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Noguchi K.,Saga Prefectural Genkai Fisheries Research and Development Center | Maeda M.,University of Miyazaki
Mer | Year: 2010

This research has aimed for establishing the stable production of flat fish larvae in aquaculture, adopting a marine bacterium, EKZ-2 strain, isolated from the macro algae Ecklonia kurome zoospore, that mainly has the pathogen-static activities. When EKZ-2 strain was fed to flat fish juvenile, the increased body weight was observed. And also in situ the sur vival rates of flat fish larvae was improved using EKZ-2 strain in the aquaculture facility of mass production, where the larval mortality had been high because of the pathogenic Vibrio in fection.

Qiu X.,Kyushu University | Shimasaki Y.,Kyushu University | Yoshida Y.,Kyushu University | Yoshida Y.,Saga Prefectural Genkai Fisheries Research and Development Center | And 15 more authors.
Journal of the Faculty of Agriculture, Kyushu University | Year: 2014

We investigated the allelopathic effects of Skeletonema spp. on growth and interspecific competition of the co-occurring flagellates Akashiwo sanguinea, Chattonella spp., and Heterosigma akashiwo, by reviewing field data on fluctuations in their cell densities and through laboratory experiments. From 29 June to 3 September, 2007, three dense blooms were observed in the inner part of the Ariake Sea, Japan. In all the 4 stations, Skeletonema spp. were generally detected and contributed to blooms from 20 to 23 July and from 6 to 13 August. Chattonella spp. gradually grew from mid-July and formed mixed blooms with Skeletonema spp. from 6 to 13 August, and then caused an almost mono-specific bloom in the station 2 and 3 from 20 to 24 August. However, H. akashiwo and A. sanguinea generally maintained low cell densities. Laboratory experiments showed that when grown in re-enriched culture filtrates of Skeletonema sp. (NIES-324) and cultured with Skeletonema sp. under non-contact conditions, A sanguinea suffered the highest growth inhibitory effect, followed by H. akashiwo, while C. antiqua was the most resistant species. In tri-algal culture of these flagellates, the allelopathic effects of Skeletonema sp. increased the proportion of C. antiqua cells and decreased those of H. akashiwo and A. sanguinea, perhaps giving C. antiqua a competitive advantage over the other 2 flagellates. Our results suggest that allelopathy of Skeletonema spp. has potential to influence interspecific competition of these flagellates owing to species-specific growth inhibitory levels, and sometimes may be propitious to bloom formation of Chattonella spp. in the field.

Rodhouse P.G.K.,British Antarctic Survey | Pierce G.J.,University of Aberdeen | Pierce G.J.,University of Aveiro | Sauer W.,Rhodes University | And 49 more authors.
Reviews in Fisheries Science and Aquaculture | Year: 2015

Some 290 species of squids comprise the order Teuthida that belongs to the molluscan Class Cephalopoda. Of these, about 30-40 squid species have substantial commercial importance around the world. Squid fisheries make a rather small contribution to world landings from capture fisheries relative to that of fish, but the proportion has increased steadily over the last decade, with some signs of recent leveling off. The present overview describes all substantial squid fisheries around the globe. The main ecological and biological features of exploited stocks, and key aspects of fisheries management are presented for each commercial species of squid worldwide. The history and fishing methods used in squid fisheries are also described. Special attention has been paid to interactions between squid fisheries and marine ecosystems including the effects of fishing gear, the role of squid in ecosystem change induced by overfishing on groundfish, and ecosystem-based fishery management. Copyright © Taylor & Francis Group, LLC.

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