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Abe Keita Ishimura Gakushi Baba Shinya Yasui Shota Nakamura Kosuke 《Fisheries Science》2022,88(1):191-202
The spread of coronavirus disease 2019 (COVID-19) and subsequent lockdown measures have impacted economies and industries worldwide. The fisheries industry witnessed a sharp decline in demand and a slump in fish prices due to its dependence on the food service industry. It is important to quantitatively assess those fish species affected most and the extent of the pandemic’s impact on them, to take specific countermeasures. We propose a time-series analysis as an alternative to the current practice of using ad hoc year-on-year comparisons. Although the pandemic makes it difficult to construct a counterfactual approach due to the lack of an appropriate control group, we use time-series forecasting to simulate normal conditions using pre-pandemic data. In Tokyo, the unit price of fish species that were negatively impacted by the food services industry dropped by 12.65% to 14.64%, and by 26.08% to 28.22% after the declaration of a state of emergency. Seasonality, short weekly cycles, and short-term market trends are factors that affect the price of fish. Species-specific impact estimates related to the COVID-19 pandemic can allow policymakers to implement recovery measures in a more targeted and effective manner. The results of our analysis can increase fishers’ and policymakers’ awareness of the usefulness of economic analyses and incentivize them to release data to establish a system to accumulate and analyze data strategically for urgent and appropriate interventions in the fisheries industry.
相似文献2.
Satoshi TSUKAMOTO Taichi HARA Atsushi YAMAMOTO Yuki OHTA Ayako WADA Yuka ISHIDA Seiji KITO Tetsu NISHIKAWA Naojiro MINAMI Ken SATO Toshiaki KOKUBO 《The Journal of reproduction and development》2013,59(1):33-39
Lysosomes are acidic and highly dynamic organelles that are essential for macromolecule
degradation and many other cellular functions. However, little is known about lysosomal
function during early embryogenesis. Here, we found that the number of lysosomes increased
after fertilization. Lysosomes were abundant during mouse preimplantation development
until the morula stage, but their numbers decreased slightly in blastocysts. Consistently,
the protein expression level of mature cathepsins B and D was high from the one-cell to
morula stages but low in the blastocyst stage. One-cell embryos injected with siRNAs
targeted to both lysosome-associated membrane protein 1 and 2 (LAMP1 and LAMP2) were
developmentally arrested at the two-cell stage. Pharmacological inhibition of lysosomes
also caused developmental retardation, resulting in accumulation of lipofuscin. Our
findings highlight the functional changes in lysosomes in mouse preimplantation
embryos. 相似文献
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Bayesian surplus production models were developed for assessing the North Pacific swordfish population under alternative scenarios:
a single-stock scenario and a two-stock scenario with subareas that represented the western central and eastern Pacific Ocean
regions. Biomass production was modeled with a three-parameter production model that allowed production to vary from the symmetric
Schaefer curve using an estimated shape parameter. Lognormal prior distributions for intrinsic growth rate and carrying capacity
were assumed. Goodness-of-fit diagnostics were developed for comparing the fits of alternative model configurations based
on the root-mean squared error of catch per unit effort (CPUE) fits and the standardized CPUE residuals. Production model
fits for 1952–2006 indicated that the Japanese longline CPUE numbers were influential under each stock scenario because these
scenarios were the longest time series of relative abundance indices. Model results also indicated that assumptions about
the prior means for intrinsic growth rate and carrying capacity may be important based on the model configuration. 相似文献
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Keita Abe Gakushi Ishimura Tetsuya Tsurumi Shunsuke Managi Ussif Rashid Sumaila 《Fisheries Science》2017,83(6):897-906
Although trade liberalization may increase a country’s welfare, its specific effect on a country’s fishing industry has not been well studied. By decomposing the effect of international trade into four parts, i.e., scale-technique effects (ST), the indirect trade-induced composition effect (IC), the indirect effect of trade intensity through income (ITC), and the direct effect of trade intensity (DTC), this study empirically investigates the effect of trade openness on country-level fisheries production. To take into account the endogeneity of trade openness and income, we adopt the instrumental variable approach. We find that a rise in trade openness reduces fisheries catch on average. In particular, the long-run effect is large. This result implies that future production is affected by current overfishing through stock dynamics. Our decomposed elasticities indicate that the ST and ITC dominate in the trade elasticity of fisheries catch. While ST implies that overfishing would be affected by trade, ITC may either establish an “overfishing haven”, similar to a “pollution haven” in the environmental literature, or production shift of fisheries to countries with lax regulation to pass stringent regulation, which is more likely to occur in high-income countries. 相似文献
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One important component in determining the market value of fish is freshness, essentially the time period from capture to consumer. By shortening the time from harvest to landing, freshness can be improved and thus the market value may increase. The opportunistic nature of the marine capture fisheries sector, however, can encourage fishers to extend their time at sea to catch additional fish, while retaining already harvested fish. Here, fishers face a tradeoff: extending the duration of their operations, but compromising their ability to maintain product freshness. This study estimates the freshness premium for two fish species, swordfish and blue shark, landed at Kesennuma, Japan. Swordfish is generally destined for the raw market, while blue shark is first processed into several products. Our results suggest substantial heterogeneity in the freshness premium, depending on the likelihood of a product being consumed fresh or after processing. This work is an important investigation in the Kesennuma region, which suffered devastating damage from the tsunami following the Tohoku Earthquake. 相似文献
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The rise and fall of Japan’s marine fisheries have been well documented and are clearly evident in official landings statistics. However, the extent of illegal, unreported and unregulated fisheries, including recreational fisheries, and the discarding of unwanted catch in Japanese waters, both of which may have significant implications on the success of management regimes, have yet to be closely examined. This study reassessed the impact of fisheries on the marine ecosystems of Japan’s Exclusive Economic Zones (EEZ) by estimating the total marine biomass removed through the use of an established catch reconstruction approach. Since 1950, 368 million t of marine biomass have been extracted from the Japanese EEZ as commercial catch, recreational catch, illegal catch and discards. Commercial catch accounted for 87 % of the total, while discards accounted for an additional 8 %. The disparity between the estimated biomass removals and the reported commercial catch is 48 million t, or 15 % of the reported catch. The difference is not as large as observed in similar studies of other regions. Nonetheless, the reconstructed biomass removals represent a better baseline for the management of fisheries in the Japanese EEZ, particularly if Japan is to move forward with implementation of output control management. 相似文献
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