Length-weight relationships (LWR) and relative condition factor were described for species of deep-water crustaceans caught with bottom trawls in a depth range between 150 and 535 m during August and December of 2009, and March and May of 2010 in the Colombian Caribbean Sea. A linear regression was performed using the logarithmically transformed data to calculate the and coefficients of the LWR for 22 crustacean species corresponding to 13 families and 19 genera and three types of crustaceans (shrimp, crab, lobster). Six crustacean species showed a maximum total length greater than that reported in SeaLifeBase: (77.00 mm), (220.00 mm), (197.46 mm), (149.00 mm), (196.27 mm) and (240.00 mm). A total of 11 species (50.0%) exhibited isometric growth, five species (22.7%) negative allometric and six species (27.3%) positive allometric. This study shows the first estimates of LWR for 12 species of deep-water crustaceans in the Colombian Caribbean Sea. We demonstrate for the first time that the growth parameters (intercept and slope) of the LWR varying significantly as a function of the body shape of crabs, lobsters and shrimps in deep-water crustaceans.
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http://dx.doi.org/10.7717/peerj.16583 | DOI Listing |
Biology (Basel)
December 2024
Institute of Biology, Irkutsk State University, Irkutsk 664025, Russia.
Solar ultraviolet (UV) is among the most important ecological factors shaping the composition of biota on the planet's surface, including the upper layers of waterbodies. Inhabitants of dark environments recently evolving from surface organisms provide natural opportunities to study the evolutionary losses of UV adaptation mechanisms and better understand how those mechanisms function at the biochemical level. The ancient Lake Baikal is the only freshwater reservoir where deep-water fauna emerged, and its diverse endemic amphipods (Amphipoda, Crustacea) now inhabit the whole range from highly transparent littoral to dark depths of over 1600 m, which makes them a convenient model to study UV adaptation.
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January 2025
Institute for Marine Biological Resources and Biotechnology (IRBIM), National Research Council (CNR), Largo Fiera della Pesca 2, 60125, Ancona, Italy.
Sorting grids to exclude the juveniles of species targeted by bottom trawl fisheries from the catch are among the most promising solutions to reduce discards. We tested a two-sections Juveniles' Sorting Grid (JSG) in a Mediterranean fisheries restricted area. First, we provided information on the vitality of individuals escaping from the JSG bars during towing, by analysing underwater footage.
View Article and Find Full Text PDFZootaxa
August 2024
Department of Life Sciences; Natural History Museum; Cromwell Road; London SW7 5BD; UK.
Our ability to reconstruct the evolutionary history of deep-water scalpellid barnacles (Crustacea: Cirripedia: Scalpellidae) and to understand their geographical distributions and ecology, is limited by the lack of a robust classification system. Analysis of the ontogeny of scalpellids highlights the significant morphological changes that occur during development from the smallest, recently settled juveniles up to full-grown specimens. Externally, these ontogenetic alterations can include changes in size, shape, and in the capitulum/peduncle ratio, as well as changes in the shape of plates resulting from modifications in the patterns of calcification.
View Article and Find Full Text PDFFirst stage zoeas of the vent crab Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda, Brachyura, Bythograeidae) were collected by a remotely operated vehicle from the Kairei Hydrothermal Vent, Central Indian Ridge, in January 2016 during the INDEX2016 cruise of the French registered RV Pourquoi Pas? The zoeal appendages are illustrated using confocal laser scanning microscopy and described. A comparison between first stage zoeal morphology of Gandalfus yunohana (Takeda, Hashimoto & Ohta, 2000) and A. rodriguezensis is made and, although remarkably similar, they can be distinguished by dorsal pleonal spinulation.
View Article and Find Full Text PDFZootaxa
June 2024
Laboratorio de Crustáceos; Facultad de Estudios Superiores Iztacala; Universidad Nacional Autónoma de México; Avenida de Los Barrios 1; Los Reyes Iztacala; Tlalnepantla; Estado de México; C.P. 54090; México.
A new monotypic genus of eusirid amphipod, Pseudorhachotropis gen. nov., is described and illustrated from a male specimen collected from bathyal soft bottoms (2321 m depth) in the southern Gulf of Mexico.
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