Preliminary observations on abundance and distribution of fish fauna in a canyon of the Bay of Biscay (ICES Division 8c)

Author(s):  
G. Diez ◽  
L. Arregi ◽  
M. Basterretxea ◽  
E. Cuende ◽  
I. Oyarzabal

Abstract The changes in abundance and biodiversity of deep-sea fish fauna are described based on an annual deep-water longline survey with data collected during the period 2015–2019 in the Basque Country continental Slope (ICES Division 8c). The sampling scheme included hauls in four 400 m strata, from 650–2250 m deep. The DST sensors installed in the main line have allowed us to set an accurate soak time for each haul, and they were used to calculate fishing effort and CPUE by haul. The catchability of the fishing gear indicated that 15% of the total hooks deployed in the five-year period were able to fish, and that the bottom longline was very effective in fishing a wide number of different species in all depth ranges. The fishing gear caught 14 different species of sharks (13 deepwater and one pelagic), two chimaeras and nine teleosts. The abundance and biomass registered on the hooks attached to the bottom were between three and four times higher than in the floating sections, and the highest CPUE and biomass were recorded between 1051–1450 m, from 2015 to 2017, and in the 1451–1850 m strata, but they do not show any clear trend throughout the five years of the series.

2020 ◽  
Vol 14 (6) ◽  
pp. 2049-2068
Author(s):  
Cikwanine Kasigwa ◽  
Joseph Matunguru ◽  
Nshombo Muderhwa ◽  
Jonas Jariekonga ◽  
Alidor Kankonda ◽  
...  

Une étude socio-économique a été conduite sur 602 pêcheurs répartis dans 16 camps de pêche dans la partie sud-ouest du lac Albert dans le but d’évaluer les activités des pêcheries. Dans chaque camp, les engins de pêche ont été identifiés, caractérisés et dénombrés ; et la composition des captures de poisson évaluée par type d’engin. 8 engins de pêche ont été identifiés, y compris des engins prohibés selon la réglementation de 2016, notamment le filet monofilament et les nasses. La palangre (1343,64 ± 832,5 m), le filet dormant de fond (1053,05 ± 520 m) et le filet dormant de surface (766,26 ± 536 m) ont été les plus utilisés. La senne de tournante était identifiée comme l’engin le plus productif, avec 183,18 ± 49,02 kg/jour pendant la bonne période et 20,89 ± 12,94 kg/jour pendant la mauvaise période), mais elle a été aussi la moins sélective de tous les engins identifiés. La pêche au filet dormant a donné une production journalière d’environ 62,7 kg en moyenne pendant la bonne période et de 10 kg pendant la mauvaise. L’occupation des zones de frayère, l’augmentation de l’effort de pêche, et l’utilisation des engins prohibés étaient considérées comme causes majeures de la baisse de productivité du lac Albert. Il demeure urgent d’appliquer la réglementation afin de protéger l’ichtyofaune du lac. Mots clés : Organisation, pêcheries, Sud-Ouest, lac Albert.   English Title: Socio-economic study of fisheries in the southwest part of Lake Albert (Ituri, DR Congo)A socio-economic study was conducted on 602 fishermen in 16 fishing camps in the southwestern part of Lake Albert in order to assess the activities of the fisheries. In each camp, the fishing gear was identified, characterized and counted; and the composition of fish catches assessed by gear type. 8 fishing gear have been identified, including gear prohibited under the 2016 regulations, notably the monofilament net and the nets. The length (1343.64 ± 832.5 m), the bottom fixed net (1053.05 ± 520 m) and the surface fixed net (766.26 ± 536 m) were the most used. The purse seine was identified as the most productive gear, with 183.18 ± 49.02 kg / day during the good period and 20.89 ± 12.94 kg / day during the bad period), but it was also the least selective of all the gear identified. The dormant net fishery gave an average daily production of around 62.7 kg during the good period and 10 kg during the bad period. The occupation of the spawning grounds, the increase in fishing effort, and the use of prohibited gear were considered as major causes of the decline in productivity of Lake Albert. There remains an urgent need to enforce regulations to protect the lake's fish fauna. Keywords: Organization, fisheries, Southwest, Lake Albert.


2020 ◽  
Vol 18 (3) ◽  
Author(s):  
Alex Garcia Cavalleiro de Macedo Klautau ◽  
Israel Hidenburgo Aniceto Cintra ◽  
Matheus Marcos Rotundo ◽  
Alfredo Carvalho-Filho ◽  
Rodrigo Antunes Caires ◽  
...  

Abstract Data on the deep sea fishes found off the northern Brazilian coast are restricted to the results of the surveys of the RV Oregon, a research vessel of the North American National Marine Fisheries Service, and the REVIZEE Program. The REVIZEE Score-Norte Program focused on commercial fish species and natural resources with potential for exploitation on the continental shelf and slope off the northern coast of Brazil. In this sense, the REVIZEE Score-Norte Program generated little information on species of no commercial value, did not catalog its inventory in zoological collections, and did not publish species lists. Given this considerable knowledge gap on the deep-sea fish found off the North coast of Brazil, we compiled all the available data on the deep-sea fish of this region and also retrieved photographic records from the REVIZEE Score-Norte Program, including the PRODEMERSAL and PROTUNA projects. Considering the published records, specimens deposited in zoological collections, and the interpretation of photographic records, we compiled a list of 63 species of deep-sea fish from the North coast of Brazil. An additional 30 species were found in the published records from the PRODEMERSAL and PROTUNA, but were considered to be doubtful or pending confirmation.


PLoS ONE ◽  
2012 ◽  
Vol 7 (9) ◽  
pp. e44509 ◽  
Author(s):  
Gianfranco D'Onghia ◽  
Porzia Maiorano ◽  
Roberto Carlucci ◽  
Francesca Capezzuto ◽  
Angela Carluccio ◽  
...  

2003 ◽  
Vol 31 ◽  
pp. 19-33 ◽  
Author(s):  
S M Powell ◽  
R L Haedrich ◽  
J D McEachran

Author(s):  
Les Watling ◽  
Lissette Victorero ◽  
Jeffrey Drazen ◽  
Matthew Gianni

Deep-sea fisheries occur at depths between 200 and 1800 m, using bottom trawls, long lines, and occasionally pots and gillnets. These fisheries were of minor interest and value until the mid-1980s when large stocks of fish were discovered, mostly on high-seas seamounts. However, because of the life-history characteristics of deep-dwelling fish, most seamount fish stocks were soon overfished, and few have recovered. Total deep-sea fish catch since 1950 represents about 3 per cent of the global catch, yet the environmental harm caused to deep-sea bottom communities by bottom trawling is extensive and long lasting, far exceeding the value of the fishery. In response, the United Nations has passed several resolutions since 2004 requiring the establishment of regional fisheries management organisations (RFMOs) who would be responsible for setting catch limits for the target species and requiring actions that would limit the damage to the habitat by fishing gear. To date, the latter of these two requirements, at least, has not been successfully met.


2021 ◽  
Vol 9 (11) ◽  
pp. 1294
Author(s):  
Keita Koeda ◽  
Soutarou Takashima ◽  
Takehisa Yamakita ◽  
Shinji Tsuchida ◽  
Yoshihiro Fujiwara

Several volcanic islands and submarine volcanoes exist in the sea connecting the Izu-Bonin Islands with the Mariana Islands, with trenches and islands formed by the submergence of the Pacific Plate under the Philippine Sea Plate. Although designated as a Marine Protected Area (MPA) in December 2020, the seamounts’ biodiversity has not been sufficiently researched. Therefore, direct observations and specimen sampling were conducted on four seamounts in this area using a remotely operated vehicle (ROV), autonomous underwater vehicle (AUV), and baited cameras (BCs). The ROV survey was conducted for 2–4 days on each seamount and divided into shallow and deep areas. During the expedition, 20 orders and 51 families of 81 deep-sea fish species were observed, including several potentially undescribed species, new genus or species records from Japanese waters, new depth records, new ecological information, and several rare fishes. The fish fauna and biodiversity abundance clearly differed among the seamounts; the seamount with a hydrothermal vent had the lowest diversity among the four seamounts. In shallow water, 23, 7, and 12 species were recorded only by ROV, AUV, and BC, respectively, indicating that combining these methods is beneficial for understanding the fish fauna of seamounts.


2018 ◽  
Vol 592 ◽  
pp. 225-242 ◽  
Author(s):  
E Cruz-Acevedo ◽  
N Tolimieri ◽  
H Aguirre-Villaseñor

Biology ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 522
Author(s):  
Régis Santos ◽  
Wendell Medeiros-Leal ◽  
Osman Crespo ◽  
Ana Novoa-Pabon ◽  
Mário Pinho

With the commercial fishery expansion to deeper waters, some vulnerable deep-sea species have been increasingly captured. To reduce the fishing impacts on these species, exploitation and management must be based on detailed and precise information about their biology. The common mora Mora moro has become the main deep-sea species caught by longliners in the Northeast Atlantic at depths between 600 and 1200 m. In the Azores, landings have more than doubled from the early 2000s to recent years. Despite its growing importance, its life history and population structure are poorly understood, and the current stock status has not been assessed. To better determine its distribution, biology, and long-term changes in abundance and size composition, this study analyzed a fishery-dependent and survey time series from the Azores. M. moro was found on mud and rock bottoms at depths below 300 m. A larger–deeper trend was observed, and females were larger and more abundant than males. The reproductive season took place from August to February. Abundance indices and mean sizes in the catch were marked by changes in fishing fleet operational behavior. M. moro is considered vulnerable to overfishing because it exhibits a long life span, a large size, slow growth, and a low natural mortality.


Author(s):  
Fabio C. De Leo ◽  
Jeffrey C. Drazen ◽  
Eric W. Vetter ◽  
Ashley A. Rowden ◽  
Craig R. Smith

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