Estimating abundance of pelagic fishes using gillnet catch data in data-limited fisheries: a Bayesian approach

2007 ◽  
Vol 64 (7) ◽  
pp. 1019-1033 ◽  
Author(s):  
Shane P Griffiths ◽  
Petra M Kuhnert ◽  
William N Venables ◽  
Stephen J.M Blaber
Keyword(s):  
Effective Area ◽  
Similar Species ◽  
Ecosystem Models ◽  
Tropical Regions ◽  
Catch Data ◽  
Pelagic Fishes ◽  
Abundance Estimates ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Ecosystem Based Fisheries Management

We describe a Bayesian modelling approach to estimate abundance and biomass of pelagic fishes from gillnet catches in data-limited situations. By making a number of simple assumptions, we use fish sustained swimming speed to calculate the effective area fished by a gillnet in a specified soak time to estimate abundance (fish·km–2) from the number of fish caught. We used catch data from various sampling methods in northern Australia and elicited anecdotal information from experts to build a size distribution of the true population to compensate for size classes that were unlikely to be represented in the catch because of size selectivity of the gear. Our final abundance estimates for various-sized scombrids (0.04–4.17 fish·km–2) and istiophorids (0.004–0.005 fish·km–2) were similar to what has been estimated for similar species in more data-rich situations in tropical regions of the Pacific Ocean. The model is particularly useful in data-limited situations in which abundance or biomass estimates are required for pelagic fish species of low economic importance. These data are often required for ecosystem models (e.g., Ecopath) that are increasingly being considered as potential tools for ecosystem-based fisheries management.

Taxonomy and biogeography of Molgolaimus Ditlevsen, 1921 (Nematoda: Chromadoria) with reference to the origins of deep sea nematodes

2006 ◽  
Vol 18 (1) ◽  
pp. 23-50 ◽  
Author(s):  
Gustavo Fonseca ◽  
Ann Vanreusel ◽  
Wilfrieda Decraemer
Keyword(s):  
Deep Sea ◽  
Tail Length ◽  
Species Level ◽  
Weddell Sea ◽  
Similar Species ◽  
Disturbed Areas ◽  
The Pacific ◽  
Morphometric Features ◽  
Total Community ◽  
The Pacific Ocean

Molgolaimus is a genus of free-living marine nematodes which is found in high densities (10–35% of the total community) up to 2000 m depth. Its occurrence is often associated with organically enriched and recently disturbed areas. Currently, only 16 species have been described, mainly from shallow waters. The present study contributes 17 new species mainly from the Weddell Sea but also from the Pacific Ocean, and provides an illustrated polytomous identification key to species level. The 33 Molgolaimus species described can be identified based on just a few morphometric features: spicule length, body length, anal body diameter, tail length and pharynx length. A first insight into the biogeography of this deep sea genus at species level is presented. A comparison of morphometric characteristics between species suggests that the most similar species co-occur in the same geographical region, rather than within the same bathymetric zones or similar ecosystems separated over long distances. These observations suggest that deep sea nematodes may not have a common origin but might have derived “recently” from shallow water taxa. Therefore, global distribution of nematodes could be explained by means of palaeogeographical events.

Description of two new species of munnopsid isopods (Crustacea: Isopoda: Asellota) from manganese nodules area of the Clarion-Clipperton Fracture Zone, Pacific Ocean

Zootaxa ◽  
2011 ◽  
Vol 2783 (1) ◽  
pp. 1 ◽  
Author(s):  
MARINA V. MALYUTINA
Keyword(s):  
New Species ◽  
Pacific Ocean ◽  
Fracture Zone ◽  
Similar Species ◽  
Manganese Nodules ◽  
The Pacific ◽  
Clipperton Fracture Zone ◽  
Two New Species ◽  
The Pacific Ocean ◽  
Clarion Clipperton Fracture Zone

Two new species of deep sea asellotes of the family Munnopsidae, Rectisura slavai sp. nov. and Storthyngura yuzhmorgeo sp. nov. are described from the manganese nodules area in the Clarion-Clipperton Fracture Zone of the Pacific Ocean. The discovery of these new species allowed re-examination of the taxonomic position of two similar species, Storthyngura ? intermedia (Beddard, 1885) from the Northeastern Basin of the Pacific Ocean and Ilyarachna defecta Menzies & George, 1972 from the Peru-Chile Trench, eastern Pacific Ocean. The species are moved to the genera Rectisura Malyutina, 2003 and Storthyngura Vanhöffen, 1914, respectively. Additional composition and distribution of the species of the genera are presented.

scholarly journals Hylocereus undatus (dragon fruit).

2020 ◽  
Author(s):  
Julissa Rojas-Sandoval ◽  
Andrew Praciak
Keyword(s):  
Invasive Weed ◽  
Tropical Regions ◽  
Fruit Crop ◽  
The Pacific ◽  
Dragon Fruit ◽  
Late Twentieth ◽  
The Pacific Ocean ◽  
Hylocereus Undatus ◽  
Black Seeds ◽  
Late Twentieth Century

Abstract Hylocereus undatus is a vine-like cactus that is often grown as a night-flowering ornamental plant and as a fruit crop. The fruit is highly decorative, with a bright red skin, studded with green scales. The flesh is white, juicy and delicious in flavour, with tiny black seeds. Its exact native range is uncertain but is considered to be in Central America. Since the late twentieth century it has been widely planted on a commercial scale as a fruit crop in many tropical regions, particularly in Vietnam and other South-East Asian countries, and has escaped widely from cultivation, become naturalized and in many instances become an invasive weed, sometimes threatening native plants and habitats. Currently it is listed as invasive in China, Australia, South Africa, Cuba, and on many islands in the Pacific Ocean (Oviedo Prieto et al., 2012; PIER, 2016 <datasheet/27317 >; Queensland Government, 2016 < datasheet/27317 >).

scholarly journals 411 PB 054 ORIGIN OF HORTICULTURE IN SOUTHEAST ASIA AND THE DISPERSAL OF DOMESTICATED PLANTS TO THE PACIFIC ISLANDS

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 489g-490
Author(s):  
Robert F. Bevacqua
Keyword(s):  
Southeast Asia ◽  
Pacific Islands ◽  
Fruit Crops ◽  
Important Food ◽  
Tropical Regions ◽  
The Pacific ◽  
Linguistic Evidence ◽  
Root Tuber ◽  
The Pacific Ocean ◽  
The Impact

Navigators from Southeast Asia began voyages of discovery into the Pacific Ocean four thousand years ago that resulted in the dispersal of an assemblage of domesticated plants that has come to dominate horticulture in the world's tropical regions. Archaeological, botanical, and linguistic evidence indicates the assemblage included coconut, banana, taro, yam, sugar cane, and other important food and fiber crops. An emerging view among scholars is that an origin of horticulture is associated with early Chinese civilization and that Southeast Asia was a center for the domestication of vegetatively propagated root, tuber, and fruit crops. This paper describes (1) an origin for horticulture in Southeast Asia, (2) the eastward dispersal of horticultural plants by voyagers, and (3) the impact of the introduction of horticulture on the natural enviroment of the Pacific Islands.

scholarly journals Inferring the depth distribution of catchability for pelagic fishes and correcting for variations in the depth of longline fishing gear

2005 ◽  
Vol 62 (5) ◽  
pp. 1130-1142 ◽  
Author(s):  
Peter Ward ◽  
Ransom A Myers
Keyword(s):  
Time Series ◽  
Depth Distribution ◽  
Fishing Gear ◽  
Commercial Catch ◽  
Additional Information ◽  
Pelagic Fishes ◽  
The Pacific ◽  
Abundance Indices ◽  
The Pacific Ocean ◽  
Catch Rates

We introduce a new method that uses generalized linear mixed models to infer the depth distribution of pelagic fishes. It uses existing data from research surveys and observers on commercial vessels to estimate changes in catchability when longline fishing gear is lengthened to access deeper water. We infer the depth distribution of catchability for 37 fish species that are caught on pelagic longlines in the Pacific Ocean. We show how the estimates of catchability can be used to correct abundance indices for variations in longline depth. Our method facilitates the inclusion of data from early surveys in the time series of commercial catch rates used to estimate abundance. It also resolves inconsistencies in the time series caused by a rapid switch to deep longlining in the 1970s. The catchability distribution does not always match depth preferences derived from tracking studies. Therefore, depth preferences from tracking studies should not be used to correct abundance indices without additional information on feeding behavior.

Mesosignum weddellensis sp. nov. (Crustacea: Asellota: Mesosignidae), a new isopod species from the abyssal Weddell Sea, Antarctica

Zootaxa ◽  
2004 ◽  
Vol 501 (1) ◽  
pp. 1
Author(s):  
MADHUMITA CHOUDHURY ◽  
ANGELIKA BRANDT
Keyword(s):  
Pacific Ocean ◽  
Southern Ocean ◽  
Weddell Sea ◽  
The Other ◽  
Similar Species ◽  
The Pacific ◽  
Significant Difference ◽  
The Pacific Ocean ◽  
Species Being

Mesosignum weddellensis sp. nov. is described from the abyssal Weddell Sea, Antarctica. This is the second record of Mesosignum from the Southern Ocean, the other known species being M. antarcticum Schultz, 1979. Mesosignum brevispinis Birstein, 1963 from the Pacific Ocean is the most similar species. The most significant difference is the length of the seventh pereonite, which is only half as long as the other pereonites in M. brevispinis, while in M. weddellensis it is as long as the other pereonites.

6.9 The use of green bananas and tropical crop residues for intensive beef production

1981 ◽  
Vol 4 ◽  
pp. 371-383
Author(s):  
M. E. Ruiz
Keyword(s):  
Latin America ◽  
Central America ◽  
Crop Residues ◽  
Heavy Rain ◽  
The Other ◽  
Tropical Zone ◽  
Tropical Regions ◽  
The Pacific ◽  
Tropical Crop ◽  
The Pacific Ocean

In tropical regions of Latin America, two general types of ecosystems, as applied to agriculture, may be identified: one is the dry/humid tropical zone, where a period of drought is followed by a period of heavy rain occurring, for example, on the Pacific Ocean Slope of Central America. The other ecosystem is the humid tropical zone, as found on the Atlantic Slope of Central America, where rain occurs every month, although not following an even distribution pattern.

scholarly journals Two new species of Acanthobothrium Blanchard, 1848 (Onchobothriidae) in Narcine entemedor Jordan & Starks, 1895 (Narcinidae) from Acapulco, Guerrero, Mexico

ZooKeys ◽  
2019 ◽  
Vol 852 ◽  
pp. 1-21 ◽  
Author(s):  
Francisco Zaragoza-Tapia ◽  
Griselda Pulido-Flores ◽  
Juan Violante-González ◽  
Scott Monks
Keyword(s):  
New Species ◽  
Pacific Coast ◽  
Similar Species ◽  
Spiral Intestine ◽  
Total Length ◽  
The Pacific ◽  
Two New Species ◽  
Identification Of Species ◽  
The Pacific Ocean ◽  
Accessory Sucker

Two species ofAcanthobothrium(Onchoproteocephalidea: Onchobothriidae) are described from the spiral intestine ofNarcineentemedorJordan &amp; Starks, 1895, in Bahía de Acapulco, Acapulco, Guerrero, Mexico. Based on the four criteria used for the identification of species ofAcanthobothrium,A.soniaesp. nov.is a Category 2 species (less than 15 mm in total length with less than 50 proglottids, less than 80 testes, and with the ovary asymmetrical in shape).Acanthobothriumvidalisp. nov.is a Category 6 species (more than 15 mm in total length with more than 50 proglottids, fewer than 80 testes, and the ovary is asymmetrical). The new species differ from similar species from the Pacific Ocean by total length, the number of proglottids, diameter of the accessory sucker, the length of the cirrus sac, the number of testes per proglottid and the measurements of hooks. With the recognition ofA.soniaesp. nov.andA.vidalisp. nov., 42 species ofAcanthobothriumhave been reported from the Pacific coast of the Americas. This is the first report of species ofAcanthobothriumfrom a member ofNarcinefrom Mexico and it brings the number of species reported from elasmobranchs from the Pacific Coast of Mexico to 13.

scholarly journals Four seasons abundance changes of Zalophus californianus californianus (Lesson 1828), Allen, 1880, in the Gulf of California, Mexico

2006 ◽  
Vol 49 (1) ◽  
pp. 111-116 ◽  
Author(s):  
M. Octavio Maravilla-Chávez ◽  
Alfredo Zavala-González ◽  
Alfredo Ortega-Rubio
Keyword(s):  
Relative Abundance ◽  
Gulf Of California ◽  
California Sea Lions ◽  
Sea Lions ◽  
Four Seasons ◽  
Abundance Estimates ◽  
The Pacific ◽  
Different Seasons ◽  
The Pacific Ocean ◽  
First Time

This paper describes for the first time the relative abundance, population structure and numeric variation of California sea lions in the Gulf of California, Mexico, during four different seasons. The relative abundance estimates varied from the highest 17,162 sea lions in July of 1990 (summer) to a minimum 7,470 in February of 1992 (winter), representing a reduction of 10,000 sea lions. Hypotheses about the migration of part of the population to the Pacific Ocean were compared and discussed against their residency inside the Gulf, and seasonal dispersion of individuals along this inner sea.

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