Ecology and biology of the fish assemblages

Abstract

In the chapter we summarize the current state of knowledge regarding the assemblages of fish species inhabiting the waters of Bahía Blanca Estuary. We begin by exploring the diversity of habitats and resources available for fish species, and then describe the different guilds of fish present in the estuary, based on historical data collections and current biological surveys. A list of the species of each guild and a brief description of the key biological features, such as habitat, distribution, reproduction and feeding habits of most relevant species is given. Spatial and temporal fluctuations in species composition within the estuary are described. We conclude this chapter with a section dedicated to the challenges that fish species are subject to in the Anthropocene and the temporal fluctuations in species composition within the estuary in the last 30 years. Chapter contents a test-box deals the artisanal fishery that operates within the estuary, and that has been subjected to various degrees of pressure from the industrial fleet operating in open waters outside the boundaries of the estuary. This chapter highlights the astounding abundance and diversity of fish living in this estuary, and the pressing need to ensure their conservation.