Impacts of Ocean Warming on China's Fisheries Catches: An Application of “Mean Temperature of the Catch” Concept

Liang, Cui; Xian, Weiwei; Pauly, Daniel

doi:10.3389/fmars.2018.00026

Cited by 39 publications

(23 citation statements)

References 25 publications

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“…Thus, an increase in MTC would indicate more warm-water species in the catch and/or a decrease in the amount of cool-water species. Recent analyses in the Mediterranean Sea (Tsikliras & Stergiou 2014) and China's seas (Liang et al 2018) supported global observations about the increase in the MTC at a regional scale. Other studies used fishery-independent data to estimate and compare MTC results with those obtained using landings data (Keskin & Pauly 2014, Tsikliras et al 2015, or took into account habitat characteristics and indirect measures of fishing effects (Maharaj et al 2018, Tsikliras et al 2019.…”

Section: Introductionsupporting

confidence: 55%

Evidence of ocean warming in Uruguay’s fisheries landings: the mean temperature of the catch approach

Gianelli¹,

Ortega²,

Marín³

et al. 2019

Mar. Ecol. Prog. Ser.

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Distribution, abundance and life history traits of marine fish and invertebrates are increasingly affected by ocean warming. Consequently, landings of traditional fisheries and their relative species composition could potentially be modified. The mean temperature of the catch (MTC) concept, which refers to the average inferred temperature preference of exploited species weighted by their annual catch for a given area, was applied to Uruguay's industrial fisheries. This approach allowed us to assess the evidence of ocean warming in long-term Uruguayan landings (1973−2017), which were mostly obtained from a major marine warming hotspot. Results showed a marked shift in MTC through time, with the first 10−15 yr characterized by a decreasing trend, but subsequently increasing steadily over time. Long-term effects of ocean warming have led to a shift from cool-water to warm-water species in the relative representation of local landings. A significant and consistent association between sea surface temperature and MTC increase was observed, even when accounting for other drivers. This study provides the first quantitative evidence that ocean warming has been increasingly affecting Uruguayan industrial fisheries during the past decades, and calls for an urgent need to consider environmental changes to properly manage fish stocks, particularly those shared with neighboring countries.

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Section: Introductionsupporting

confidence: 55%

Evidence of ocean warming in Uruguay’s fisheries landings: the mean temperature of the catch approach

Gianelli¹,

Ortega²,

Marín³

et al. 2019

Mar. Ecol. Prog. Ser.

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show abstract

“…This attitude is very problematic at a time when we, as a scientific community, are challenged to devise novel ways to protect marine and freshwater biodiversity threatened by overfishing, pollution, and habitat modification (3,4) and by global changes with its attendant ills, ocean and freshwater warming (5)(6)(7)(8)(9), and acidification and deoxygenation (10)(11)(12). This is why the gill-oxygen limitation theory (GOLT) is being reintroduced here, and the case made for it to be seriously (re-)examined.…”

Section: Introduction the Need For A Theorymentioning

confidence: 99%

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

2021

Self Cite

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The gill-oxygen limitation theory (GOLT) provides mechanisms for key aspects of the biology (food conversion efficiency, growth and its response to temperature, the timing of maturation, and others) of water-breathing ectotherms (WBEs). The GOLT’s basic tenet is that the surface area of the gills or other respiratory surfaces of WBE cannot, as two-dimensional structures, supply them with sufficient oxygen to keep up with the growth of their three-dimensional bodies. Thus, a lower relative oxygen supply induces sexual maturation, and later a slowing and cessation of growth, along with an increase of physiological processes relying on glycolytic enzymes and a declining role of oxidative enzymes. Because the “dimensional tension” underlying this argument is widely misunderstood, emphasis is given to a detailed refutation of objections to the GOLT. This theory still needs to be put on a solid quantitative basis, which will occur after the misconceptions surrounding it are put to rest.

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“…For tambaqui, Oliveira and Val (2017) found a decrease in the feed efficiency of the animals submitted to the drastic scenario A2 (increase of 4.5 • C and 850+ ppm of CO 2 in relation to the current levels) as predicted for the year 2100 by the IPCC (2007), suggesting increases in the cost of production due to the increase in food consumption and rearing time. Thus, in the coming decades, the great challenge will be to promote the development of techniques that ensure optimal fish growth rates under global warming scenarios (Baudron et al, 2014;Liang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Growing in the Dark Warmth: The Case of Amazonian Fish Colossoma macropomum

2018

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Photoperiod is considered an important synchronizer of biological activities and endocrine pathways, including growth. As ectotherms, fish have many physiological functions controlled by the photoperiod. However, the combined effects of photoperiod and temperature should be clarified, particularly for tropical fish living near their upper thermal limit, as is the case of Amazonian fish. The central aim of this study was to evaluate the combined effect of photoperiod and temperature on growth and physiological aspects of tambaqui (Colossoma macropomum). Juveniles of tambaqui were distributed in 70 L tank, following a factorial design that included three photoperiods (light 0 h: darkness 24 h; light 12 h: darkness 12 h; and light 18 h: darkness 6 h) associated with three temperatures (26, 29, and 32 • C). They were maintained under these conditions for 2 months. Fish reared in the dark at 29 and 32 • C showed better performance compared to fish reared under extended light conditions at all temperatures. Among physiological responses, it has been observed that blood parameters tend to be disturbed with increasing temperature and that extended light conditions at low temperatures caused similar effects on the analyzed fish, suggesting blood hemoconcentration. Fish under extended light conditions showed an increase in glucose, cortisol, cholesterol, and total proteins, indicating additional physiological disturbances. In conclusion, our study shows that, unlike marine and temperate fish, C. macropomum, a fish species endemic to the Amazon, grows better in warmth dark, showing no significant physiological disturbances, similar to observations described for wild animals of this species. Our results support that changes in fish growth occur in response to environmental conditions. Therefore, fish species from freshwater, estuarine, and marine environments, must be specifically analyzed regarding the combination effects of photoperiod and temperature.

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Impacts of Ocean Warming on China's Fisheries Catches: An Application of “Mean Temperature of the Catch” Concept

Cited by 39 publications

References 25 publications

Evidence of ocean warming in Uruguay’s fisheries landings: the mean temperature of the catch approach

Evidence of ocean warming in Uruguay’s fisheries landings: the mean temperature of the catch approach

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

Growing in the Dark Warmth: The Case of Amazonian Fish Colossoma macropomum

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