|Scientific Name:||Hydrolagus matallanasi Soto & Vooren, 2004|
|Taxonomic Notes:||A recently described species, most closely-related to H. mirabilis (Soto and Vooren 2004).|
|Red List Category & Criteria:||Data Deficient ver 3.1|
|Reviewer(s):||Valenti, S.V. & Gibson, C.G. (Shark Red List Authority)|
Hydrolagus matallanasi is a little known and recently described holocephalan endemic to southern Brazil in the Southwest Atlantic. Presently known only from the upper continental shelf at depths of 416 to 736 m between Rio de Janeiro state (23°42'S) and Santa Catarina state (30°18'S). Brazil recently developed a deep-sea fishing program on the slope at depths of 200 to 900 m off southern Brazil. As such the entire geographical and much of the bathymetrical distribution of the species has been subject to a gillnet fishery for monkfish Lophius gastrophysus. Hydrolagus spp. (likely H. matallanasi) were recorded as a very minor discarded bycatch in that fishery. Furthermore, otter trawling and deepsea longlining (the latter restricted to >600 m) also operate within the species' area of occurrence. However, considerable management arrangements have recently been implemented in these fisheries which resulted in the ceasing of fishing by foreign vessels in 2002, a quota management and effort limitation system for domestic vessels and two no-fishing areas. The conservation status of this restricted-range species may rely heavily upon the success of these management arrangements. Full observer coverage onboard domestic vessels provide a real opportunity to collect future catch trend data. As such, this assessment should be updated as this data become available, while at this time, the very limited information available on the species precludes an assessment beyond Data Deficient.
|Range Description:||Endemic to the Southwest Atlantic to southern Brazil between Rio de Janeiro state (23°42'S) and Santa Catarina state (30°18'S) (Soto and Vooren 2004).|
|FAO Marine Fishing Areas:|
Atlantic – southwest
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||Presently known in the literature from only 21 specimens as specified in the original description (Soto and Vooren 2004).|
|Current Population Trend:||Unknown|
|Habitat and Ecology:||Recorded from the upper continental shelf at depths of 416 to 736 m, apparently from deep-reefs (Soto and Vooren 2004). Maximum size 30.2 cm precaudal length (PCL) for males and 37.8 cm PCL for females. Males mature at ~29.6 cm PCL (Soto and Vooren 2004). Nothing else known of its biology.|
|Major Threat(s):||In 1998 the Brazilian government initiated a deep-sea fishing program in order to remove some pressure from the shelf environment and explore unexploited resources on the slope (Perez et al. 2003). Fishing activities employing chartered foreign vessels began in 2000 using demersal gear, specifically longlines, otter trawls, gillnets and pots at depths of <200 to 900 m. Longlining was later (2001) restricted to depths >600 m (Perez et al. 2003). The gillnet fishery for monkfish Lophius gastrophysus which was developed as part of this deepwater fishing program, operated over the entire geographical, and much of the bathymetrical distribution of Hydrolagus matallanasi. Perez and Wahrlich (2005) surveyed bycatch in this fishery between 22°44´S and 34°21´S and at depths of 132 to 607 m, recording very low numbers (0.005 per 100 nets) of Hydrolagus sp. (likely H. matallanasi). This was a discarded species. A deepwater trawl fishery also operates in the same region, operating down to depths of 460 m (Perez et al. 2003). Foreign vessels were unauthorized to operate after October 2002 and a management plan implemented for the fishery (see Conservation Actions section below). These management arrangements should greatly reduce the level of impact on the species, but it will likely continue to be taken as bycatch.|
A management plan was developed for the gillnet monkfish fishery in 2002 and approved in June 2005. Foreign chartered fishing vessels were unauthorized to operate after October 2002 and an annual TAC of 1,500 t and an effort limitation of nine vessels implemented for the domestic fleet. Further management arrangements included a permanent VMS tracking system, 100% observer coverage, logbooks and a ban on fishing shallower than 250 m. Furthermore, two no-take zones were implemented, one in the southern and the other in the northern sections of the fishing area (Perez et al. 2002, Perez pers. comm). Given the restricted known distribution of H. matallanasi, the conservation status of this species may rely heavily upon the success of these management arrangements. Full observer coverage onboard domestic vessels provide an opportunity to accurately monitor catch levels and trends in the future.
The restriction of the southern Brazilian deepwater longline fishery to depths of >600 m places reduces its overlap with the known bathymetrical distribution of H. matallanasi.
|Citation:||Kyne, P.M. 2007. Hydrolagus matallanasi. The IUCN Red List of Threatened Species 2007: e.T63151A12623883.Downloaded on 23 June 2018.|
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