Conservation of Estuarine Fishes

Cowley, Paul D.; Tweedley, J.R.; Whitfield, Alan K.

doi:10.1002/9781119705345.ch10

Cited by 11 publications

(5 citation statements)

References 346 publications

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“…Biological productivity is fueled through the input of both terrestrial and marine nutrients, as well as through increased residence time due to salinity-driven density gradients and tidal forcing (Pérez-Ruzafa et al 2011). Estuaries support diverse assemblages of aquatic species along the salinity gradient, from obligate stenohaline species at the marine and freshwater fringes to oligohaline species that can utilize the entirety of the estuary (Whitfield et al 2022). The high productivity and location of estuaries at the interface between freshwater and marine environments has also resulted in the general colonization of estuaries by humans seeking the benefit of rich food sources and protected ports (Wilson 1988;Lotze et al 2006;Cabral et al 2022).…”

Section: Introductionmentioning

confidence: 99%

“…Estuaries are frequently monitored to track trends in the abundance and distribution of aquatic species of recreational, commercial, and cultural importance, many of which have declined because of extensive abiotic and biotic changes (Blaber et al 2022;Cowley et al 2022). Estuarine monitoring is undertaken by diverse state, federal, tribal, academic, and/or non-governmental organizations, all with potentially different objectives (Anderson 2005).…”

Section: Introductionmentioning

confidence: 99%

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A Spatiotemporal History of Key Pelagic Fish Species in the San Francisco Estuary, CA

Stompe

Moyle

Oken

et al. 2023

Estuaries and Coasts

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Estuaries across the globe have been subject to extensive abiotic and biotic changes and are often monitored to track trends in species abundance. The San Francisco Estuary has been deeply altered by anthropogenic factors, which is reflected in substantial declines in some native and introduced fishes. To track trends in fish abundance, a multitude of monitoring programs have conducted regular fish surveys, some dating back to the late 1950s. While these surveys are all designed to track population-scale changes in fish abundance, they are methodologically distinct, with different target species, varying spatial coverage and sampling frequency, and different gear types. To compensate for individual survey limitations, we modeled pelagic fish distributions with integrated data from many sampling programs. We fit binomial generalized linear mixed models with spatial and spatiotemporal random effects to map annual trends in the spatially explicit detection probabilities of striped bass, Delta smelt, longfin smelt, threadfin shad, and American shad for the years 1980 to 2017. Overall, detection probability has declined by approximately 50% for striped bass and is now near zero for the two smelt species, while threadfin shad and American shad have both experienced fluctuations with only slightly reduced detection probabilities by 2017. Detection probabilities decreased dramatically for these fishes in the Central and South Delta, especially after the year 2000. In contrast, Suisun Marsh and the North Delta acted as refuge habitats with reduced levels of decline or even increased detection probabilities for some species. Our modeling approach, using disparate datasets, demonstrates the simultaneous spatially driven decline of pelagic fish species in a highly altered estuary.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Spatiotemporal History of Key Pelagic Fish Species in the San Francisco Estuary, CA

Stompe

Moyle

Oken

et al. 2023

Estuaries and Coasts

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show abstract

“…This is particularly important for recreational fishers, as they act relatively autonomously, often with limited active management or surveillance, across large geographic areas compared to commercial fishers, who are often required to keep and submit logbooks and subjected to independent human or video observation [4]. As an example, approximately 4000 tonnes of fish are caught annually in South African estuaries, of which 60% is obtained illegally [22]. Management of recreational fisheries tends to rely heavily on encouraging voluntary compliance with regulations, which may be achieved through a number of mechanisms, including through targeted communication strategies [23,24].…”

Section: Introductionmentioning

confidence: 99%

Differences in Recreational Fishers’ Motivations for Utilising Two Estuarine Fisheries

Tweedley,

Obregón,

Beukes

et al. 2023

Fishes

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Effective fisheries management requires an understanding of human dimensions. This study elicited the salient motivations for recreational blue swimmer crab and black bream fishing in Western Australia and whether these views differed depending on the fishing location and/or the characteristics of the fisher. Crab fishers were strongly consumption-orientated and aimed to “catch big crabs” and “catch enough crabs to eat”. Furthermore, 91% consumed their catch, with only 2% practicing catch-and-release fishing. In contrast, 81% of black bream fishers did so for the sport/challenge, with the strongest motivation being to catch a bream considerably above legal size and with food only selected by 15% of respondents; most fishers released caught fish. The marked differences between the fisheries for the two species, which co-occur in the same estuaries, are likely driven by the accessible nature of the crab fishery, ease of catching crabs, the low cost of fishing equipment, and their taste. Fishing for black bream, however, requires more expensive equipment, patience, and a greater skill level. Fishers considered crabbing to be as important as other fishing and outdoor activities, whereas bream fishers considered bream fishing considerably more important, reflecting the trophy nature of this fishery.

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“…Estuaries are frequently monitored to track trends in the abundance and distribution of aquatic species of recreational, commercial, and cultural importance, many of which have declined because of extensive abiotic and biotic changes (Blaber et al 2022; Cowley et al 2022). Estuarine monitoring is often undertaken by state, federal, tribal, academic, and/or non-governmental organizations, all with potentially different objectives (Anderson 2005).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Spatiotemporal History of Key San Francisco Estuary Pelagic Fish Species

Stompe

Moyle

Oken

et al. 2022

Preprint

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Estuaries across the globe have been subject to extensive abiotic and biotic changes and are often monitored to track trends in species abundance. The San Francisco Estuary is a novel ecosystem that has been deeply altered by anthropogenic factors, resulting in fish declines over the past 100 years. To track these species declines, a patchwork of monitoring programs has operated regular fish surveys dating back to the late 1950s. While most of these surveys are designed to track population-scale changes in fish abundance, they are methodologically distinct, with different target species, varying spatial coverage and sample frequency, and differing gear types. To remediate for individual survey limitations, we modeled pelagic fish distributions with integrated data from many sampling programs. We fit binomial generalized linear mixed models with spatial and spatiotemporal random effects to map annual trends in the distribution of detection probabilities of striped bass, Delta smelt, longfin smelt, threadfin shad, and American shad for the years 1980 to 2017. Detection probabilities decreased dramatically for these fishes in the Central and South Delta, especially after the year 2000. In contrast, Suisun Marsh, one of the largest tidal marshes on the west coast of the United States, acted as a refuge habitat with reduced levels of decline or even increased detection probabilities for some species. Our modeling approach demonstrates the power of utilizing disparate datasets to identify regional trends in the distribution of estuarine fishes.

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Conservation of Estuarine Fishes

Cited by 11 publications

References 346 publications

A Spatiotemporal History of Key Pelagic Fish Species in the San Francisco Estuary, CA

A Spatiotemporal History of Key Pelagic Fish Species in the San Francisco Estuary, CA

Differences in Recreational Fishers’ Motivations for Utilising Two Estuarine Fisheries

A Spatiotemporal History of Key San Francisco Estuary Pelagic Fish Species

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