatilis), bluefish (Pomatomus saltatrix), weakfish (Cynoscion regalis), and species of forage fish would be associated closely with a salinity transition front was tested through sampling and tagging efforts. In a small New Jersey estuary, a station at a salinity front and another in a nearby channel were sampled weekly with gill nets. Abundance of bluefish was significantly greater at the front, and abundance of weakfish was significantly greater at the channel. Forage fish were collected at both stations, and the diets of bluefish and weakfish overlapped in all seasons. Ultrasonically tagged striped bass, weakfish, and bluefish were tracked concurrently, and their home ranges, or the 95% probability of their occurrences were computed. Home ranges of tagged striped bass occurred upriver and also near river kilometer 1. Home ranges of weakfish were located in the midriver channels, and those of bluefish were located midriver and upriver at river kilometers 5–12. Home ranges for these 3 species were not limited to the area of the salinity front, contrary to the initial hypothesis. Small tributaries of temperate-zone estuaries have vital but incompletely understood roles as sources of energy for growth of many sought-after commercial and recreational fish species. In flood-dominated estuaries, tidal movements and freshwater discharges create a salinity transition zone or front, where saline and riverine waters mix, with a salinity gradient forming both horizontally and vertically. Turbulent mixing in this zone may produce a turbidity maximum, where inorganic and organic particulates are suspended. The frontal boundary allows retention of nutrients, phytoplankton, microbes, and zooplankton (Grimes and Kingsford, 1996; Epifanio and Garvine, 2001). High freshwater discharges stabilize the duration and volume of such a nutrient-rich habitat (Morgan et al., 1997; Roman et al., 2001). It has been hypothesized that, with such mixing, food is concentrated for consumers, including larval and smallsize fish, which in turn attract larger predators (North and Houde, 2001; Martino and Houde, 2010). The Navesink River, a flood-dominated small tributary of the Hudson–Raritan Estuary in New Jersey that borders the Mid-Atlantic Bight, is used by predatory fish, forage fish, and invertebrate species (Shaheen et al., 2001; Stoner et al., 2001; Meise and Stehlik, 2003; Scharf et al., 2004; Manderson et al., 2006; Manderson et al.1). Previous hydrographic studies have delineated a convergence zone or salinity transition zone in the upper river (Chant and Stoner, 2001; Fugate and Chant, 2005). In this river system, 3 of the dominant pelagic predators are bluefish (Pomatomus saltatrix), striped bass

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Use of gill nets and telemetry in tracking movements and feeding of striped bass (Morone saxatilis), bluefish (Pomatomus saltatrix), and weakfish (Cynoscion regalis) at a salinity front in a small estuary