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Seasonal changes of the pelagic fish assemblage in a temperate estuary Hagan, S.M.; Able, K.W. (2003). Seasonal changes of the pelagic fish assemblage in a temperate estuary. Est., Coast. and Shelf Sci. 56(1): 15-29. https://dx.doi.org/10.1016/s0272-7714(02)00116-6 In: Estuarine, Coastal and Shelf Science. Academic Press: London; New York. ISSN 0272-7714; e-ISSN 1096-0015, meer

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Beschikbaar in	Auteurs
VLIZ: Non-open access 400249 [ aanvragen ]

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Trefwoorden

Developmental stages > Juveniles Fish Temperate USA, New Jersey Brevoortia tyrannus (Latrobe, 1802) [WoRMS]; Clupea harengus Linnaeus, 1758 [WoRMS]; Menidia menidia (Linnaeus, 1766) [WoRMS] New Jersey [Marine Regions] Marien/Kust; Brak water

Author keywords

Pelagic; Fish; Estuarine; Seasonal; Abiotic

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Auteurs		Top
Hagan, S.M. Able, K.W.

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Abstract

The pelagic (i.e. fishes that spend most of their time swimming and feeding in the water column) fish assemblage was examined within a temperate estuary to determine the seasonal patterns of abundance, biomass, richness, and species composition. These measures were related to abiotic measures including temperature, salinity, water transparency, and depth. Pelagic fish were sampled weekly from August 1995 through December 1996 in Great Bay in New Jersey, USA, with a pop net (5 m diameter, 5 m length, 3 mm cod end). The most frequently occurring and abundant species included Clupea harengus (frequency of occurrence, 27.4%; abundance, 80.5% of total catch), Menidia menidia (frequency of occurrence, 83.5%; abundance, 10.6% of total catch), Anchoa mitchilli (frequency of occurrence, 66.5%; abundance, 6.0% of total catch), and Anchoa hepsetus (frequency of occurrence, 23.1%; abundance, 1.9% of total catch). There were strong seasonal trends in species richness, total abundance, and total biomass with peaks in spring, summer, and autumn, and very low values for these parameters in winter. In addition, there were five seasonal groupings within this pelagic fish assemblage that were primarily, but not exclusively, represented by young-of-the-year (age 0+). Winter (December–March) was represented by adult Gasterosteus aculeatus and age 1+ by M. menidia. Spring (April–early June) was overwhelmingly dominated by age 0+ C. harengus. Early summer (late June–early July) was relatively species rich and characterized by age 0+ of Brevoortia tyrannus, Pomatomus saltatrix, Alosa pseudoharengus, and age 1+ of A. mitchilli. Late summer (late July–August) remained relatively species rich and included mostly age 0+ of A. mitchilli, A. hepsetus, and M. menidia. Autumn (September–November) continued to have high catches of age 0+ of M. menidia and A. mitchilli. As expected for temperate estuaries, the best of the measured abiotic predictors of these groupings included temperature, salinity, and degree of change in temperature. However, timing of life history characteristics, such as location, and timing of reproduction and migration also influenced the seasonal occurrence of these pelagic species. The large abundance and biomass of a relatively few species, as observed in this study, are typical of estuaries, although this is one of the few studies that have focused solely on the pelagic component of estuarine fish assemblages.

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