This corrects the article DOI: 10.1371/journal.pone.0300820..This corrects the article DOI: 10.1371/journal.pone.0300820..
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
2.
Global significance of seagrass fishery activity Nordlund, Lina M; Unsworth, Richard K F; Gullström, Martin ...
Fish and fisheries (Oxford, England),
20/May , Letnik:
19, Številka:
3
Journal Article
Recenzirano
Odprti dostop
Seagrass meadows support fisheries through provision of nursery areas and trophic subsidies to adjacent habitats. As shallow coastal habitats, they also provide key fishing grounds; however, the ...nature and extent of such exploitation are poorly understood. These productive meadows are being degraded globally at rapid rates. For degradation to cease, there needs to be better appreciation for the value of these habitats in supporting global fisheries. Here, we provide the first global scale study demonstrating the extent, importance and nature of fisheries exploitation of seagrass meadows. Due to a paucity of available data, the study used a global expert survey to demonstrate the widespread significance of seagrass‐based fishing activity. Our study finds that seagrass‐based fisheries are globally important and present virtually wherever seagrass exists, supporting subsistence, commercial and recreational activity. A wide range of fishing methods and gear is used reflecting the spatial distribution patterns of seagrass meadows, and their depth ranges from intertidal (accessible by foot) to relatively deep water (where commercial trawls can operate). Seagrass meadows are multispecies fishing grounds targeted by fishers for any fish or invertebrate species that can be eaten, sold or used as bait. In the coastal communities of developing countries, the importance of the nearshore seagrass fishery for livelihoods and well‐being is irrefutable. In developed countries, the seagrass fishery is often recreational and/or more target species specific. Regardless of location, this study is the first to highlight collectively the indiscriminate nature and global scale of seagrass fisheries and the diversity of exploitative methods employed to extract seagrass‐associated resources. Evidence presented emphasizes the need for targeted management to support continued viability of seagrass meadows as a global ecosystem service provider.
We investigated the status and population structure of Percnon gibbesi in three areas of the island of Gran Canaria (Canary Islands, Central-East Atlantic) between July 2020 and December 2021. A ...total of 999 individuals were captured. Monthly sampling allowed us to establish the reproductive season according to the presence of ovigerous females. The methodology and number of individuals analysed were suitable for establishing the length-weight relationships and the life history parameters via modal progression analysis. The analysis of the catches per unit effort (CPUE) revealed the abundance of Percnon gibbesi in the three areas and seems to not conform with the catch quotas established in the Canary Islands Fisheries Law. Percnon gibbesi is a native crab species characteristic of intertidal and subtidal zones of the Atlantic coast of the European Macaronesian archipelagos (Azores, Madeira, and Canary Islands), and probably also in the neighbouring rocky coasts of northwest Africa. P. gibbesi is considered an invasive alien species in almost all of the Mediterranean, with expanding populations from Spain to Turkey, including Libya; However, its biology and ecology are highly unknown, despite all its range of distribution. In the intertidal zones of Gran Canaria Island, this crab, in the intertidal zones of Gran Canaria Island, shows a carapace length range between 4.1 and 22.7 mm (4.1-22.7 in males and 5.7-22.3 in females), where females showed higher weights and lengths than males on average; However, males predominated in all samples, with a sex ratio of 1:0.57. The Lsub.∞ for this crab was estimated to be 27 ± 3 mm (23 ± 4 mm for females and 25 ± 4 mm for males). The growth coefficient (K) was 0.24 yearsup.−1, the total mortality (Z) was Z = 1.71 yearsup.−1, and the natural mortality (M) was 0.47 yearsup.−1 sub.. Although females grow faster than males, males are more abundant in the larger length classes. Although the presence of ovigerous females indicated that reproduction takes place twice a year, from March to April and from August to September, the number of cohorts detected by the modal progression analysis showed that reproduction takes place all year.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
Fenneropenaeus chinensis is an important economic species in the north of China, and plays an important role in both marine fishing and aquaculture. Long-term overfishing has led to the rapid decline ...of wild F. chinensis resources. The traditional trawl survey could not meet the demands of the F. chinensis resource survey. In this study, environmental DNA (eDNA) technology was used to evaluate the biomass of F. chinensis in the traditional Qinghai (Qingdao Haiyang) fishing ground in the southern sea area of the Shandong Peninsula, with the purpose of verifying whether eDNA technology can provide a new resource assessment method for fisheries resource species such as F. chinensis. The eDNA quantitative results of the Qingdao water samples ranged from 1972 copies/L to 6937 copies/L, with an average of 4366 ±1691 copies/L. Those in Haiyang water samples ranged from 4795 copies/L to 8715 copies/L, with an average of 6737 ± 1348 copies/L. The concentration of eDNA in shrimp culture ponds ranged from 1.14 × 10sup.6 copies/L to 7.61 × 10sup.6 copies/L, with an average of 3.33 × 10sup.6 ± 2.28 × 10sup.6 copies/L. The amount of eDNA released by each gram of F. chinensis per 24 h was about 2.91 × 10sup.6 copies. According to this calculation, it was estimated that the distribution of F. chinensis was about one shrimp in every 300 msup.2 sea area. Similarly, it is estimated that one shrimp is distributed every 240 msup.2 in the Haiyang sea area. The result of this study confirms the feasibility of using eDNA to evaluate the biomass of shrimps.
El año 2022 es el Año Internacional de la Pesca y la Acuicultura Artesanales. La elección de este momento pretende proporcionar un hito importante para evaluar el progreso hacia la meta de "apoyar la ...pesca a pequeña escala" y compartir buenas prácticas en todo el mundo. Sin embargo, la medición de esta meta puede resultar francamente difícil, por lo que conviene comenzar por reconocer la indudable importancia de este tipo de pesca y seleccionar los interlocutores válidos en la materia de cara a poder implementar un plan de acción válido. El momento resulta coincidente con las convocatorias en diversos países de la UE con cargo a Fondos Next Generation, que pueden contribuir a la modernización y transformación del sector, por lo que se analizan los PERTE más adecuados para el caso de España.
Abstract
As a result of the evaluation of the indicators of a large fishing enterprise of the Volga-Caspian basin (carrying out extraction and processing of biological resources), proposals were ...presented to reduce the value of the property and sources of financing of the organization, and this decrease was generally balanced with changes in revenue and profit of the enterprise. Considering the results of the analysis, as well as external and internal factors of the organization’s functioning, it is recommended to create a planning system to ensure financial stability in subsequent periods. Implementation is possible with the organization of the budgeting process. A stock management strategy was proposed to optimize their volume and structure. ABC analysis was used for this purpose, which made it possible to strengthen control over the main types of stocks and improve management efficiency. The proposed measures will facilitate the release of funds and contribute to the stabilization of the financial condition of the enterprise.
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