Shoreline
of sea creatures
It was a dull day, overcast with clouds. We heard
that it had rained in the morning all the way from Colombo to Beruwela.
Fortunately, for me, the rain did not come to Galle, and it became
sunny by noon. We took advantage of the overcast day to go for a
sea shore walk with the children.
I spent a lot of time perched atop the rocks near
several rock pools, besides the 300 m or more of shoreline, which
runs besides the Lighthouse Hotel and Spa. The rock pools are another
amazing world of natural wonders, which very few visitors see. A
number of small fish darted around the pools, coming and going with
large waves, which would sweep in and out the fast flowing torrent
of water.
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A Mudskipper wallows in the mud. |
There was a large number of Rock Crabs, which would
scurry away at my approach. After a while they would regain the
confidence to emerge again. The Mudskippers were also quite wary.
I observed them through my 400 mm lens. I noticed how the pair of
eyes had migrated to the top, enabling them to keep watch in the
direction from which danger would arise. As they wriggle about on
the rocks, danger can only be from above. The same applies to the
crabs, whose eyes are also at the top. The Mudskippers can fling
themselves off the rocks into a nearby pool of water, if they feel
threatened. Otherwise they would use the flow of the waves, which
wash over the rocks every fifteen seconds or so. They only seemed
to be present on rocks, where a well-aerated wave would wash over
frequently. Some seemed to have a curved hump on their head, rather
like the early bird dinosaurs in Jurassic Park. They seemed to be
feeding rather feverishly by grazing the rocks for algae or tiny
animals. Their pectoral fins are wide with strong radiating bones
to enable them to use their fins for gripping onto the rocks. They
are such extraordinary animals.
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A Crab makes his slow and slanted way along
the sea shore |
Sea Urchins, limpets and clams clung onto the
rocks on the tide line. I had bought a copy of the Periplus Nature
Guides Tropical Shells of India and Sri Lanka. This was a big hit
with the two little girls and mother, who together with Anoma Alagiyawadu
attempted to identify some of the seashells on the beach. The seashells
are nothing more than the outer skeleton of dead animals, many of
whom are marine snails. Although snails don't seem particularly
exciting, the Periplus guide provides some fascinating insights
into a group of animals, which are interesting in their own right.
For example, we learnt that the Moon Shells (Naticidae) are blind
or nearly blind, because they live under the sand and use chemical
detection to catch their prey. When it locates another marine snail
it will prey on, it excretes a chemical substance to make a hole
in the shell of its prey. Seashells with a small hole on the side
could be victims of a Moon Shell.
Some of the families which we identified, included
Limpets (Acamaeidae/Fissurellidae), Abalones (Haliotidae), Top Shells
(Torchidae), Periwinkles (Littorinidae), Cowries (Cypraeidae), Murex
Shells (Muricidae), Olive Shells (Olividae), Augurs (Terebridae),
and Sundials (Architectonicidae).
Gehan's Journal is an ad hoc series of lightly edited
extracts from the 'on the hoof' notes, maintained on his laptop,
by writer and photographer Gehan de Silva Wijeyeratne
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