Johnson, T. R., and van Densen, W. L. T. 2007. The benefits and organization of cooperative research for fisheries management. – ICES Journal of Marine Science, 64: 834–840. Drawing on research in the northeastern USA and northwestern Europe, a description is given of how cooperative research is organized and a statement made of how involving fishers in research can contribute to better fisheries management. The focus is on improving stock assessments through the collection of better fishery-dependent and -independent data and through efforts to address bycatch through gear-selectivity studies. Direct benefits of cooperative research include increased quantity and quality of data, inclusion of fishers' knowledge in science and management, improved relevance of research to fisheries management, and reduced costs of science. Indirect benefits are the buy-in of science and management by industry and improved relationships and trust between fishers and scientists (and managers). These indirect benefits are best achieved under conditions of transparency and communication. In some cases, cooperative research also provides income to the industry and supports the maintenance of fishing infrastructure. Most important, cooperative research improves capacity-building and establishes intellectual property rights within the fishing industry, and it encourages innovative approaches to management, such as adaptive and ecosystem-based approaches. Finally, guidelines for making cooperative research more effective are outlined.
The suitability of rehabilitated floodplains along the lower River Rhine for rheophilic cyprinids was assessed by investigating the spatial distribution of 0-group fish among, and within, three newly created secondary channels, an oxbow lake reconnected at its downstream end and several existing groyne fields. Fish were sampled during April through September 1997-1999 with seine nets and trawls and, for each sample, the habitat (physical environment) was characterized (flow, depth, substrate and inundated terrestrial vegetation). The new water bodies provide more suitable habitats for 0-group fish than the groyne fields. Their beneficial value differs, however, between reproductive guilds and depends on the morphological and hydrological conditions. Total fish density increased along a gradient of decreasing water flow whereas the proportion of rheophilic species (Barbus barbus, Gobio gobio, Leuciscus idus and Aspius aspius) decreased. Flow velocity and water depth were the most important factors determining habitat utilization. Rheophilic fish were spatially separated from eurytopic fish (e.g. Abramis brama, Rutilus rutilus and Stizostedion lucioperca). During flood events, inundated terrestrial vegetation was an important habitat for the larvae of all species. To enhance the riverine fish community, floodplain water bodies should have complex shorelines, and a high variability of flow velocities. Their slopes should be moderate to maximize the probability of terrestrial vegetation getting inundated during spring and summer. Future management of similar floodplains should focus on more diverse and accessible aquatic habitats to increase overall fish species diversity, since different types of water body clearly have complementary values.
Spatial and temporal patterns in catch rates and in allocation of fishing effort were analysed for the coastal fishery in Spermonde Archipelago, Indonesia, to assess whether fishermen can optimise their strategy from catch information, or whether they fish under great uncertainty and merely minimise risks. On average 517 fishing units operated in the 2800 km2 area, catching 21 t fish day−1. Major gear categories were hook and line (59% of total effort and 5% of total catch), and lift nets (16% of total effort and 70% of total catch). The size of individual resource spaces varied with gear type and was smaller in unfavourable weather conditions. Although spatial patterns in catch rates at the scale of the whole archipelago were evident, fishermen could not differentiate between locations, as catch variance within their individual resource spaces was high relative to the contrasts in spatial patterns. The aggregated distribution of fishing effort in Spermonde must be explained by factors such as the small scale of operations, rather than fish abundance.
Durin an eight years period the onset and development of piscivory of O+ pikeperch was studied in the naturafienvironment of a shallow, eutrophic Dutch lake.In some ears the piscivory started as early as halfway June at a pikeperch size of circa 20 mm. The O+ ikeperci predated mainly on the smaller O+ smelt because these were the most slender preyfish avaifable. The O+ ikeperch is less and the O+ perch is much less available because of their larger circumference. Sm$O+ bream and roach became only available when their growth was retarded. The positive1 skewed size distribution of the O+ pikeperch halfway June is recursory for the development of girnodalitg in the size distribution later in the season. A seconcfmodus of larger, piscivorous, O+ pikeperch ecame relatively important in years when smelt was abundant. The surv~val rate of this category was appearantly higher than that of the smaller planktivorous individuals. ZusammenfassungNahrungswabl und bimodale Liingenverteilung in der 0-Gruppe vom Zander (Stizostedion lnciopercu L.)In einem flachen eutrophen, niederlindischen See wurde iiber 8 Jahre die Entwicklung der Zander des 1. Lebensjahres (Agr. 0+) zum Raubfisch untersucht.In mehreren Jahren begann die Umstellung von der E m a r u n g aus Planktonkrebsen auf Fischnahrung bereits Mitte Juni be1 einer Linge der Zander von etwa 20 mm. Die Nahrung dieser Jungfische bestand hauptsachlich aus den kleinen und schlanken Stinten der O+ Gruppe. Der Zander kann im ersten Lebensjahr andere Fische der 0-Grup e wie Artgenossen, Barsche, Brassen und Plotzen erst dann fressen, wenn diese im Wachstum zurdgeblieben sind.Die bimodale L&genverteilung in der 0-Gruppe der Zander bildet sich aus einer ab Mitte Juni auftretenden, ositiven Schiefe heraus. Besonders in Jahren mit massenhaften Vorkommen von Stinten den Kategorie war die Uberlebensrate deut ich hoher, als bei den kfeineren Zandern der Altersgruppe, die sich von Zooplanktern ernahrten.warder Gipfe P , der vonden Vorwiichsern qebildet wurde, sehr aus epragt. Innerhalb der fischfressen- ResumePiscivorie et diveloppement de bimodaliti dans la distribution de taille du sandre O+ (Stizostedion lucioperca L.) Pendant une periode de huit annees on a etudie le debut et le developpement de piscivorie du sandre O+ dans le milieu nature1 d'un lac hollandais peu profond et eutrophique. I1 y avaient des annies que la piscivorie du sandre commengait d6jh en mi-juin h une taille d'environ 20 mm. Le sandre O+ se nourissat surtout d'Cperlan O f plus petit, parce que celui-ci Ctait le Poisson de proie le plus disponible. Le sandre O+ est moins et la perche O+ est encore plus moins disponible h cause de leur plus grande U.S. Copyright Clearance Center Code Statement: 0175-8659/85/0103-O119 $02.5010 Z. angew. Ichthyol. 3 (1985) 119-131 0 1985 Verlag Paul Parey, Hamburg und Berlin ISSN a1 7~~~5 9 120 W . L. T. van Densen circonference. La petite brtme O+ et le petit gardon O+ devenaient seulement disponibles lorsque leur croissance ttait reiardCe. ui est en mi-juin positivement oblique, ap...
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