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https://www.readbyqxmd.com/read/28806740/community-and-government-managed-marine-protected-areas-increase-fish-size-biomass-and-potential-value
#1
Angelica A D Chirico, Timothy R McClanahan, Johan S Eklöf
Government-managed marine protected areas (MPAs) can restore small fish stocks, but have been heavily criticized for excluding resource users and creating conflicts. A promising but less studied alternative are community-managed MPAs, where resource users are more involved in MPA design, implementation and enforcement. Here we evaluated effects of government- and community-managed MPAs on the density, size and biomass of seagrass- and coral reef-associated fish, using field surveys in Kenyan coastal lagoons...
2017: PloS One
https://www.readbyqxmd.com/read/28806547/environmental-life-cycle-assessment-of-seafood-production-a-case-study-of-trawler-catches-in-tunisia
#2
Khaled Abdou, Didier Gascuel, Joël Aubin, Mohamed Salah Romdhane, Frida Ben Rais Lasram, François Le Loc'h
The Gulf of Gabes is one of the most productive fishery areas in the southern Mediterranean Sea. It is archetypal of an ecosystem in which the effects of fisheries are most pronounced. Demersal trawling is the main fishing activity in the Gulf of Gabes. Life Cycle Assessment (LCA) was applied to assess the environmental performance landing 1t of seafood with wooden demersal trawlers in the Gulf of Gabes. Impact categories included in the study were abiotic depletion potential (ADP), acidification potential (AP), eutrophication potential (EP), global warming potential (GWP), ozone depletion potential (ODP), photochemical oxidant formation potential (POFP), human toxicity potential (HTP), marine eco-toxicity potential (METP), terrestrial eco-toxicity potential (TETP), land occupation potential (LOP), and total cumulative energy demand (TCED)...
August 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28805020/evaluation-of-bovine-viral-diarrhoea-virus-control-strategies-in-dairy-herds-in-hokkaido-japan-using-stochastic-modelling
#3
S Sekiguchi, P Presi, R Omori, K Staerk, M Schuppers, N Isoda, Y Yoshikawa, T Umemura, H Nakayama, Y Fujii, Y Sakoda
Bovine viral diarrhoea virus (BVDV) infection in cattle can result in growth retardation, reduced milk production, reproductive disorders and death. Persistently infected animals are the primary source of infection. In Hokkaido, Japan, all cattle entering shared pastures in summer are vaccinated before movement for disease control. Additionally, these cattle may be tested for BVDV and culled if positive. However, the effectiveness of this control strategy aiming to reduce the number of BVDV-infected animals has not been assessed...
August 14, 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/28800471/microplastic-ingestion-by-mullus-surmuletus-linnaeus-1758-fish-and-its-potential-for-causing-oxidative-stress
#4
C Alomar, A Sureda, X Capó, B Guijarro, S Tejada, S Deudero
A total of 417 striped red mullet, Mullus surmuletus, were analyzed to study microplastic ingestion and livers of fish were assessed to study effects of microplastics. Nearly one third (27.30%) of the individuals were quantified to ingest microplastics although there was no evidence of oxidative stress or cellular damage in the liver of fish which had ingested microplastics. A small increase in the activity of glutathione S-transferase (GST) of M. surmuletus was detected which could be suggesting an induction of the detoxification systems but these findings should be tested in laboratory conditions under a controlled diet and known concentration of microplastics...
August 8, 2017: Environmental Research
https://www.readbyqxmd.com/read/28800358/global-change-in-the-trophic-functioning-of-marine-food-webs
#5
Aurore Maureaud, Didier Gascuel, Mathieu Colléter, Maria L D Palomares, Hubert Du Pontavice, Daniel Pauly, William W L Cheung
The development of fisheries in the oceans, and other human drivers such as climate warming, have led to changes in species abundance, assemblages, trophic interactions, and ultimately in the functioning of marine food webs. Here, using a trophodynamic approach and global databases of catches and life history traits of marine species, we tested the hypothesis that anthropogenic ecological impacts may have led to changes in the global parameters defining the transfers of biomass within the food web. First, we developed two indicators to assess such changes: the Time Cumulated Indicator (TCI) measuring the residence time of biomass within the food web, and the Efficiency Cumulated Indicator (ECI) quantifying the fraction of secondary production reaching the top of the trophic chain...
2017: PloS One
https://www.readbyqxmd.com/read/28798734/mixotrophic-phytoflagellate-bacterivory-field-measurements-strongly-biased-by-standard-approaches-a-case-study
#6
Ruth Anderson, Klaus Jürgens, Per J Hansen
Bacterivory among small (≤20 μm) phytoflagellates (SP) is increasingly recognized as a globally relevant phenomenon, impacting a wide range of aspects from primary production levels to marine fisheries. However, to correctly parametrize mixotrophic SP in biogeochemical and food web models, a better understanding of the magnitude and regulation of in situ SP feeding is urgently needed. Current methods to determine SP bacterivory in the field may introduce biases by treating these organisms as equivalent to heterotrophic nanoflagellates (HNF)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28794280/marine-reserves-solve-an-important-bycatch-problem-in-fisheries
#7
Alan Hastings, Steven D Gaines, Christopher Costello
Management of the diverse fisheries of the world has had mixed success. While managing single species in data-rich environments has been largely effective, perhaps the greatest challenge facing fishery managers is how to deal with mixed stocks of fish with a range of life histories that reside in the same location. Because many fishing gears are nonselective, and the costs of making gear selective can be high, a particular problem is bycatch of weak stocks. This problem is most severe when the weak stock is long-lived and has low fecundity and thus requires a very long recovery time once overfished...
August 9, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28792964/turtle-soup-prohibition-and-the-population-genetic-structure-of-diamondback-terrapins-malaclemys-terrapin
#8
Paul E Converse, Shawn R Kuchta, J Susanne Hauswaldt, Willem M Roosenburg
Diamondback terrapins (Malaclemys terrapin) were a popular food item in early twentieth century America, and were consumed in soup with sherry. Intense market demand for terrapin meat resulted in population declines, notably along the Atlantic seaboard. Efforts to supply terrapins to markets resulted in translocation events, as individuals were moved about to stock terrapin farms. However, in 1920 the market for turtle soup buckled with the enactment of the eighteenth amendment to the United States' Constitution-which initiated the prohibition of alcoholic drinks-and many terrapin fisheries dumped their stocks into local waters...
2017: PloS One
https://www.readbyqxmd.com/read/28791155/simulated-seal-scarer-sounds-scare-porpoises-but-not-seals-species-specific-responses-to-12%C3%A2-khz-deterrence-sounds
#9
Lonnie Mikkelsen, Line Hermannsen, Kristian Beedholm, Peter Teglberg Madsen, Jakob Tougaard
Acoustic harassment devices (AHD) or 'seal scarers' are used extensively, not only to deter seals from fisheries, but also as mitigation tools to deter marine mammals from potentially harmful sound sources, such as offshore pile driving. To test the effectiveness of AHDs, we conducted two studies with similar experimental set-ups on two key species: harbour porpoises and harbour seals. We exposed animals to 500 ms tone bursts at 12 kHz simulating that of an AHD (Lofitech), but with reduced output levels (source peak-to-peak level of 165 dB re 1 µPa)...
July 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28791145/humpback-whales-feed-on-hatchery-released-juvenile-salmon
#10
Ellen M Chenoweth, Janice M Straley, Megan V McPhee, Shannon Atkinson, Steve Reifenstuhl
Humpback whales are remarkable for the behavioural plasticity of their feeding tactics and the diversity of their diets. Within the last decade at hatchery release sites in Southeast Alaska, humpback whales have begun exploiting juvenile salmon, a previously undocumented prey. The anthropogenic source of these salmon and their important contribution to local fisheries makes the emergence of humpback whale predation a concern for the Southeast Alaska economy. Here, we describe the frequency of observing humpback whales, examine the role of temporal and spatial variables affecting the probability of sighting humpback whales and describe prey capture behaviours at five hatchery release sites...
July 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28791040/rocking-the-boat-damage-to-eelgrass-by-swinging-boat-moorings
#11
Richard K F Unsworth, Beth Williams, Benjamin L Jones, Leanne C Cullen-Unsworth
Seagrass meadows commonly reside in shallow sheltered embayments typical of the locations that provide an attractive option for mooring boats. Given the potential for boat moorings to result in disturbance to the seabed due to repeated physical impact, these moorings may present a significant threat to seagrass meadows. The seagrass Zostera marina (known as eelgrass) is extensive across the northern hemisphere, forming critical fisheries habitat and creating efficient long-term stores of carbon in sediments...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28790191/inner-workings-climate-change-complicates-fisheries-modeling-and-management
#12
Gayathri Vaidyanathan
No abstract text is available yet for this article.
August 8, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28783740/seasonal-variability-shapes-resilience-of-small-scale-fisheries-in-baja-california-sur-mexico
#13
Kara E Pellowe, Heather M Leslie
Small-scale fisheries are an important source of food and livelihoods to coastal communities around the world. Understanding the seasonality of fisheries catch and composition is crucial to fisheries management, particularly in the context of changing environmental and socioeconomic conditions. While seasonal variability directly impacts the lives of fishers, most fisheries studies focus on longer-term change. Here we examine seasonal variability in the small-scale fisheries of Baja California Sur, Mexico based on 13 years of government fisheries data...
2017: PloS One
https://www.readbyqxmd.com/read/28781188/distribution-and-antimicrobial-susceptibility-of-vibrio-species-associated-with-zooplankton-in-coastal-area-of-korea
#14
Ji Hye Yang, Jong Soo Mok, Yeoun Joong Jung, Ka Jeong Lee, Ji Young Kwon, Kunbawui Park, Seong Yong Moon, Soon Jae Kwon, A Ra Ryu, Tea Seek Lee
Vibrio parahaemolyticus and V. vulnificus are the most common pathogens causing seafood-borne illnesses in Korea. This study determines the abundance and antimicrobial resistance of pathogenic Vibrio species in seawater and zooplankton samples from the Geoje Island coast in Korea, which is an important area for coastal fisheries, the fishing industry, and tourism. The two Vibrio species were detected more in mesozooplankton samples than in seawater samples. V. parahaemolyticus isolates showed greater resistance than those of V...
August 4, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28776870/marine-terminating-glaciers-sustain-high-productivity-in-greenland-fjords
#15
Lorenz Meire, John Mortensen, Patrick Meire, Thomas Juul-Pedersen, Mikael K Sejr, Søren Rysgaard, Rasmus Nygaard, Philippe Huybrechts, Filip J R Meysman
Accelerated mass loss from the Greenland ice sheet leads to glacier retreat and an increasing input of glacial meltwater to the fjords and coastal waters around Greenland. These high latitude ecosystems are highly productive and sustain important fisheries, yet it remains uncertain how they will respond to future changes in the Arctic cryosphere. Here we show that marine-terminating glaciers play a crucial role in sustaining high productivity of the fjord ecosystems. Hydrographic and biogeochemical data from two fjord systems adjacent to the Greenland ice sheet, suggest that marine ecosystem productivity is very differently regulated in fjords influenced by either land-terminating or marine-terminating glaciers...
August 4, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28776761/fishing-gear-restrictions-and-biomass-gains-for-coral-reef-fishes-in-marine-protected-areas
#16
Stuart J Campbell, Graham J Edgar, Rick D Stuart-Smith, German Soler, Amanda E Bates
Strong empirical evidence supports recovery of reef fish populations with fishery closures. In countries where full exclusion of people from fishing may be perceived as inequitable, fishing gear restrictions on non-selective and destructive gears may offer socially relevant management alternatives to build recovery of fish biomass. Even so, very few studies have statistically compared the responses of tropical reef fisheries to alternative management strategies. Here we test for the effects of fishery closures and fishing gear restrictions on tropical reef fish biomass, at the community and family level, at 1,396 underwater surveys conducted at 617 unique sites across a spatial hierarchy within 22 global marine ecoregions representing five realms...
August 4, 2017: Conservation Biology: the Journal of the Society for Conservation Biology
https://www.readbyqxmd.com/read/28771612/comparison-of-diets-for-largemouth-and-smallmouth-bass-in-eastern-lake-ontario-using-dna-barcoding-and-stable-isotope-analysis
#17
Erich J H Nelson, Jeremy Holden, Robert Eves, Bruce Tufts
Largemouth (LMB: Micropterus salmoides) and Smallmouth Bass (SMB: Micropterus dolomieu) are important species in the recreational fisheries of the Laurentian Great Lakes. The invasion of the Round Goby (Neogobius melanostomus) into these lakes has changed several facets of black bass biology, but there is still much to learn about the relationship between these species. Previous dietary analyses have shown Round Goby to be important prey for bass, but have been limited by low visual identification rates of dissected stomach items...
2017: PloS One
https://www.readbyqxmd.com/read/28771583/predicting-the-effect-of-seine-rope-layout-pattern-and-haul-in-procedure-on-the-effectiveness-of-demersal-seine-fishing-a-computer-simulation-based-approach
#18
Nina A H Madsen, Karl G Aarsæther, Bent Herrmann
Demersal Seining is an active fishing method applying two long seine ropes and a seine net. Demersal seining relies on fish responding to the seine rope as it moves during the fishing process. The seine ropes and net are deployed in a specific pattern encircling an area on the seabed. In some variants of demersal seining the haul-in procedure includes a towing phase where the fishing vessel moves forward before starting to winch in the seine ropes. The initial seine rope encircled area, the gradual change in it during the haul-in process and the fish's reaction to the moving seine ropes play an important role in the catch performance of demersal seine fishing...
2017: PloS One
https://www.readbyqxmd.com/read/28771508/follow-that-fish-uncovering-the-hidden-blue-economy-in-coral-reef-fisheries
#19
Shanna Grafeld, Kirsten L L Oleson, Lida Teneva, John N Kittinger
Despite their importance for human well-being, nearshore fisheries are often data poor, undervalued, and underappreciated in policy and development programs. We assess the value chain for nearshore Hawaiian coral reef fisheries, mapping post-catch distribution and disposition, and quantifying associated monetary, food security, and cultural values. We estimate that the total annual value of the nearshore fishery in Hawai'i is $10.3-$16.4 million, composed of non-commercial ($7.2-$12.9 million) and commercial ($2...
2017: PloS One
https://www.readbyqxmd.com/read/28770585/life-history-and-initial-assessment-of-fishing-impacts-on-the-by-catch-species-dules-auriga-teleostei-serranidae-in-southern-brazil
#20
A T Rovani, L G Cardoso
The life history of Dules auriga, a small hermaphrodite serranid species inhabiting deep waters and a frequent component of the discarded catch of bottom trawling in southern Brazil, was studied to assess the fishery effects on the stock through the estimation of the remaining spawning-potential ratio. Sampling was conducted throughout a year and included specimens to determine sex, maturity and age. Age was validated by the edge type and marginal-increment analysis. The oldest and the largest individuals were 9 years and 195 mm total length...
August 2, 2017: Journal of Fish Biology
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