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SeveralVibrio spp. cause disease in marine fish populations, both wild and cultured. The most common disease, vibriosis, is caused byV. anguillarum. However, increase in the intensity of mariculture, combined wit...
A number of diseases affecting lobsters (shell disease, fungal infections and a few selected parasitic occurrences) are described and have been discussed briefly. The bacterial disease, gaffkemia, is described...
Diseases of echinoderms are poorly documented. Most reports concern biotic diseases caused by animal agents. While parasites on echinoderms have been described in increasing numbers of papers for more than one...
The impact of larval trematodes on the fauna of a North Sea tidal flat is considered at the individual and at the population level, depicting the digenean parasites of the common periwinkle,Littorina littorea, an...
Despite growing concern about the demise of coral reefs in many areas of the world, few studies have investigated the possibility that bacteria- or virus-caused diseases may be important agents in the disappea...
Approximately 40 viruses are known from marine sponges; turbellarian and monogenetic flatworms; cephalopod, bivalve, and gastropod mollusks; nereid polychaetes; and isopod and decapod crustaceans. Most of the ...
Periwinkles, as typical inhabitants of sea-shores, are subjected to extreme changes of environmental conditions, which affect their excretion. InLittorina littorea uric acid, urea and ammonium were detected parti...
On Helgoland (North Sea), the imagines ofClunio emerge during two seasonal periods (late spring and summer) from water temperatures of 8°–18 °C. The temperature dependence of the known semilunar eclosion rhythm o...
Phytoplankton blooms have attracted attention since times of old, especially the red tides caused by peridinians. Observed in all regions of the world, red tides occur predominantly in the warmer seas (e. g. W...
The results of phage-host cross-reaction tests reported by Moebus & Nattkemper (1981) were re-examined using serially diluted bacteriophage suspensions to elicit the actual type of reaction between the bacteri...
Based on 28 criteria the taxonomy of 366 phage sensitive bacterial strains isolated from marine waters (Atlantic between European continental shelf and Sargasso Sea, Bay of Biscay, North Sea near Helgoland) wa...
The analyses of density fields, nitrate and chlorophyll α concentrations, Lagrangian current measurements and remote sensing of sea surface temperatures demonstrated an island mixing effect for Monhegan Island...
The water-conducting system ofHalichondria panicea (Pallas) shows the classical eurypylous type. The excurrent system consists of a multiple anastomosing network of channels, within which numerous flagellated cha...
Social behaviour and spawning of adultBlennius pavo kept in the laboratory are described. Eggs are deposited in batches on the walls of artificial spawning places (PVC pipes). One male guards and tends the eggs o...
276 specimens of Atlantic cod (Gadus morhua L.) were caught during spawning in a restricted area of the Trondheimsfjord, Norway, in April and May 1979. Genotypes at the polymorphic haemoglobin locusHbl differed s...
The activity of Na-K-ATPase was determined in the posterior gills of the shore crabCarcinus maenas during a period following transfer from 35 to 10 ‰ salinity and vice versa at 15 °C. After transfer from high to ...
Moult cycle and morphogenesis in larval instars (zoea I, zoea II, megalopa) of the spider crabHyas araneus (L.) were studied in the laboratory. Changes in the epidermis and cuticle were documented photographicall...
The macrobenthic fauna associated withFucus at a station in the Kiel Fjord was investigated from June 1978 until June 1979. The predominant group in number as well as in biomass were gammarids. They formed, toget...
The life cycle of the Cubozoa is unique due to the complete metamorphosis of the sessible solitary polyp into one single medusa which starts a pelagic way of life. Contrary to the other metagenetic classes of ...
The reproductive cycle of aMytilus edulis population in the lower tidal zone at the island of Helgoland from Spring 1980 to Summer 1981 is described. In both years the spawning period extended from the end of Apr...
The morphology and ultrastructure of the two interstitial marine tubificidsPhallodrilus prostatus andAktedrilus monospermathecus (Oligochaeta), closely related to the gutlessPhallodrilus spp., is described. Since...
Caudal regeneration was investigated in decerebrateAnaitides mucosa and in brain-intact individuals. Both groups show an identical capacity to regenerate lost caudal segments. Furthermore there is no difference i...
The conditions for moult of the upper jaw ofOphryotrocha puerilis were determined in isolated individuals and in groups of various sizes. The frequency of formation of the complicated upper jaw in both isolated i...
Pairs and larger groups of femaleOphryotrocha puerilis puerilis were formed from formerly isolated specimens. Neither the diameter of the oocytes present in the coelomic fluid nor the number of setigerous segment...
Between 1966 and 1978 SCUBA investigations were carried out in French Polynesia, the Red Sea, and the Caribbean, at depths down to 70 m. Although there are fewer coral species in the Caribbean, the abundance o...
In spring and early summer,Pleuronectes platessa, Platichthys flesus, Solea solea, andCrangon crangon transform to benthic postlarvae in the shallow water region of the North Frisian Wadden Sea (eastern North Sea...
On sandy tidal flats at the Island of Sylt (North Sea) ephemeral mats of green algae covered wide areas in the vicinity of sewage outflows. Algae became anchored in the feeding funnels of lugworms (Arenicola mari...
The development of hard bottom communities has been studied on test panels in Helgoland Harbour (German Bight) since 1977. Settlement and growth of epibenthic species was examined monthly. Natural variation in...
The solitary scyphopolypStephanoscyphus planulophorus Werner, 1971 was detected in the submarine caves of the French Mediterranean coast near Marseille, and on the Sorrent Peninsula as well as near the Isle of Is...
Blennius (Salaria) pavo is a very common coastal fish in the Mediterranean Sea. The development of the ovary was studied over a period of one year; seven stages of oogenesis are described. Ripe eggs are carried ...
Pelagic fish eggs from IKMT hauls, taken during the 1979 Sargasso Sea Expedition, were sorted and classified according to structural aspects. 13 types were distinguished, one of them classified as exocoetid, t...
Spermatogenesis and especially oogenesis have been investigated in decerebrate and intact specimens ofAnaitides mucosa. The results indicate, in contrast to similar experiments on the related speciesEulalia virid...
The sperm cells ofPatella coerulea (Patellacea),Monodonta turbinata, andGibbula tumida (Trochacea) were investigated by means of transmission electron microscopy. They belong to the primitive type (sensu Franzén)...
Zoea-1 larvae ofHyas araneus were kept under different nutritional conditions. Their midgut glands were investigated with a transmission electron microscope. The glandular epithelium consists of the cell types kn...
Complementary to a previous publication (Kornmann & Sahling, 1977), this investigation deals mainly with microscopic algae occurring in the rocky littoral of Helgoland island (North Sea). Based on the results ...
Following evaluation of 634 aerial photographs, the dead marine plant biomass on the western Baltic Sea shores between Flensburg and Neustadt (Federal Republic of Germany) was estimated to be 300 t dry weight ...
Zoospores of the dinophytePaulsenella cf.chaetoceratis, parasitizing the marine diatomStreptotheca thamesis, attach to the girdle region of the host and drive a peduncle into the cell interior. The peduncle consi...
The cerithiaceanObtortio cf.fulva produces three distinct types of spermatozoa: (1) paraspermatozoa, (2) euspermatozoa and (3) eusperm-like spermatozoa. Like most mesogastropods, euspermatozoa ofObtortio are comp...
The Erratum to this article has been published in Helgoländer Meeresuntersuchungen 1982 35:Art10
The ejaculatory ducts of the two paired copulatory organs in the interstitial polychaeteHesionides arenaria are ciliated tubes, which open into simple, partly groove-like, non-stiffened penis papillae. The larger...
Former light microscopic studies on the lateral sense organs of sea spiders yielded divergent results. Consequently, different authors ascribed different functions to these organs. The present ultrastructural ...
Improved methods for experimental rearing ofPagurus bernhardus andCarcinus maenas larvae are presented. Isolated maintenance was found essential for reliable statistical evaluation of results obtained from stages...
Investigations during several cruises (1979–1981) showed that Atlantic cod with pseudobranchial tumours occurred in all areas investigated. Statistical analysis of data revealed that there was a marked prevale...
During the years 1923–1926 Hagmeier & Kändler (1927) sampled the macrofauna of subtidal shallows and channels of the Wadden Sea close to the Island of Sylt (German Bight, North Sea). Reinvestigating this study...
Advantages and limitations of different functions, employed to describe growth processes of animals, are briefly discussed. In this paper, a modification of a growth formula proposed by Johnson (1935) and used...
Hydrographic data for the period 19th March to 16th April 1979, obtained from cruise No. 210/92 of F.R.V. “Anton Dohrn” in the Sargasso Sea, are used for a description of the different water masses. Horizontal...
During the 1979 Sargasso Sea Expedition, 423 larvae ofAnguilla anguilla and 5 larvae ofA. rostrata were caught on three Atlantic transects and two cruises in the Sargasso Sea. Results of the identification of the...
Not applicable