Blackstripe Sweeper-Facts and Photographs

Blackstripe Sweeper (Pempheris schwenkii) is also known as Schwenki's Sweeper , Striped Bullseye,Silver Bullseye and Black-edged Sweeper

The Blackstripe Sweeper (Pempheris schwenkii) is also known as Schwenki’s Sweeper ,  Striped Bullseye,Silver Bullseye and Black-edged Sweeper. They are common fish on Tanzanian Reefs and are often found in extremely large numbers around caves and overhangs during the day. Research seems to indicate that there may be various sub species within the distribution range.

Blackstripe Sweeper (Pempheris schwenkii) is also known as Schwenki's Sweeper , Striped Bullseye,Silver Bullseye and Black-edged Sweeper

APPEARANCE

The Blackstripe Sweeper has a very distinctive hatchet shaped body, the shape is unmistakable. The more juvenile Blackstripe Sweeper which can be seen in the image immediately below, is more of a pinkish green translucent colour compared to the adult. Adults have a more coppery green coloured body.

They grow up to 12 cm in length but appear larger because of the depth of the body. Because of their nocturnal feeding habits, they have proportionately large eyes which allow better night vision. They obtain their common name from the black stripe that runs up the anal fin.

Black-stripe sweeper Pempheris schwenkii is also known as the Silver Bullseye , Yellowtail Sweeper, Silver sweeper, Black-edged Sweeper and Striped Bullseye

BLACKSTRIPE SWEEPER IN THE WILD

The Blackstripe Sweeper are nocturnal feeders and during the day collect in large  shoals under overhangs and in caves. The shoals can often be very dense and of quite some size. The shoals are often made up of various sub shoals as fish of a certain size will shoal together. The larger full grown specimens will often move above or outside the feature in which they hiding in. At night the shoals disperse to feed on plankton.

They are known to produce sounds and adult males seem to be able to produce the loudest sounds indicating that sound production may be mating related.

Blackstripe Sweeper (Pempheris schwenkii) is also known as Schwenki's Sweeper , Striped Bullseye,Silver Bullseye and Black-edged Sweeper

HABITAT

The Blackstripe Sweeper is found from East London in South Africa to the Red Sea and across to Southern Japan and down to Australia where they are known as Silver Bullseyes . They are found from 3 meters down to 30 meters.

Blackstripe Sweeper (Pempheris schwenkii) is also known as Schwenki's Sweeper , Striped Bullseye,Silver Bullseye and Black-edged Sweeper

DIET

The Blackstripe Sweeper are nocturnal feeders , feeding mainly on zooplankton. Once it is dark they swim above the substrate and feed on the zooplankton. On one night dive when we were diving on a large coral bommie,  a large shoal came and sat a few meters above us clearly feeding on organisms attracted by the lights. As soon as we moved upwards towards the shoal they dispersed. Otherwise they are usually seen singular or in small groups at night.

Black-stripe sweeper Pempheris schwenkii is also known as the Silver Bullseye , Yellowtail Sweeper, Silver sweeper, Black-edged Sweeper and Striped Bullseye

REPRODUCTION

Little seems known about their breeding habits although it seems that breeding is not tied to the moon cycles.

Blackstripe Sweeper (Pempheris schwenkii) is also known as Schwenki's Sweeper , Striped Bullseye,Silver Bullseye and Black-edged Sweeper

AQUARIUMS

Blackstripe Sweeper are not commonly kept in private aquariums. Sometimes they can be seen in large public aquariums.

Blackstripe Sweeper (Pempheris schwenkii) is also known as Schwenki's Sweeper , Striped Bullseye,Silver Bullseye and Black-edged Sweeper

READ OUR OTHER POSTS ON SWEEPERS HERE

Blackstripe Sweeper (Pempheris schwenkii) is also known as Schwenki's Sweeper , Striped Bullseye,Silver Bullseye and Black-edged Sweeper.

BLACKSTRIPE SWEEPER CLASSIFICATION

Kingdom:Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Pempheridae
Genus: Pempheris
Species P.schwenkii

LITERATURE CITED

http://oceansciencefoundation.org/josf/josf10c.pdf

https://www.cambridge.org/core/journals/journal-of-the-marine-biological-association-of-the-united-kingdom/article/sound-characteristics-and-the-sound-producing-system-in-silver-sweeper-pempheris-schwenkii-perciformes-pempheridae/D150E8EA730C2B21F525BC55B73E6743

EQUIPMENT USED

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