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Temp: Surf 20°C Bottom 18°C
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Dive type : Recreational
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Visibility: Average
Water: Fresh
Specific gear used
- BCD: Scubapro - X force 2
- Compass: Suunto - SK 8 Bungee
- Computer: Uwatec - Galileo Luna
- Cylinder: Aqualung - M12 short
- Fins: Aqualung - ADV
- Gloves: Seac Sub - 5mm 5 finger
- Knife: Scubapro - White Tipp
- Light: Kowalski - 620 Select
- Light: Sub Gear - SP 30 LED
- Mask: Aqualung - Look 2
- Other: Tusa - fini+depth meter
- Regulator: Seac Sub - X5-Ice
- Regulator: Seac Sub - X5.Ice
- Weights: 15 kg
Recent Divers in Strande, Schleswig-holstein
Recent Pictures in Strande, Schleswig-holstein
Dive Shop & Buddies
Dive buddies:
Michael
Dive Profile
- 1. Air
- 12L Steel
201 → 81 bar
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- Average depth: 6m
Data provided by EOL.org
Species Identified
Mytilus edulis Linnaeus, 1758 (edible blue mussel)
The mussel is a filter-feeder; it filters bacteria, plankton, and detritus from the water . When large beds of this gregarious species form, individuals are bonded together with threads of byssus. Predation is the greatest...
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The mussel is a filter-feeder; it filters bacteria, plankton, and detritus from the water . When large beds of this gregarious species form, individuals are bonded together with threads of byssus. Predation is the greatest cause of mortality; a range of predators take mussels, including dog-whelks (Nucella lapillus), crabs, sea urchins, star-fish, and birds such as the oystercatcher (Haematopus ostralegus) . Although mussels seem fairly defenceless, remarkably they are able to fend off marauding dog whelks and other predatory gastropods; a number of mussels work together to immobilise the predator with bysuss threads . Organisms that attach to mussels, such as seaweeds and barnacles, may increase the risk of the mussel becoming detached by wave action; however, mussels are able to sweep their foot over their shell, which may help to minimise the likelihood of such an organism becoming attached . The sexes are separate, fertilisation occurs externally and spawning peaks in spring and summer . The larval stage is free-swimming and planktonic for around 4 weeks , before settling first on filamentous organisms such as seaweeds . After growing for a while, they detach and drift in the water on a long byssal thread; a mode of dispersal likened to that of young spiders floating through the air on a silk thread . After four weeks or so, the young mussel will have settled again, this time on a mussel bed . Young mussels are thought to have evolved primary settlement on filamentous substrates in order to avoid having to compete with adult mussels . Mussels are host to the pea crab (Pinnotheres pisum), and a copepod (Mytilicola intestinalis), both of which are not parasites, as was once thought, but commensal organisms . Furthermore, mussel beds provide habitats for a variety of marine life, and support higher levels of biodiversity than surrounding mudflats . The biodiversity of the bed increases with its size and age .
Astropecten irregularis (sand star)
Metridium senile (Linnaeus, 1761) (clonal plumose anemone)
Aurelia aurita (Linnaeus, 1758) (moon jelly)
The common jellyfish is carnivorous, and feeds mainly on a variety of planktonic species such as molluscs, crustaceans, young worms and copepods . The plankton is caught in a layer of mucus that covers the jellyfish. Tiny ...
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The common jellyfish is carnivorous, and feeds mainly on a variety of planktonic species such as molluscs, crustaceans, young worms and copepods . The plankton is caught in a layer of mucus that covers the jellyfish. Tiny hair-like structures called 'cilia' on the body of the jellyfish produce currents by beating. These currents transport the captured plankton towards the edge of the 'bell', where it is removed with the arms and passed to the mouth . The tentacles around the margins of the bell and the arms bear stinging cells, which are occasionally used to catch small fishes and other prey . The sexes are separate and fertilisation occurs internally; the sperm is taken into the female's body via the mouth . The fertilised eggs undergo development in pockets in the arms that surround the mouth. The free-swimming larvae (known as 'planulae' larvae) are released during autumn; after some time these larvae settle and develop into tiny sessile animals ('scyphistomae'), which reproduce asexually and release free-swimming tiny immature jellyfish (called 'ephyrae'), which feed on plankton and become mature after around 3 months .
Platichthys flesus (Linnaeus, 1758) (European flounder)
Pomatoschistus minutus (Pallas, 1770) (freckled goby)
In the sand goby Pomatoschistus minutus (Teleostei; Gobiidae), a distribution-wide study showed that spatial variation at the rhodopsin gene matches the characteristics of specific light environments. This match sugg...
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In the sand goby Pomatoschistus minutus (Teleostei; Gobiidae), a distribution-wide study showed that spatial variation at the rhodopsin gene matches the characteristics of specific light environments. This match suggests that populations are locally adapted to selective light regimes targeting the RH1 gene.
Cancer pagurus (Edible crab)
Adult edible crabs take a very wide range of prey species, and are important predators of molluscs . When on sediments, these crabs dig large pits in order to find food . Females reach maturity at carapace widths of 1...
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Adult edible crabs take a very wide range of prey species, and are important predators of molluscs . When on sediments, these crabs dig large pits in order to find food . Females reach maturity at carapace widths of 12.7 cm, whereas in males the figure is closer to 11 cm . Breeding takes place in winter. For a period before mating, the male holds onto a female until she moults. After moulting she is receptive to mating and copulation takes place. The female digs a pit in the sediment which she retreats into to lays the eggs. She then carries the fertilised eggs for seven to eight months before they hatch in spring or summer. Large female can carry a staggering 20 million eggs at any one time. After hatching, the larvae are planktonic for up to 30 days. Edible crabs are known to live up to 20 years of age . The edible crab is the most commercially important species of crab in western Europe . It is fished offshore using baited pots .
Cottus gobio Linnaeus, 1758 (European bullhead)
The bullhead is crepuscular; it spends the day under stones or in vegetation and emerges at dusk to feed on small bottom-dwelling invertebrates such as insect larvae and crustaceans, as well as the eggs and larvae of other...
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The bullhead is crepuscular; it spends the day under stones or in vegetation and emerges at dusk to feed on small bottom-dwelling invertebrates such as insect larvae and crustaceans, as well as the eggs and larvae of other fish . They are occasionally cannibalistic, particularly of eggs in other nests . Bullheads are visual, ambush predators, and are good swimmers, moving quickly in short, sharp darts along the bed . The spawning season occurs between February and June, and fertilisation is external . The eggs are laid underneath stones or in a pit, and then guarded and cared for by the male who fans them to ensure that they receive enough oxygen . The eggs hatch two to four weeks later, and the larvae feed on their yolk sac for a further two weeks before dispersing. Maturity is reached within two years . Bullheads often behave aggressively towards one another, and competition for shelter and foraging space can be intense; research is currently being carried out by the University of Southampton into this area . Being small, bullheads are vulnerable to a wide range of predators, particularly brown trout, pike, grey heron, kingfisher and dippers .
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Marco
Germany
Date: 2015-08-14 - 16:52
Max Depth: 10.4m Duration: 77mins
