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The aim of this study is description of the reproductive characters of three species of deepwater caridean shrimps. Ovarian maturity staging and staging of embryos development in these species are described for the first time. Ovarian maturation, fecundity and eggs size, type of spawning and characteristics of embryos development integrally reflect reproductive patterns in Parapasiphae sulcatifrons, Acanthephyra pelagica and A. purpurea. All these species generally have K-strategy traits. However the two Acanthephyra spp. which live in shallower water layers and possess morphological plesiomorphies show K-strategy with important components of r-strategy (i.e. relatively large number of small but lecithotrophic larvae). P. sulcatifrons which is a bathypelagic species characterized by some apomorphies has extreme K-strategy traits and produces small numbers of large lecithotrophic larvae. РЕЗЮМЕ. Цель данной работы — описание репродуктивных характеристик трех видов глубоководных каридных креветок. Стадии зрелости яичников и стадии развития эмбрионов у этих трех видов описываются впервые. Созревание яичников, величина плодовитости и размер яиц, тип нереста и развитие эмбрионов интегрально отражают специфику воспроизводства Parapasiphae sulcatifrons, Acanthephyra pelagica и A. purpurea. Всем видам присущи, главным образом, черты К-стратегии. Однако, оба вида Acanthephyra, более мелководных и имеющих ряд морфологических плезиоморфий, демонстрируют К-стратегию с тенденцией к rстратегии (производят относительно большое количество лецитотрофных, но мелких личинок). Батипелагическая и характеризующаяся рядом апоморфий P. sulcatifrons имеет черты сильно выраженной К-стратегии с формированием небольшого количества крупных лецитотрофных личинок. Introduction Pelagic decapod shrimps often comprise a significant portion of biomass in midwater collections from the open ocean and play an appreciable role in the pelagic food web [Omori, 1974; Jamieson et al., 2009]. Despite a number of studies on the taxonomy and distribution of such pelagic shrimp species as Parapasiphae sulcatifrons Smith, 1884, Acanthephyra purpurea A. Milne-Edwards, 1881 and Acanthephyra pelagica Risso, 1816 [Vinogradov, 1968; Foxton, 1972; Crosnier, Forest, 1973; Hargreaves, 1984; Tchesunov, 1984; Kikuchi, Omori, 1985; Krygier, Wasmer, 1988; Hendrickx, Estrada Navarrete, 1989; Komai et al., 2000; Martin, 2003] there is still limited knowledge on their reproduction [Chace, 1940; Omori, 1974; Burukovsky, 1993, 1998; Burukovsky, Andreeva, 2011]. The aim of this paper is to describe traits of the reproductive system maturation (development of the primary and secondary sexual characters, maturation of ovaries), fecundity and embryos development in these deep-water species from the North Atlantic along the Mid-Atlantic Ridge from Iceland to the Azores and to discuss interspecific differences of their reproductive strategies. Maturation, fecundity and embryos development in three deep-water shrimps (Decapoda: Caridea: Pasiphaeidae, Oplophoridae) along the mid-Atlantic Ridge from Iceland to the Azores Ñîçðåâàíèå, ïëîäîâèòîñòü è ðàçâèòèå ýìáðèîíîâ ó òðåõ ãëóáîêîâîäíûõ êðåâåòîê (Decapoda: Caridea: Pasiphaeidae, Oplophoridae) ñî Ñðåäèííî-Àòëàíòè÷åñêîãî õðåáòà îò Èñëàíäèè äî Àçîðcêèõ îñòðîâîâ Svetlana A. Sudnik1, Tone Falkenhaug2 Ñ.À. Ñóäíèê1, Ò. Ôàëüêåíõîã2 1 Kaliningrad State Technical University, Sovietsky pr., 1, Kaliningrad, 236000 Russia. E-mail: lanasudnik@mail.ru Калининградский Государственный Технический Университет, Советский пр-т, Калининград, 236000 Россия. 2 Institute of Marine Research, Flødevigen, N-4817, His, Norway. E-mail: tone.falkenhaug@imr.no

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Maturation, fecundity and embryos development in three deep-water shrimps (Decapoda: Caridea: Pasiphaeidae, Oplophoridae) along the mid-Atlantic Ridge from Iceland to the Azores