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Catch fluctuation

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Journal Article
Aquatic Ecosystem Health & Management (2008) 11 (2): 212–224.
Published: 06 June 2008
... fluctuations have been significant, making identification of trends of the short time series difficult. Figure 2. Shrimp catch rates by fleet and quarter. Although presented as quarterly averages, the catch rate time series show indications of seasonal variation. The catch rates tend...
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Journal Article
Aquatic Ecosystem Health & Management (2010) 13 (2): 196–202.
Published: 28 May 2010
... fishery catches, and its importance to the composition of the diet of Nile perch ( Lates niloticus L .), and to the bottom trawl catches, were investigated. From August 2006 to January 2007, the mean C. nilotica CPUE was 1.68 ± 1.20 kg boat −1 day −1 at Kijiweni and Igombe, and its 0.37% contribution...
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Journal Article
Aquatic Ecosystem Health & Management (2007) 10 (4): 449–457.
Published: 28 November 2007
... independent data from bottom trawl surveys and fisheries dependent data from catch assessment and frame surveys were used. Current exploitation levels and practices are analysed and linked to growth, mortality and reproductive characteristics of the stock. Abundance estimates and distribution patterns...
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Journal Article
Aquatic Ecosystem Health & Management (2017) 20 (1-2): 130–139.
Published: 03 April 2017
... River system. The annual fish catch of Hilsa from the Bhagirathi–Hooghly River has fluctuated over the years ranging between 12,733 and 20,000 t between 2000–2001 and 2010–2012. The monsoon migration of Hilsa commences in July and gradually picks up in August. From September onwards, the magnitude...
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Journal Article
Aquatic Ecosystem Health & Management (2008) 11 (1): 29–35.
Published: 10 March 2008
... should be geared towards preventing the use of beach seines and small meshed nets subsequently ensuring a sustainable utilization of the pelagic fish resources. Copyright © AEHMS 2008 Catch fluctuation Stolothrissa tanganicae Lates stappersii clupeids Lake Tanganyika's pelagic fish...
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Journal Article
Aquatic Ecosystem Health & Management (2014) 17 (1): 25–33.
Published: 02 January 2014
... 12.82 0.01 Small cyclopoids 0.00 0.03 0.30 0.60 Copepod nauplii 0.14 0.49 9.43 0.01 The monthly catches of clupeids fluctuated over the period of our study, with peaks in July and October 2007 and April–May 2008, mainly determined by the catches of S. tanganicae ( Figure 1c...
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Journal Article
Aquatic Ecosystem Health & Management (2015) 18 (2): 134–148.
Published: 03 April 2015
... administrative levels. The total official catch fluctuates from 2700 to 3450 t, of which up to 65–70% is Omul. Another 20–25% is Roach. The total catch of all other species does not exceed several tens of tonnes. Expert estimates of illegal catches, at the same time, are put at about 700 t. Hatchery...
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Journal Article
Aquatic Ecosystem Health & Management (2015) 18 (2): 171–183.
Published: 03 April 2015
... of zooplankton in the Middle Caspian is formed by only one species, the non-indigenous Acartia tonsa Dana, 1846. Planktivorous fishes (Kilkas and Shads) represent the next link in the food chain. The influence of the invader was clearly detectable in the long-term catch data for Anchovy Kilka yearlings...
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Journal Article
Aquatic Ecosystem Health & Management (2014) 17 (4): 349–356.
Published: 02 October 2014
... depth). Trawl catches were identified to species and individually measured for total length. When trawl catches of individual species were very large (more than ca. 500 individuals of a certain species) a random subsample of 200 juveniles and 300 adults instead were measured per each trawl haul...
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Journal Article
Aquatic Ecosystem Health & Management (2018) 21 (2): 195–200.
Published: 03 April 2018
... ; Reynolds et al., 1999 ; Mölsä et al., 1999 ; Van Zwieten et al., 2002 ; FAO, 2006 ; LTA, 2012 b) when the artisanal fisheries started to develop (Van Zwieten et al., 2002 ; Mölsä et al., 2005 ). Eventually, the industrial catch rates diminished and gradually the fleet was transferred to the southern...
Journal Article
Aquatic Ecosystem Health & Management (2016) 19 (4): 401–410.
Published: 01 October 2016
... in Lake Tanganyika feed essentially on copepod with preference for larger organisms (e.g. T. simplex , M. aequatorialis or T. oblongatus ) when available (Mannini et al., 1996 ; Sarvala et al., 2002 ). So, the monthly catches of clupeids are known to fluctuate with cohort peaks shortly originated...
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Journal Article
Aquatic Ecosystem Health & Management (2017) 20 (1-2): 151–159.
Published: 03 April 2017
.... Karamchandani et al. ( 1967 ) reported the production of the species to fluctuate between 5.7 and 9.6 metric tons, sharing 25.5–29.6% of the total catch during 1958–1966 at a landing station (Shahganj) in Madhya Pradesh, indicating the abundance during the pre-impoundment period. Physical barriers due...
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Journal Article
Aquatic Ecosystem Health & Management (2013) 16 (4): 465–472.
Published: 01 October 2013
... Harvesting period Round the year Round the year October to January and March to June Arrangements for fisheries requisites Individual/Shared Self + Contractor Co-operative Time and mode of Payment In cash on the day of disposal of catch Daily/Weekly/ Monthly, in cash Daily/Weekly in cash...
Includes: Supplementary data
Journal Article
Aquatic Ecosystem Health & Management (2006) 9 (2): 215–226.
Published: 01 July 2006
... as coastal, and those beyond that as deep sea or offshore. The resources in these grounds can be further categorised as demersal and pelagic. Demersal catch revolves around a multitude of species, none of which are individually dominant. On the other hand, though the pelagic species count is much smaller...
Journal Article
Aquatic Ecosystem Health & Management (2007) 10 (4): 381–391.
Published: 28 November 2007
..., Dar-es-Salaam, Tanzania, per. obs.). The appearance of haplochromine cichlids in the R. argentea catches at Igombe beach started in 1997 and fluctuated with an increasing trend up to the present level ( Table 4 ). The same trend was found at Nyamikoma beach in the Speke Gulf (Y. Budeba, personal...
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Journal Article
Aquatic Ecosystem Health & Management (2010) 13 (3): 241–254.
Published: 31 August 2010
... is harvested for food by industrial and artisanal fisheries. In Malawi, the total biomass of the catch from these two sectors has been stable since the mid 1980s, fluctuating around 31,000 t y −1 ,  80% of which is landed by the artisanal sector ( Weyl, 2003 ). The artisanal sector comprises many highly...
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Journal Article
Aquatic Ecosystem Health & Management (2017) 20 (1-2): 140–150.
Published: 03 April 2017
... in the Brahmaputra basin in Assam, where a higher percentage of catch comprised of indigenous fish species with lower fish yield was noted in the open wetland. Copyright © 2017 AEHMS 2017 phosphorous cycling enzymes β Glucosidase organic matter water quality variables macrozoobenthos fish catch...
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Journal Article
Aquatic Ecosystem Health & Management (2019) 22 (2): 108–130.
Published: 03 April 2019
..., concentration of dissolved oxygen, nitrates, phosphates, chlorophyll- a , net primary production, phytoplankton, zooplankton biomass, fish larvae abundance, small and large pelagic fish catches) were compared between regions. In Sea of Oman, high concentrations of chlorophyll- a were associated with relatively...
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Journal Article
Aquatic Ecosystem Health & Management (2016) 19 (4): 327–335.
Published: 01 October 2016
...., 2011 ). In Lake Tanganyika, climate warming decreased primary productivity by 20% and fisheries yield by 30% (O’Reilly et al., 2003 ), although this was later contested by Sarvala et al., ( 2006 ). The decline in the catch per unit effort of Kapenta Limnothrissa miodon (Boulenger, 1906) in Lake...
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Journal Article
Aquatic Ecosystem Health & Management (2005) 8 (2): 175–184.
Published: 01 April 2005
... and results from earlier investigations have qualified this area as a reference site. Figure 1. The location of the study area including the sampling sites at the islands Florön and Musön. 1989–1996: catches at Florön and Musön; 1997–2001: catches at Musön. The eelpout ( Zoarces viviparus...
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