QI – Part Sex

Ribbon eel

On the reef, there is not only competition for living space, but a continual contest…it’s the arms race between them that…has produced today’s extraordinary diversity of form.” – David Attenborough, Blue Planet

Q: What small creature lives in a colony, has a “queen” who is the only one to lay eggs and others are specialized to perform particular tasks?
A: Bees?
Q: Buzzzzzz – Wrong. Sponge Shrimp. The piece below from BBC’s extraordinary “Blue Planet” provides a glimpse into the hive of activity for these underwater eusocialites.

This week, the crackerjack of the counterintuitive, Steve Fry, has announced his plans to step down from his iconic BBC series, QI. He will be replaced by a new queen bee/shrimp, Sandi Toksvig. This post here is the 6th instalment of the Maldives Complete’s special tribute “Maldives QI”. And the Latin word for “six” has provided this inspiration for today’s reef reproductive repartee.

Q: What gender is a black Ribbon Eel?
A: Male?
Q: Buzzzzz – Wrong.
A: Female?
Q: Buzzzz – Wrong.
A: ???
Q: Actually, black Ribbon Eels are juvenile and at that stage of their development, they have no gender. They are believed to be “protandric hermaphrodites” which is a creature which both male and female organs. But the juvenile has neither. It is only when it matures that it first becomes a male of the species. One could say that it literally “grows a pair”. You can distinguish male Ribbon Eels by their blue colouring (see above). But not for too long because as it matures even further, then it becomes a female of the species and changes colour once again to yellow. So at least in the Ribbon Eel world, the females are definitively the most mature beings of the species.

“Part Sex” is particularly fitting for the lead photo above where the tinges of yellow on the head indicate that this ribbon eel has started his/her/its transgender operation.

Blue Planet - Social Shrimps

Best of the Maldives: Zebra Shark – Gangehi

Gangehi - Zebra shark

Shark Week!

The Discovery Channel’s annual Selachii celebration of these always intriguing ocean characters. In the Maldives, every week is Shark Week especially for the ubiquitous reef sharks (black-tipped and white-tipped). But the waters also are home to some more exotic varieties. One of these is the Zebra Shark. Native to the Indian Ocean, but nonetheless quite uncommon on the Maldives reefs. The best place to spot on is Gangehi resort where several have been spotted (pun intended) with considerable frequency. They are quite similar to the Nurse Sharks with their long caudal fin at back and their lazy daytime habits on the seafloor, but they are distinguished by their many spots along their back.

In honour of Shark Week, I have added the new “Shark” category tag to Maldives Complete so you have your own Maldivian virtual shark extravaganza any time you like.

Best of the Maldives: Nurse Sharks – Huvafenfushi

Huvafenfushi - Nurse Shark 2
Photo credit – NICOLE HERZ MSc

International Nursing Day today I thought was an apropos time to call out the eponymous “creature feature” nurse shark. As dependable as those faithful healthcare workers who alleviate our suffering, the similarly calm and composed ‘Ginglymostoma cirratum’ can be found on the Huvfenfushi house reef. Even more precisely, the resident marine biologist Nicole Hertz told us we could see her under the restaurant’s decking among the support pillars. Now, we’ve had lots of snorkel guides enthuse about lots of aquatic residents and, but unfortunately we all too often don’t have the fortune to see these allegedly regular visitors. But as advertised, we swam over and the Huva nurse was sitting on the sand precisely where Nickie said she would be.

Nurse Sharks are much more nocturnally active so it was not unexpected to see her just lying there. But, when we participated in Huvafenfushi’s night time “night aquarium”, she perked to life and paid us a visit with a number of graceful passes by the window (see below).

Huvfenfushi - nurse shark spa
Watching the nurse shark at night from the underwater spa.

Huvafenfushi - Nurse Shark
Photo credit – NICOLE HERZ MSc

Best of the Maldives: Mobula – Robinson Club

Alexander von Mende Mobula

(picture courtesy of Alexander von Mende)

Maldives diving expert Alexander von Mende not only helped with the Huvadhoo dive sites, but he also offered some very insightful tips for my Best of the Maldives research. He ventured that the dive site Dheeva Giri is the best in the Maldives for Mobulas. Well, I certainly hadn’t encountered these creatures in my 20 years of visits and research.

In fact, I didn’t even know what they were. So I turned to Alexander’s book which also includes an extensive marine life guide. It turns out that Mobulas as sort of mini-Mantas, also referred to colloquially as “Pygmy Devil Rays” (great name).

Alexander says that the only place he has seen them has been at Dheeva Giri and Nilamdhoo Kandu which is near Robinson Club. He commented…

We had a place which was regularly frequented by them in larger numbers: Dhevva Giri’s southern sand flats – quite a sight these small Manta relatives

Maldives QI, Part 5

Cycle of Clownfish Changing Sex

Q: What gender was Nemo?
A: Male
** BUZZZZZ **
A: Female?
Q: Actually, neither (or both) in all likelihood. Juvenile clown fish are born as hermaphrodites who can become either males or females later in life.
Q: What gender is Nemo’s Dad?
A: Ok, definitely got this one. First, the “Dad” is grown up and no longer a juvenile. Secondly, “Dad” means he is definitely “male”.
**BUZZZZZ ** Actually, Nemo’s “Dad” might have been a “male” at one point, but the key word here is “is”. What is he today? In all likelihood he is now a “Mom”. It turns out that when a “harem” of clown fish loses its dominant female, the largest male changes its sex to become the new female.

Tonight concludes Series “L” of “QI” which means that the team are now in the process of researching Series “M”…for “Maldives”. Maldives Complete has a whole series of potential Maldives-oriented questions the QI staff could consider especially concerning the ubiquitous “Nemo” fame. The latest twist is this latest discovery of this perplexing creature…

“Some species exhibit sequential hermaphroditism. In these species, such as many species of coral reef fishes, sex change is a normal anatomical process. Clownfish, wrasses, moray eels, gobies and other fish species are known to change sex, including reproductive functions. A school of clownfish is always built into a hierarchy with a female fish at the top. When she dies, the most dominant male changes sex and takes her place. In the wrasses (the family Labridae), sex change is from female to male, with the largest female of the harem changing into a male and taking over the harem upon the disappearance of the previous dominant male. Natural sex change, in both directions, has also been reported in mushroom corals. This is posited to take place in response to environmental or energetic constraints, and to improve the organism’s evolutionary fitness; similar phenomena are observed in some dioecious plants.”

 

Finding Nemo sex change

Best of the Maldives: Shark Feeding – Sun Island

Sun Island shark feeding

To feed or not to feed. That is the question.

Perhaps one of the many questions that might get addressed in this week’s infamous Discovery Channel “Shark Week”.

The feeding controversy rages across the online travel forums. The opponents tend to start from the ‘take only pictures, leave only footprints’ ethos of minimising interference in nature which is certainly a valid and sensible principle. To compound the protests are the quite serious health damage that can accrue to many fish when fed a number of human foods (most commonly breads). But there are also behavioural and other impacts to fish feeding practices. Even relatively safe foods fed from hands can make fish ‘aggressive’ to humans as they get thinking that any human will have some food to offer them.

Still, fish feeding remains an entertainment staple at many resorts. The most innocuous practice is to scoop out the large quantity of fish scraps that accrue from so many seafood dishes in the resort kitchens. These scraps are exactly the diet that the scavenging fish like sharks and rays eat anyway. Still, the dogmatic environmentalists will protest even these practices.

I have been torn on fish-scrap feeding. For the past year, I have contacted a number of marine biologists and posted on a number of forums to try to identify specific harmful impacts to fish populations of fish-scrap feeding. To date I have been unsuccessful in finding any bona fide harms to fish-scrap feeding.

I’m sure it is not ideal.  It is certainly not all ‘natural’.  So why would I even consider supporting the practice.

It might be that there is a relatively small downside impact to the practice, but a rather substantial upside. That benefit would be the classic ‘zoo argument’. The notion that having zoos or feedings or other contrived (but controlled for animal welfare) practices that bring humans and animals closer together is good for both humans and the animals. In our manufactured, processed and urbanised world, one of the biggest threats to nature is mankind’s distance from it. When people don’t have strong and deep connections to these creatures, as they are just tasty filets on their plate, then they lose the political will to raise funds for their preservation and pass constraining laws for their protection. By offering guests these feeding events, it gives them an opportunity to witness up close these animals and their inspiring qualities.

The more interactions we can foster between humans and nature, the most admiration and connection we can foster to them, I am convinced the more the world will muster up the resources, understanding and interest in investing in their welfare.

I have seen many of these events at resorts and Sun Island was by far the most mesmerizing. You have the regulars like the rays and the jacks, but the star attraction at Sun were the sharks. Every island has an array of reef sharks. While some get to be quite sizable, few are over a metre in length and most are pygmy-like pups not much more than a foot long. Sun had these, some bigger than I have seen in the lagoon waters, but they also were visited by a collection of nurse sharks. These fellows are quite sizeable and have the peculiar behaviour of ‘sitting’ on the ocean floor. Before the feeding started, Lori and I had arrived early and noticed these and we couldn’t tell if they were really sharks or just shark-shaped rocks on the ocean floor.

The Sun Island shark feeding does respect a number of parameters which do minimise any deleterious effects. First, dietarily, they only feed with fish scraps which would be consistent with the shark’s natural diet. Second, they are feeding from a pier and not from hand (as some sting ray feeding is done and as now stopped diving excursions have done in the past).

Whatever ever your perspective on this healthy debate, enjoy the frights and insights of Shark Week so that everyone can respect and support these wonderful creatures.

Pol-ypdate

Four Seasons Kuda Huraa reefscapers frame KH0327

They grow up so fast.

The Four Seasons have always had a website that allowed you to look up your Reefscaper coral frame and see how it was progressing, but now they have just relaunched a special website, Marine Savers, to provide not only frame update lookups, but also detailed information and updates on the ever broading range of their Maldives-leading conservation initiatives.

Above is our frame (KH0327) we planted in November 2010 at Four Seasons Kuda Huraa. Toddler-sized growths are looking pretty attractive compared to the collection of broken pieces that we affixed to the iron frame. Curiously, our frame (LG0729) planted during our visit to Four Seasons Landaa Giraavaru that same week is doing notably less well, but still clear healthy growth from the fragments first affixed.

Four Seasons Landaa Giraavaru reefscapers frame LG0729

Best of the Maldives: Guitar Sharks – W Retreat

W Retreat guitar sharks

“Swimming in, lord, the deep blue sea. I’d have a, all you pretty women, fishin’ after me.”

Jimi Hendrix would have been 70 today. And I’m sure that he would be riffing today. Often considered the greatest guitarist of all time, today’s post pays tribute with a similarly rare, striking individual in the Maldives waters – the Guitar Fish.

I was first alerted to these allusive critters during our visit by the W Retreat divemaster Hamid who told me about seeing them regularly. Hamid’s successor, Tessa Van Den Abbeele, added the following when I contacted her…

“Out of experience from being in the Maldives for a few years the Guitar fish is a spectacular specie to see but not often spotted, but said that we have encountered 3 guitar fishes together a few times around the house reef of W Retreat & Spa. Other sites we have seen them is Maaye Thila, Fish Head and Himendhoo thila. The guitarfish are a family, Rhinobatidae, of rays. The guitarfish are known for an elongated body with a flattened head and trunk and small ray like wings. The combined range of the various species is tropical, subtropical and temperate waters worldwide. They often travel in large schools. Guitarfish’s have a body form intermediate between those of sharks and rays. The tail has a typical shark-like form, but in many species the head has a triangular, or shovel-like shape, rather than the disc-shape formed by fusion with the pectoral fin found in other ray. The animal looks like a mix between shark and ray, they are often confused with sharks, especially when seen underwater for the first time. Maldivian fisherman for example simply refer to them as sharks. The largest can reach a length of over 3 meters. Guitarfish or most often seen while resting on the sandy bottoms in the vicinity of coral reefs. The mode of reproduction of all the family members is ovoviviparous (yolk sac viviparity) They swim in a shark like manner with lateral strokes of the tail and caudal fin not by undulating their pectoral fins like most rays do.”

It seems particularly a propos that a resort so imbued with music (and innovative music at that) would have such a captivating creature frequenting its reef.

PS. Joke for the kids…What do guitar fish perform? Guitar reefs?

Best of the Maldives: Whale Shark Odds – Holiday Island

Holiday Island whale shark sightings

Perhaps the ultimate underwater treasure in the Maldives is a whale shark sighting. Most of the time, the biggest animal that you can see there. And a paragon gentle-giant docility and prehistoric charm. And number of spots are known hang outs for these elusive creatures who spend their lives in the depths unless they are feeding. Those locations (eg. Dhidhdhoo, Hanifru) are all protected by the Maldives as Marine Sanctuaries. While they are more prevalent in these places (and at certain times of the year), there are never any guarantees when it comes to mother nature.

The resort dive centre, Dive Oceanus, keeps and publishes detailed data on whale shark sightings (see above) which can also help to focus one’s holiday timing and planning for the highest incidence and probability as well.

I have to confess that Lori and I were tinged with a touch of disappointment when our whale shark excursion this summer came up empty. Most South Ari resorts offer such excursions, but on specific days. If you really are obsessed with sighting one and want the highest odds possible, then Holiday Island (also located within the Dhidhdhoo Marine Sanctuary) offers daily excursions. They will even add extra trips for people if they request it. It might mean a lot of event-less boat rides for your holiday. But at least you will have given the effort you all. And the beautiful Maldives seascape makes for dazzling scenery as a consolation prize.

Best of the Maldives: Seahorses – Kuredu

Kuredu sea grass

The Queen has been such a supporter of of all of the June Jubilee activities including rocking out at the Buckingham Palace Concert which is probably not her dream Saturday night out. Rather, one’s favourite day in June is most definitely Ladies Day at Ascot today such is her love of all things horses. And ‘horses’ in the Maldives are a bit fabled and mystical creatures themselves…sea horses that is.

It indeed exciting to see the big game of snorkel safaris (and diving). But sometimes it is just as exciting and curious to uncover the tiny creatures. A baby manta, nudibranches, leaf fish. Perhaps the most enchanting and illusive is the Sea Horse.

Sea Horses are indigenous around the world including the Indian Ocean, mostly prominently Hippocampus borboniensis, dubbed ‘Réunion seahorse’ for its prevalence in this Maldive neighbour. I have asked many a dive master and no one has ever recalled seeing one or hearing reports of any. In fact, the TripAdvisor Forum on the Maldives posed this question last year and none of the Maldives veterans and experts had ever heard of a sea horse sighting.

Part of the issue is that sea horses live in sea grass which is not that common in the sand-bottomed lagoons and reefs prevalent in the Maldives. One resort which does feature sea grass is Kuredu (see photo above) and, lo and behold, they have reported sighting sea horses a few years ago. So if you want to start a holy grail hunt for these unicorns of the shallows, then start at Kuredu. Still, a bit of a long shot…or ‘dark horse’ if you will.

 

Seahorse