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| Registros recuperados: 148 | |
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| Heral, Maurice; Woehrling, Daniel; Halgand, Daniel; Lassus, Patrick. |
| The "Bongo" net is an American plankton net whose use is coming into general use for studies of ichthyoplankton. Its dimensions and its power of filtration make it an efficient device for researching groups with unevenly spaced micro distribution as well as rare species, especially fish eggs and larvae. It is recommended by the ICNAF (Standard Techniques for Pelagic Fish Eggs and Larvae Surveys) and will soon be recommended by the FAO. The ISTPM, for its part, has been using this net for some years in several campaigns conducted by the Thalassa, the Cryos, La Pélagia, the Roselys and the Ichthys (ISTPM 1971, 1975, ALDEBERT 1975, ARBAULT and LACROIX 1975). In 1975, we decided to use this net in some studies in coastal waters that the ISTPM is conducting in... |
| Tipo: Text |
Palavras-chave: Traitement échantillon; Profondeur immersion; Pêche; Echantillonneur; Filet à plancton. |
| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/1979/acte-2991.pdf |
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| Heral, Maurice. |
| Le filet Bongo est un filet à plancton américain dont l'utilisation se généralise pour les études de l'lchtyoplancton. Ses dimensions, son pouvoir de filtration et son rendement en fait un engin performant pour la recherche des larves de poissons. Il est recommandé par l'I.G.N.A.F. groupe pré-recrutement du hareng et il le sera prochainement dans F.A.O. standard Techniques for Pelagic Fish Egg and Larva Sarveys. L' ISTPM utilise ce filet, depuis 1971 , dans de nombreuses campagnes à bord de la Thallassa, du Cryos, de la Pelagia , du Roselys et de Ichtys. En 1975, nous avons décidé d'utiliser ce filet dans des études côtières que l'ISTPM mène en Manohe et en Mer du Nord. Ces travaux ont pour but d'établir un inventaire halieutique qualitatif et quantitatif... |
| Tipo: Text |
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| Ano: 1975 |
URL: http://archimer.ifremer.fr/doc/00387/49875/50433.pdf |
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| Heral, Maurice; Berthome, Jean-paul. |
| The impact of the main parameters of water quality which act on the life history of molluscs are presented. Two types of parameters are examined: the first are the physical-chemical parameters as temperature, salinity, turbidity, oxygen concentrations. They can be modified by perturbations directly related to human activities such as management of physical operations, e.g. constructions of dams, dredging for channels or for extraction of materials. Particular attention is given to inputs of nutrients with as consequences eutrophication and depletion of oxygen causing anoxie conditions. Attention will he focussed on some phytoplankton species like Gyrodinium aurelum which can cause mortalities in mollusc shellfish. The action of the main pollutants... |
| Tipo: Text |
Palavras-chave: Networks; Monitoring; Water quality; Molluscs culture. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/1991/publication-3056.pdf |
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| Heral, Maurice. |
| In areas where oyster or mussel culture is very intensive, declines of growth rate and decreases of survival rate have occurred. For these reasons, plans have been proposed to regulate the cultivated biomasses in order to fit the carrying capacity of the different ecosystems (Heral et al 1990; Heral, 1991). In areas where new aquaculture of molluscs is beginning, oyster or mussel farmers need to know how large the extension of the culture could be and what the maximal densities should be in order to obtain the maximum economic benefit. Furthermore, as mollusc cultures are developed in coastal areas, they are very susceptible to changes in environmental conditions that can modify trophic relationships, or directly reduce growth rate, physiological... |
| Tipo: Text |
Palavras-chave: Oyster model; Analytical model; Bivalve molluscs culture; Models. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/1993/publication-6104.PDF |
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| Registros recuperados: 148 | |
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