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Fisheries survey of the upper Purari River. Part 2: Results and discussion

Sepik River Fish Stock Enhancement Project: PNG/85/001. Field Document No. 20b









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    Fisheries survey of the upper Purari River. Part 1: Methods and Description of sampling station
    Sepik River Fish Stock Enhancement Project: PNG/85/001. Field Document No. 20a
    1993
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    From August 1991 to August 1992 a fisheries survey of lower order streams of the upper Purari River, Papua New Guinea, was undertaken as part of the Sepik River Fish Stock Enhancement Project. The aim of this survey was to get general information on fishes and fisheries in the upper Purari and to get information on the biology of the introduced rainbow trout.
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    Survey of economic activities, animal protein intake, fishery activities and fish yieids in the Sepik-Ramu catchment, 1991-1992. Part II· Results and Discussion
    Sepik River Fish Stock Enhancement Project: PNG/85/001. Field Document No. 18b
    1993
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    In 1987 the Sepik River Fish Stock Enhancement Project (SRFSEP) started its activities. During the first stage (1987 - 1990). studies on the fish stocks in the lower order streams and rivers in the Sepik-Ramu catchment area were conducted. Prior to this the fish stock and fishing activities of the Sepik flooplain only had been studied. It was concluded that the yield from the Sepik-Ramu catchment area was about 10% that which could be expected from a similar size river system elsewhere in Asia. Afica or South America. The fish stock is thoughuo be limited by the-absence of native fish species from freshwater fish families due to the geological history of New Guinea. and the very recent creation of the Sepik floodplain (approximately 6000 years ago), with consequently very few (3) native fish species which are well adapted to floodplain conditions (Coates 1990). It was proposed that new fish species should be imported and stocked in the Sepik-Ramu catchment area to increase the total fi sh stock as a means to increase the fish catches. nutritional status and income of the population residing in the catchment area. During the first phase of the project several species were identified as suitable in terms of expected impact on fish yields and expected minimum effect on native fauna. Actual stocking of newly imported fish species by the project started in June 1991.
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    Yonki fisherfolk: report of a survey among people fishing at Yonki Reservoir, upper Ramu River, Eastern Highlands Province
    Sepik River Fish Stock Enhancement Project: PNG/85/001. Field Document No. 19
    1993
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    In January 1991 the dam built for electric power generation at Yonki township in the upper Ramu was closed. This started the flooding of grasslands, gardens and coffee plantations in the Arona Valley. In November 1991 the reservoir, which is at 1260 meters above sea level, reached the Full Supply Level and water started to flow over the spill way. At this level the reservoir covers an area of 2200 hectares. The shoreline of the reservoir is very dendritic and has an approximate length of 50 to 6 0 km. The new reservoir is the biggest water body in the high altitude region (i.e. > 1000 m above sea level) of the Sepik-Ramu catchment area. According to the 1990 National Population Census 9179 people live in census units within approximately 6 km from the reservoir, of which 2631 live in Yonki Township. Figure 1 shows a map of the reservoir with Yonki township and some of the nearby villages.

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