The gill-oxygen limitation theory (GOLT) and its critics

Pauly, Daniel

doi:10.1126/sciadv.abc6050

Cited by 137 publications

(159 citation statements)

References 146 publications

(169 reference statements)

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“…Another important factor facilitating the excellent growth performance of O. niloticus in Lake Chamo is the optimum dissolved oxygen (DO) concentration in the lake (Table 5). There is abundant theoretical and empirical support in the literature for oxygen being both a limiting and controlling factor for the growth of fish and aquatic invertebrates (Amarasinghe & Pauly, 2021;Diaz Pauli et al, 2017;Kolding et al, 2008;Meyer & Schill, 2021;Pauly, 1981Pauly, , 2019Pauly, , 2021Peck & Chapelle, 2003;Pörtner & Peck, 2010;. The gill-oxygen limitation theory (GOLT) proposed by Pauly (1981) provides mechanisms for key biological aspects, including food conversion efficiency, growth and the timing of fish maturation.…”

Section: Ta B L Ementioning

confidence: 99%

“…The gill-oxygen limitation theory (GOLT) proposed by Pauly (1981) provides mechanisms for key biological aspects, including food conversion efficiency, growth and the timing of fish maturation. According to the GOLT principle, the surface area of the gills cannot, as a two-dimensional structure, supply fish with sufficient oxygen to keep up with the growth of their three-dimensional bodies (Pauly, 2021). Thus, a lower relative oxygen supply induces sexual maturation and a subsequent slowing and cessation of growth (Amarasinghe & Pauly, 2021;Meyer & Schill, 2021;Pauly, 2021).…”

Section: Ta B L Ementioning

confidence: 99%

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Growth and status of Nile tilapia (Oreochromis niloticus L.) stock in Lake Chamo, Ethiopia

Tesfaye

Getahun

2021

Lakes & Reservoirs

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Global inland freshwater fisheries support livelihoods for several million people. These important resources, however, are suffering from excessive overfishing as a result of increasing fishing pressures attributable to an increased human population and subsequent demand for food and economic livelihoods. To this end, very little is known about the vital population parameters and stock status of Nile tilapia (Oreochromis niloticus) in Lake Chamo in Ethiopia. Thus, the present study focused on determining the Nile tilapia population parameters and assessing their stock status in Lake Chamo, using length-frequency and catch-effort data collected between February 2018 and January 2019 from commercial fish catches from 10 major fish landing sites. The TropFishR software package was used to determine von Bertalanffy growth parameters, and length-converted catch curve and empirical models were used to calculate mortality parameters. The maximum sustainable yield (MSY) and its corresponding level of effort (f MSY ) were determined using the length-based Thompson & Bell yield prediction model. The growth parameters L ∞ , K and Ф′ of the Nile tilapia stock were found to be 59.4-cm, 0.41/year and 3.16, respectively. The annual rate of total (Z), natural (M) and fishing mortality (F) were estimated to be 2.442, 0.558 and 1.884/ year, respectively. The calculated current yield (711 t/year) is lower than the predicted values of MSY (771 t/year). The present level of fishing effort (2564 nets/day) is more than twice higher than the optimum level of fishing effort (1026 nets/day), clearly indicating overfishing of the Nile tilapia stock in the lake. This finding is also substantiated by the high level of exploitation rate (E = 0.771). Thus, a recommendation based on the results of the present study is a 60% reduction in the fishing effort (1538 nets/ day), which will also provide a higher fish yield. The results of the present study also are useful facilitate development of appropriate management strategies for the Nile tilapia fishery in Lake Chamo.

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Section: Ta B L Ementioning

confidence: 99%

Section: Ta B L Ementioning

confidence: 99%

Growth and status of Nile tilapia (Oreochromis niloticus L.) stock in Lake Chamo, Ethiopia

Tesfaye

Getahun

2021

Lakes & Reservoirs

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“…where dW/dt is the growth rate, W is body weight (or mass), H and k are the coefficients of anabolism and catabolism, and d is the scaling exponents of anabolism, which depend on oxygen, and hence of the growth of gill surface area (Pauly 1984(Pauly , 2021.…”

Section: Morphometrics and Growthmentioning

confidence: 99%

The biology and ecology of the invasive silver-cheeked toadfish (Lagocephalus sceleratus), with emphasis on the Eastern Mediterranean

Ulman¹,

Yıldız²,

Demirel³

et al. 2021

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Invasive species pose threats to either human health or inflict ecological and/or economic damage. The silver-cheeked toadfish (Lagocephalus sceleratus), a Lessepsian species, is one of the most harmful species in the Mediterranean Sea, because of its potent neurotoxin, impacts on marine biodiversity, and the increased costs and labor they inflict on fishers. Since the catch and consumption of this pufferfish is prohibited by almost all countries bordering the Mediterranean, they have now expanded into the entire Mediterranean and Black Sea. We performed a comprehensive study of L. sceleratus covering ecological aspects, growth, reproduction, diet and trophic level based on samples from southwestern coasts of Turkey. The estimated growth parameters were L∞ = 88.7 cm, K = 0.27 year-1, C = 0.6 and WP = 0.1. Their sex-ratio was M/F = 1:0.69. Lagocephalus sceleratus appears to be a batch spawner with discontinuous oocyte recruitment and has different spawning seasons in the Eastern Mediterranean which seem to be based on temperature cues which get shorter in duration as one moves north from the Suez. We also report their first positive ecological trait, that they are controlling some other invasive species through their diets, such as lionfish, Red Sea goatfish, rabbitfish and longspine sea urchins, in addition to controlling themselves through cannibalism, which appears to be density-dependent. They are indeed a top predator in the region with a trophic level of 4.1. We suggest that targeted fishing using improved gear-types to reduce fishing gear damages are initiated, and that finding commercial markets for pufferfish could help to naturally fund ongoing control efforts.

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“…As the ocean warms, reduced dissolved oxygen in the water may have adaptive disadvantages for large fish. The argument that the ratio of gill surface area to body mass decreases with body size (Cheung et al., 2013; Pauly, 2021; Pauly & Cheung, 2018) implies that chondrichthyans are likely to be disadvantaged more than teleosts and invertebrates, given chondrichthyans are among the largest animals in the marine environment. In southern Australia, the ratio of the number of chondrichthyan to teleost animals caught in highly size‐selective gillnets increases linearly with mesh size from 0.34 for a 2‐inch (51 mm) mesh size to 24.25 for a 9‐inch (229 mm) mesh size (Walker et al., 2005).…”

Section: Discussionmentioning

confidence: 99%

Ecological vulnerability of the chondrichthyan fauna of southern Australia to the stressors of climate change, fishing and other anthropogenic hazards

et al. 2021

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We develop a potentially widely applicable framework for analysing the vulnerability, resilience risk and exposure of chondrichthyan species to all types of anthropogenic stressors in the marine environment. The approach combines the three components of widely applied vulnerability analysis (exposure, sensitivity and adaptability) (ESA) with three components (exposure, susceptibility and productivity) (ESP) of our adaptation of productivity–susceptibility analysis (PSA). We apply our 12‐step ESA‒ESP analysis to evaluate the vulnerability (risk of a marked reduction of the population) of each of 132 chondrichthyan species in the Exclusive Economic Zone of southern Australia. The vulnerability relates to a species’ resilience to a spatial (or suitability) reduction of its habitats from exposure to up to eight climate change stressors. Vulnerability also relates to anthropogenic mortality added to natural mortality from exposure to the stressors of five types of fishing and seven other types of anthropogenic hazards. We use biological attributes as risk factors to evaluate risk related to resilience at the species or higher taxonomic level. We evaluate each species’ exposure to anthropogenic stressors by assigning it to one of six ecological groups based on its lifestyle (demersal versus pelagic) and habitat, defined by bathymetric range and substrates. We evaluate vulnerability for 11 scenarios: 2000–2006 when fishing effort peaked; 2018 following a decade of fisheries management reforms; low, medium and high standard future carbon dioxide equivalent emissions scenarios; and their six possible climate–fishing combinations. Our results demonstrate the value of refugia from fishing and how climate change exacerbates the risks from fishing.

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The gill-oxygen limitation theory (GOLT) and its critics

Cited by 137 publications

References 146 publications

Growth and status of Nile tilapia (Oreochromis niloticus L.) stock in Lake Chamo, Ethiopia

Growth and status of Nile tilapia (Oreochromis niloticus L.) stock in Lake Chamo, Ethiopia

The biology and ecology of the invasive silver-cheeked toadfish (Lagocephalus sceleratus), with emphasis on the Eastern Mediterranean

Ecological vulnerability of the chondrichthyan fauna of southern Australia to the stressors of climate change, fishing and other anthropogenic hazards

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