Marine

Notchedfin threadfin bream

Nemipterus peronii

The body of the Notchedfin Threadfin has a standard length that is 3.1-4.1 times its depth, …

Nurse shark

Ginglymostoma cirratum

When viewed from above or from the side, the head of juvenile sharks is broadly arched, …

Nurseryfish

Kurtus gulliveri

The nurseryfish has an elongated body, tall anteriorly and laterally compressed. The posterior section is long …

Oblique-banded grouper

Epinephelus radiatus

Oblique-banded groupers are characterized by the following features: body depth in SL 2.6-3.0 times greater than …

Obtuse barracuda

Sphyraena obtusata

The body of the obtuse barracuda is elongated and subcylindrical, with small cycloid scales. The head …

Ocean surgeon

Acanthurus bahianus

Known for their oval bodies of uniform colouration (usually blue-grey to dark brown), pale to dark …

Oceanic two-wing flyingfish

Exocoetus obtusirostris

Externally, Exocoetus obtusirostris is similar to the tropical Exocoetus volitans, with which it shares much of …

Oceanic whitetip shark

Carcharhinus longimanus

The pectoral fins are considerably longer and wider than those of most other sharks and are …

Ocellaris clownfish

Amphiprion ocellaris

The body is stocky and oval in shape. It is compressed at the sides and has …

Ocellated eagle ray

Aetobatus ocellatus

Compared to A. narinari, A. ocellatus has a longer tail (mean total length 281 mm vs. …

Ocellated waspfish

Apistus carinatus

Body elongated, compressed at the sides, covered with scales. It differs from all genera of the …

Oman butterflyfish

Chaetodon dialeucos

Medium-sized fish with a very laterally compressed, high body, small terminal mouth, armed with small bristle-like …

One-striped poison-fang blenny

Meiacanthus ditrema

Males have long hairs on the tips of their tails.

Opaleye

Girella nigricans

The body is oval and compressed, the snout is thick and has a uniformly rounded profile, …

Orange skunk clownfish

Amphiprion sandaracinos

The body of these fish has an oval shape, with the body compressed on the sides …

Orange-lined triggerfish

Balistapus undulatus

This species is characterized by the following features: anterior part of the eye without an elongated …

Orange-spotted grouper

Epinephelus coioides

It has an elongated body with a standard length of 2.9-3.7 times its depth. The dorsal …

Orange-spotted trevally

Carangoides bajad

The body of the orange-spotted trevally is tall and strongly compressed at the sides. The upper …

Orangemouth Corvina

Cynoscion xanthulus

They usually have a silvery-sand coloration that blends in with their surroundings. Most of them are …

Orca

Orcinus orca

The Latin orca is thought to derive from the Greek ὄρυξ - a word used by …

Ornate butterflyfish

Chaetodon ornatissimus

Snout length 2.6-3.2 in HL. Body depth 1.3-1.6 in SL.

Ornate ghost pipefish

Solenostomus paradoxus

Vertebrae: 32-33. Post pelagic fishes are almost completely transparent and thinner compared to those formed in …

Ornate slippery goby

Lubricogobius ornatus

Ornate slippery goby body depth 2.9-3.9 cm. Anterior nostrils present. Dorsal and ventral margins of caudal …

Ornate threadfin bream

Nemipterus hexodon

Nemipterus: Greek, nema, -atos = filament + Greek, pteron = wing, fin.This species is characterised by …