Fisheries - މަސްވެރިކަން
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Item ލޭނު މަސްވެރިކަން : މަސްވެރިކަމުގެ ހުނަރު 1(މިނިސްޓްރީ އޮފް ފިޝަރީޒް އެގްރިކަލްޗަރ އެނޑް މެރިން ރިސޯސަސް, 2024) މުޙައްމަދު މަނިކު; Manik, MohammedItem ދިވެހިރާއްޖޭގެ ދިރޭކުދިމަހުގެ މަސްވެރިކަން މެނޭޖްކުރުމުގެ ޕުލޭން(ްރައީސުލްޖުމްހޫރިއްޔާގެ އޮފީސ, 2020-12-10) ްރައީސުލްޖުމްހޫރިއްޔާގެ އޮފީސ; Raeesuljumhooriyyaa ge OfficeItem Talking points(2022)Item ފާނައިގެ މަސްވެރިކަން ރާވައި ހިންގައި ބެލެހެއްޓުމާބެހޭ ގަވާއިދ(ރައީސުލްޖުމްހޫރިއްޔާގެ އޮފީސް, 2022-01-04) މިނިސްޓްރީ އޮފް ފިޝަރީޒ،ް މެރިން ރިސޯސަސް އެންޑް އެގްރިކަލްޗަރItem Otolith chemical fingerprints of skipjack tuna (Katsuwonus pelamis) in the Indian Ocean : first insights into stock structure delineation(Plos One, 2021-03-29) Guerrero, Antonio MedinaThe chemical composition of otoliths (earbones) can provide valuable information about stock structure and connectivity patterns among marine fish. For that, chemical signatures must be sufficiently distinct to allow accurate classification of an unknown fish to their area of origin. Here we have examined the suitability of otolith microchemistry as a tool to better understand the spatial dynamics of skipjack tuna (Katsuwonus pelamis), a highly valuable commercial species for which uncertainties remain regarding its stock structure in the Indian Ocean. For this aim, we have compared the early life otolith chemical composition of young- of-the-year (<6 months) skipjack tuna captured from the three main nursery areas of the equatorial Indian Ocean (West, Central and East). Elemental (Li:Ca, Sr:Ca, Ba:Ca, Mg:Ca and Mn:Ca) and stable isotopic (δ13C, δ18O) signatures were used, from individuals cap- tured in 2018 and 2019. Otolith Sr:Ca, Ba:Ca, Mg:Ca and δ18O significantly differed among fish from different nurseries, but, in general, the chemical signatures of the three nursery areas largely overlapped. Multivariate analyses of otolith chemical signatures revealed low geographic separation among Central and Eastern nurseries, achieving a maximum overall random forest cross validated classification success of 51%. Cohort effect on otolith trace element signatures was also detected, indicating that variations in chemical signatures associated with seasonal changes in oceanographic conditions must be well understood, particularly for species with several reproductive peaks throughout the year. Otolith micro- chemistry in conjunction with other techniques (e.g., genetics, particle tracking) should be further investigated to resolve skipjack stock structure, which will ultimately contribute to the sustainable management of this stock in the Indian Ocean.Item Exploratory fishing for large pelagic species in the Maldives(Ministry of Fisheries and Agriculture, Republic of Maldives, 2023) Anderson, R. C.; Waheed, AItem Blue economy in small island developing states : status of private sector partnerships and implementation of SDG 14(researchgate.net, 2022-05-21) Manikarachchi, Imali; އިމާލީ މަނިކަރަޗީItem ދިވެހިރާއްޖޭގެ ކަނޑުމަހުގެ މަސްވެރިކަން މެނޭޖްކުރުމުގެ(މިނިސްޓްރީ އޮފް ފިޝަރީޒ،ް މެރިން ރިސޯސަސް އެންޑް އެގްރިކަލްޗަރ, ދިވެހިސަރުކާރުގެ ގެޒެޓް, 2021-01) ދިވެހިސަރުކާރުގެ ގެޒެޓް, ދިވެހިސަރުކާރުގެ ގެޒެޓްItem Tuna behaviour at anchored FADs inferred from local ecological knowledge of tuna fishers in the Maldives(Public Library of Science, 2021-07-29) Jauharee, Ahmed Riyaz; Capello, Manuela; Simier, Monique; Forget, Fabien; Adam, Mohamed Shiham; Dagorn, LaurentThe Maldives tuna fishery landings in 2018 were 148, 000 t and accounted for nearly a quarter of the global pole-and-line tuna catch. This fishery partially relies on a network of 55 anchored fish aggregating devices (AFADs) deployed around the archipelago. About one-third of the total pole-and-line tuna catch is harvested at AFADs. Although the AFAD fishery has existed for 35 years, knowledge on the behaviour of tuna in the AFAD array is still limited, precluding the development of science-based fishery management. In this study, local ecological knowledge (LEK) of fishers was used to improve our understanding of tuna behaviour, through personal interviews of 54 pole-and-line fishers from different parts of the archipelago. Interview results suggest that during the northeast monsoon tuna are more abundant on the eastern side of the Maldives, while during the southwest monsoon they are more abundant on the western side of the Maldives. Most fishers believed that tuna tend to stay at the AFADs for 3 to 6 days and remain within 2 miles from the AFADs when they are associated. Fishers believe that strong currents is the main factor for tuna departure from AFADs, though high sea surface temperatures and stormy conditions were also thought to contribute to departures. Moderate currents are believed to be a favourable condition to form aggregations at the AFADs while other factors such as suitable temperature, prey and attractants enhance this aggregation. Fishers also believe that there are multiple schools segregated according to size and species at AFADs and that catchability is higher at dawn and in the late afternoon when the tuna occur shallower in the water column. This study is an important step towards engaging the Maldivian tuna fishers into a science-based fishery management.Item Reconstruction of total marine catches for the Maldives: 1950 – 2010(School of Marine Science and Engineering, Plymouth University, 2023) Hemmings, Mark; Harper, Sarah; Zeller, DirkThe republic of the Maldives has always relied on its marine resources for food and employment security, and for trade revenue. Traditionally, Maldivian fisheries focused on tuna, shark and live-bait. During the 1970s, rapid development, expansion and diversification (including reef fisheries) of marine fisheries and the tourist industry began. Catch statistics have been recorded by the Ministry of Fisheries, Agriculture and Marine Resources (MoFAMR) since 1959. A total enumeration system has evolved over time, initially focusing on catches by the poleand-line tuna fishery, it has since been expanded to incorporate other gears types and species. A lack of financial and human resources has led to concerns over the accuracy of the catch data reported to the FAO. A catch reconstruction approach, using quantitative and qualitative sources, was used to reconstruct total marine fisheries catches for the 1950-2010 time period. Total reconstructed marine catches were estimated, which were 23% more than the tonnage reported by the Maldives to the FAO. Total catches increased from around 22,000 t·year-1 in the 1950s to a peak of 223,000 t in 2006, before declining to about 143,000 t·year-1 in the late 2000s. When tuna and non-tuna catches were examined separately, large skipjack tuna catches were found to be masking the under-reporting of other species such as grouper, sea cucumber, and sharks, all of which are known to be susceptible to over-fishing. The Maldives fishing and tourism industries, as well as food and employment security are dependent on healthy marine ecosystems, it is therefore imperative that reported catch statistics more accurately reflect total extractions from the marine environment.