OCTOPUSES: WORTH LEARNING TO SCUBA FOR?


Octopus - Melinda Riger, Grand Bahama Scuba

OCTOPUSES: WORTH LEARNING TO SCUBA FOR?

If I had to give a single reason for learning to scuba, watching an octopus would be very near the top of a long list. It’s never going to happen for me, of course – I have about 17 excuses lined up just in case anyone should ask me to try it. But still. One can dream…

Octopus - Melinda Riger, Grand Bahama Scuba

Meanwhile, I can luckily rely on an experienced professional to get the shots. Here are a few great octopus photos taken by Melinda Riger of Grand Bahama Scuba – perfect examples of an excellent reason for chucking aside the snorkel and doing something a bit more adventurous. Maybe…

Octopus - Melinda Riger, Grand Bahama Scuba

RELATED OCTOPUS POST

THE CORRECT PLURAL Learn 12 essential octopus facts plus the definitively correct plural of the word ‘octopus’ (out of 3 rival options). Please note that the possibilities do not include ‘octopodices’, which would be latin for ‘eight rumps’ (or ‘asses’, as you might say), if such weird creatures existed.

Octopus - Melinda Riger, Grand Bahama Scuba

 

REMEOctopus - Melinda Riger, Grand Bahama ScubaMBER – KEEP AN EYE OUT…

 

STARR-STUDDED MUSICAL DIGRESSION

Does Ringo still have it? Did he ever have it?

BLUE TANG AS REEF FILM STAR


Blue Tang, Bahamas (Melinda Riger / Grand Bahama Scuba)

BLUE TANG AS REEF FILM STAR

Last summer, the big motion picture sensation for the bird world was, of course, Pixar’s ineffably adorable creation, Piper – the ultimate ‘Chick Flick’. This little ball of cartoon fluff was not, as some thought, based on a piping plover but on a sanderling – a type of sandpiper (clue in name). This 6 minute ‘short’ preceded the main event, the hugely popular Finding Dory. You can read all about the film Piper and the birding aspects of the film HERE

Blue Tang, Bahamas (Melinda Riger / Grand Bahama Scuba)

Finding Dory is not about a fish of the dory species, of course. Voiced by Ellen DeGeneres, Dory is in fact a species of surgeonfish Paracanthurus, the familiar blue tang found on the reefs of the Bahamas. To see these fish in Abaco waters, Fowl Cays National Park is always a good bet.

Blue Tang, Bahamas (Melinda Riger / Grand Bahama Scuba)

Dory can be identified as a maturing juvenile: blue, with a yellow tail. In due course – in time for the sequel film – she will become blue all over, with perhaps the odd flash of yellow (see photos above).

In real life, a baby blue tang is in fact entirely yellow, except for blue rings around the eyes. In Pixarland, however, Dory is just an adorbs miniature version of her youthful self.

Blue Tang juvenile, Bahamas (Melinda Riger / Grand Bahama Scuba)

Blue Tang are lovely to watch as they cruise round the reefs, sometimes in large groups. Their colouring ranges from pale to dark blue. However, these are fish that are best looked at and not touched – their caudal spines are very sharp. When the fish feels in threatened, the spine is raised and can cause deep cuts, with a risk of infection.  

Still from a crummy video taken at Fowl Cays some years back to illustrate a group of blue tangBlue Tangs, Fowl Cays Nature Park, Abaco Bahamas (KS)

Blue tangs are inedible, they apparently smell unpleasant, and they can cause ciguatera. However they are popular in the aquarium trade. This is a distinct downside of highly successful films such as Finding Nemo and Finding Dory. In defiance of the well-meant and broadly ecological message of both films, the trade in clown fish and to a lesser extent blue tang was boosted by their on-screen portrayal as adorbs creatures desirable for the entertainment of mankind… ‘Nuff said.

Blue Tang, Bahamas (Melinda Riger / Grand Bahama Scuba)

Credits: All excellent photos by Melinda Riger / Grand Bahama Scuba; one pathetically bad still from a low res video, me; cartoons purloined from an online aquarium somewhere or other

DUSKY DAMSELFISH: BAHAMAS REEF FISH (34)


Dusky Damselfish, Bahamas (Melinda Riger)

DUSKY DAMSELFISH: BAHAMAS REEF FISH (34)

The dusky damselfish Stegastes fuscus is one of a number of damselfish species found in Bahamian waters. These small reef fish, in adult form, are dark coloured as their name suggests. Their appearance is brightened by having distinctive blue edges to their fins.

Dusky Damselfish, Bahamas (Melinda Riger)

These fish feed mainly on algae, with a preference for red. They top up their diet with small invertebrates. Their value to the reef is that their feeding patterns help to prevent coarser seaweeds from becoming dominant in areas where these are prevalent. 

Dusky Damselfish, Bahamas (Melinda Riger)

Like many damselfish, the dusky is a territorial species, guarding its chosen area of seabed and the food sources within it by repelling intruders – often seeing off far larger algae-grazing fishes such as parrotfish and wrasse. Yet besides their aggressive traits, they are also rather cute, as photo #2 shows!

Dusky damselfish, Bahamas (Melinda Riger)

All photos: Melinda Riger / Grand Bahama Scuba

COMING HOME: IT’S ELVIS (THE SQUIRRELFISH)


Squirrelfish, BahamasBeing ‘on-island’ right now, I don’t get so much time to write stuff. To everyone’s relief, I guess (including mine). So for a while I’ll post some individual pics that particularly appeal to me. Elvis the squirrelfish (featured in a previous post) has now upgraded to a more spacious and frankly rather posher address. And in he goes…

FORAYS WITH MORAYS (4): EXPRESSIVE FEATURES


Green Moray Eel (Melinda Riger / Grand Bahama Scuba)

FORAYS WITH MORAYS (4): EXPRESSIVE FEATURES

Time to return to those extremely expressive characters of the coral reefs, moray eels. Specifically, some green morays. One hesitates to anthropomorphise or ‘project’ human emotions onto creatures but with some species it’s hard not to do so. Following Mr Grumpy (or perhaps Mr Sad) in the header image, here are some close-ups of morays appearing to express their emotions, from happy to downright furious… Eels featured here include Judy and Wasabi, and I remind myself that the human habit of naming familiar wild creatures is itself a (perfectly harmless) form of benign animism. Exactly as with the regular banded piping plovers featured elsewhere in this blog that overwinter on Abaco’s beaches, such as Harry Potter, Bahama Mama and the delightfully-named Felicia Fancybottom…

Happy and contented?Green Moray Eel (Melinda Riger / Grand Bahama Scuba)Green Moray Eel (Melinda Riger / Grand Bahama Scuba)Green Moray Eel (Melinda Riger / Grand Bahama Scuba)

Something on my mind…Green Moray Eel (Melinda Riger / Grand Bahama Scuba)

Slightly amused?Green Moray Eel (Melinda Riger / Grand Bahama Scuba)

Pretty funny, actuallyGreen Moray Eel (Melinda Riger / Grand Bahama Scuba)

Ha ha…! Hilair!Green Moray Eel (Melinda Riger / Grand Bahama Scuba)

Watch it. You are beginning to bug us, Mr Harbour, with your stupid captionsGreen Moray Eel (Melinda Riger / Grand Bahama Scuba)

ANGRY. BACK OFF… NOW!!!Green Moray Eel (Melinda Riger / Grand Bahama Scuba)

THE NEXT POST WILL BE FROM ABACO HQ NEXT WEEK

Credits: All morayvellous photos, Melinda Riger / Grand Bahama Scuba except 6, Virginia Cooper / Grand Bahama Scuba

WATER DOGS: THE POTCAKES OF SANDY POINT, ABACO


potcakes-at-sandy-point-abaco-1

WATER DOGS: THE POTCAKES OF SANDY POINT, ABACO

Sandy Point is the absolute end. Literally. Abaco’s only highway runs 120 miles from north to south. Towards the end, it hooks around to the west, then back north a short distance to the small community. You can drive on right through the settlement, with its criss-crossing side streets. Best stop driving when you see the ocean: you’ve run out of road.

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Sandy Point is home to the renowned Nancy’s culinary establishment, maybe a half-hour drive from the previous place you could get a meal along the highway. It’s that remote. The menu is elementary, the Kaliks are cold, the view from the verandah is out to the wide sea and the pelicans smashing down into the water off the sand bars. And sooner or later you will find a dog’s head in your lap. This is not part of an unordered Abaconian special menu with a Godfather theme; it’s a potcake looking for chicken. Or fish. Or chips. Or anything edible really.

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The origins of these ‘community dogs’ – no one’s and everyone’s – are many and various, just like their assorted shapes, sizes and colours. You can read about their history, the reason for their name, and about ‘Amigo’, the most famous potcake of all, HERE. There are many of these semi-feral dogs on the island, slinking around the settlements and even the main town. They have a tough life. They are generally ignored or shooed away. But in Sandy Point at least, they seem healthy and well-fed. Nancy’s may have something to do with it…

potcakes-at-sandy-point-abaco-5

The potcakes of Sandy Point make the beach and the sea their playground. If you walk along the strand and round the point, they may tag along for a while. Then they get bored and rush off. When the tide is low, they will trot along the exposed sandbars right out into the sea. Or chase each other into the sea. Or maybe just relax and watch an endemic Bahama swallow flit past.

potcakes-at-sandy-point-abaco-11potcakes-at-sandy-point-abaco-10

There are active potcake rescue schemes aimed at rehoming strays. Spay and neuter clinics are regularly held. The aim seems to be to keep the numbers down with benign control rather than anything more radical. And rehomed animals make excellent pets, being “intelligent, loyal, calm, and resilient”. I’m guessing the potcakes of Sandy Point reckon they have a pretty good life as it is. 

potcakes-at-sandy-point-abaco-12

AND FINALLY… here is a video with a difference: Salty Dog the potcake goes mad on a beach – wearing a GoPro! Great idea…

Credits: All photos by the management

BLUEHEAD WRASSE: PRIVATE LIFE LAID BARE


bluehead_wrasse_thallasoma_bifasciatum_oregonstate-edu-pinterest

BLUEHEAD WRASSE: PRIVATE LIFE LAID BARE

The bluehead wrasse (or blue-headed wrasse) Thalassoma bifasciatum is a denizen of the coral reefs of the tropical waters of the western Atlantic Ocean. This bright little 4-inch fish is… a wrasse with a blue head. No more and no less. Unless it’s a juvenile. Then it is mainly bright yellow. It’s similar to BLUE TANG (aka ‘the Disney Dory’), which starts life bright yellow and grows up to be blue.

blue-head-wrasse-melinda-riger-g-b-scuba-copy

The species may be found singly, in pairs or small groups, or in schools.  They have an important role to play in the life of the reef. They are CLEANER FISH, vital to the health and wellbeing of the larger species they attend to, and thus of the reef itself. This is ‘cleaning symbiosis’, a relationship of mutual benefit. The big fish get cleaned; the little fish have a useful function and – importantly for them – therefore don’t get eaten. 

thalassoma_bifasciatum_bluehead_wrasse_san_salvador_island_bahamas-james-st-john-wiki

Having said that, blueheads are of course fair game as a snack for species that aren’t in the market for their cleaning services. And, unfairly, some species that are content to let cleaner gobies runtle around their gills and mouths are not so considerate of the wrasse. Some types of grouper and moray eel, for example.

bluehead_wrasse

TELL US EXACTLY SEVEN BLUEHEAD WRASSE FACTS

  • Juveniles can alter the intensity of their colour, stripes & bars
  • The bluehead wrasse is a ‘protogynous sequential hermaphrodite’
  • All are born female**. Some change sex to male during maturation (see below)
  • Food includes zooplankton, small molluscs and small crustaceans…
  • …and parasites / other juicy bits (fungal growths, anyone?) from bigger fish
  • The main threat to the species is coral reef degradation or destruction
  • The bright colours invite aquarium use, but the trade is not a significant one

** Some sources suggest some are born male and remain male. I’m not sure which is right

A juvenile bluehead (with feather-duster worms) – mostly yellow, with a pale underside
Bluehead Wrasse juvenile (wiki)

THE REMARKABLE SEX LIFE OF THE BLUEHEAD WRASSE

This is an unavoidable topic, I’m afraid. The bluehead’s sex life is the most interesting thing about them, and this is no time to be prudish. It is the subject of extensive scientific research, not all of which I have read since I decided to write about the species last night. Like many human relationships, “it’s complicated”, but in a conch shell it boils down to this:

  • To recap, BWs are born female and as they mature, some become male.
  • Males reach an ‘initial phase’ when they can breed in groups with females
  • Some males grow even larger & reach full colouration. This is the ‘terminal phase’
  • These large males aggressively chase away smaller ones & seek females to pair with
  • Their state of readiness (as it were) is signalled by colour changes
  • This behaviour is similar to that seen in many city centres in a Saturday night
  • The smaller fish have one bonus – their sperm count is higher than a dominant male
  • Prozac tests have shown that the drug reduces a dominant male’s aggression

blue-headed_wrasse_det (wiki)

As the excellent organisation OCEANA puts it: Bluehead Wrasses may reproduce in four different ways throughout their lifetime:  1) as a female in a group spawning event; 2) as a female in a pair spawning event within the territory of a large male; 3) as a small male in a group spawning event; and 4) as a dominant, terminal male in a pair spawning event within its own territory.

A cropped still from a video I took at Fowl Cay marine reserve. I’ve looked at dozens of images online and not found one that was all blue with a yellow end to its tail fin. Maybe it’s not a BW at all. Or it’s a different type of fish completely. Or perhaps it is just an all-blue alpha male.bluehead-wrasse-fowl-cay-mr-abaco

Credits & Sources: Melinda Riger; Adam Rees; James St John; Oregon State edu / Pinterest; Wiki images; self; Oceana; IUCN; magpie pickings

A bluehead wrasse passes the time of day with a gruntbluehead-wrasse-grunt-adam-rees