Tag Archive kzn

Latest news from the eels of KwaZulu-Natal

Last year, we’ve been granted a Foundational Biodiversity Information Programme grant to investigate the distribution and genetic diversity of Freshwater eels in the main rivers of KwaZulu-Natal. The project started in July 2016 and we just ended the field work.

This project aims to evaluate the change in historical distribution and genetic diversity of Anguillid eels along the East Coast of KwaZulu-Natal. To achieve these aims the following objectives have been proposed:

  1. Review the historical distribution (based on museum records) of freshwater eels in KwaZulu-Natal,
  2. Evaluate the change in distribution of freshwater eels in KwaZulu-Natal,
  3. Evaluate the genetic variability of freshwater eels from populations in main rivers of KwaZulu-Natal.

In the last two months, we focused our sampling effort in under-represented and under-sampled areas of the province where historical data was available as well as local knowledge. We then travelled to the Umtamvuna, Umzimkhulu, Umgeni, Thukela and the North Coast where we caught 15 eels (and 3 species Anguilla mossambica, A. marmorata and A. bengalensis labiata). Here are a few photos !

NB : All eels were released back where we caught them. It has to be noted that we work under a strict ethical code of conduct and that no fish were harm in any case. 

Guests at Zingela River Safari were really keen to learn about eels !

This eel caught in the Thukela was a little bit too big for our measuring pipe ! This is a giant mottled eel (A. marmorata) measuring 119 cm !

This African mottled eel, A. bengalensis labiata, has got some sharp teeth !

Setting some fyke nets and rafting in the Thukela

Electrofishing in the Thukela

Longfin eel (A. mossambica) caught in Harding in a farm dam !

Dr Peter Calverley, happy to help in Zingela ! Thanks to him for most of the photo presented here and all the help !

Setting fyke nets can sometimes be quite adventurous !

A pretty looking Longfin eel caught in Palm Lakes Estate. What do you think of that coloration ?

All the occurence data and barcode will be available ealy in the new year via GBIF and BOLD database.

We received tremendous help from local conservancies, fisherman, landowners and other enthusiasts and we want to really thank them for them help ! We would like to especially thank Michael House Nature Reserve, Donovale Farming, Palmiet Nature Reserve, the Payn Familly from Harding, Ben from Leitch Landscape, Helene and Paul from Simbithi Eco Estate, Dave and Chris from Palm Lakes Estate, Peter and everyone else at Zingela River Safari for their contribution (access, accomodation, warm welcome, help on the field and equipment).

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A tagging study : movements of KwaZulu-Natal yellowfish in the upper uMngeni River.

Riverine ecosystems are affected by anthropogenic activities and environmental changes. One of the ways in which to evaluate the effect of these impacts is assessing the behaviour ecology of fish populations. Fish behaviour tells us how fish adapt to human activities (survival and recruitment) and how they improve their use of ecosystem resources. Behavioural variables include habitat selection, reproduction and reproductive strategies and migration behaviour. Information on fish behaviour can be used in conservation of fish and the aquatic ecosystems they occupy.

As part of a study on the uMngeni River we will be looking at the reproductive biology and migration behaviour of the KwaZulu-Natal yellowfish (Labeobarbus natalensis). This involves evaluating the location, timing and duration of spawning migrations of yellowfish in the uMngeni River. Thus far, 22 yellowfish have been tagged with VI tags (Figure 1) at the inlet of the uMngeni River into Midmar dam, with the intention to tag more over time. We would like to call on all anglers in the upper uMgeni River for the assistance in recording data from any tagged yellowfish they may catch as this will aid the study immensely.

We need your help ! In the event that a tagged yellowfish is caught please, at best, take note of the following and let us know:

1. The location (include site coordinates if possible)
2. The date
3. The VI tag number (e.g. D 55)
4. The standard length of the fish (mm)*
5. The weight of the fish (g)
6.Note any abnormalities (e.g. deformity, disease or injury)
7. Photo of VI tag and full body photo (see examples below)

Figure 1: Orange arrows shows : on the left, the placement of the VI tag behind the eye, and on the right the placement of the VI tag in relation to the body of the fish.

Please Contact the following people below with any information or questions:
Pumla Dlamini: pumladlamini1@gmail.com, Matthew Burnett: matthew@riversoflife.co.za and Dr. Gordon O’Bien: obrien@ukzn.ac.za

 

* Standard length :

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