Site Visit #122

Waters of Raga  /  September 4th, 2021

A very interesting visit to these three small lochs in Yell. I'd been looking forward to this as Dr Thomas Scott did a survey here in 1896 and listed the species found. The findings were written up in a report to the Scottish Fisheres Board. Dr Thomas Scott worked for the then Scottish Fisheris Board and was based at a hatchery at Nigg, Aberdeen. From what I can make out he visited in 1895, '96, '98, and possibly on more occasions. Scott was accompanied by his brother Andrew Scott, and Robert Duthie, the fisheries officer in Lerwick. Lochs were surveyed for zooplankton in Unst, Yell, Whalsay, Bressay, and on the Shetland Mainland.

Comparing the list of species which we found with Scott's records, the additional species on Scott's list are:

  • Alona affinis
  • Alonella excisa
  • Alonella nana
  • Attheyella crassa
  • Attheyella pygmaea
  • Cyclops fimbriatus
  • Cyclops serrulatus
  • Chydorus barbatus
  • Chydorus sphaericus
  • Drepanothrix dentata
  • Ilyocryptus sorditus
  • Graptholeberis testudinius
  • Moraia anderson (Scott)

(some species listed using old nomenclature)

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 2

Polyphemus pediculus

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 4

Polyphemus pediculus

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 2

Polyphemus pediculus

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 2

Bosmina (Eubosmina) longispina

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 2

Bosmina (Eubosmina) longispina

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 3

Bosmina (Eubosmina) longispina

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 2

Alonopsis elongata

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 2

Alonopsis elongata

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 1

Alonopsis elongata

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 2

Alonopsis elongata

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 2

Ceriodaphnia quadrangula

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 2

Ceriodaphnia quadrangula

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 3

Ceriodaphnia quadrangula

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 2

Ceriodaphnia quadrangula

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 2

Ceriodaphnia quadrangula

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 2

Ceriodaphnia quadrangula

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 2

Ceriodaphnia quadrangula

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 2

Ceriodaphnia quadrangula

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 3

Ceriodaphnia quadrangula

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 3

Ceriodaphnia quadrangula

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 1

Ceriodaphnia quadrangula

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 1

Ceriodaphnia quadrangula

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 5

Eurycercus lamellatus

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 3

Eurycercus lamellatus

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 2

Eurycercus lamellatus

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 3

Latona setifera

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 2

Diaphanosoma brachyurum

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 2

Acroperus harpae

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 2

Acroperus harpae

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 3

Acroperus harpae

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 2

Acantholeberis curvirostris

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 7

Macrocyclops albidus

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 5

Macrocyclops albidus

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 8

Cyclops strenuus abyssorum

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 5

Cyclops strenuus abyssorum

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 4

Cyclops strenuus abyssorum

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Please note this is an amateur project. Best efforts are made to identify species. However this website should not be relied on as a reference. Assistance with identifications and taxonomy is very much welcomed — please contact us.