Bodianus bimaculatus

Family : Labridae

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Text © Giuseppe Mazza

 

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English translation by Mario Beltramini

 

Bodianus bimaculatus, Labridae, Twospot hogfish

Present in the Red Sea and in tropical Indo-Pacific, Bodianus bimaculatus does not reach 6 cm and is the smallest member of this genus © Giuseppe Mazza

The Bodianus bimaculatus Allen, 1973 belongs to the class of the Actinopterygii, the ray-finned fishes, to the order of the Perciformes and to the family of the Labridae, rich of 71 genera and 549 species, mostly changeable and gaudy.

The name of the genus Bodianus, assigned to about 30 species, gets its origin from the Portuguese “bodiano, pudiano” = shame, due to the often reddened head, as if for shame, frequent in these fishes. The specific term bimaculatus refers in Latin to the presence of two characteristic dark spots: one black bordered of yellow on the operculum, and one smaller, brownish, at the extremity of the caudal peduncle.

Zoogeography

The Bodianus bimaculatus has a very vast distribution in the tropical Indo-Pacific. Indicatively, we find it starting from the Red Sea and the Gulf of Aden along the African coast up to South Africa, in Madagascar and adjacent islands, and then in the Maldives and beyond, up to Indonesia, Guinea, Australia, Philippines, Taiwan and the southern part of Japan, whilst, southwards, it reaches New Zealand and, eastwards, the Fiji Islands.

Bodianus bimaculatus, Labridae, Twospot hogfish

It lives in relatively deep waters, at 30-60 m, in small groups formed by young and females and a big dominant male © Giuseppe Mazza

Ecology-Habitat

It swims in relatively shallow waters, at 30-60 m, among the madreporic formations, often on the detrital bottoms forming close to the crevices on the outer side of the reefs among soft sponges and corals.

Morphophysiology

It is the smallest member of the genus Bodianus with a maximum length of 5,9 cm in the males, notoriously bigger than the females, seen that this is a protogynous hermaphrodite species, where the females, while growing, transform in males.

The body is slender, moderately elongated, and the snout displays small canines protruding to catch the preys. The dorsal fin has 12 spiny rays and 9-10 soft; the anal, shorter, 3 spiny rays and 11-12 unarmed. All other fins are unarmed, with 14-16 rays for the pectoral ones. The caudal is more or less truncate.

Bodianus bimaculatus, Labridae, Twospot hogfish

Predates small benthic animals and is often collected for home aquaria. However, it is a very common species and is not endangered © Giuseppe Mazza

The livery changes with the age and shows a certain sexual dimorphism.

While maintaining the opercular ocellum black with yellow border and the brown or reddish dark spot, sometimes faded, on the caudal peduncle, the young are yellow, whilst the females tend orange with thin red longitudinal lines, and the male pink with more marked red lines, just hinted also in the multicolored dorsal fin and the anal one.

Ethology-Reproductive Biology

The Bodianus bimaculatus live in small schools formed by young males and females with a dominant male. They nourish of the small benthic animals they find while exploring the corals: small crustaceans, gastropod and bivalve mollusks, sea urchins and starfishes, small worms, and if it’s the case, also of some small fishes.

The fecundation occurs while swimming, when a female of the group is ready for spawning, and the eggs are entrusted to the currents.

Coloured, easy to feed and of modest size, the Bodianus bimaculatus is often a guest of the domestic aquaria. These collections, even if arguable, do not affect however in any way the survival of the species. The resilience is good, with possible doubling of the member in less than months, and nowadays, in 2020, the vulnerability index stands among the lowest, marking only 13 on a scale of 100.

 

→ For general information about fishes please click here.

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