Browsing by Author "Efriyeldi"

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    Proceeding of The 3rd International Seminar of Fisheries and Marine Science Pekanbaru-INDONESIA
    (2016-03-30) Hutauruk, Ronald Mangasi; Heltonika, Beni; Karnila, Rahman; Windarti; Syawal, Henni; Efriyeldi
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    Reproduction Aspects Of The “Sepetang” Clam (pharella acutidens) In Dumai Mangrove Ecosystem, Riau
    (2016-04-04) Efriyeldi
    The Pharella acutidens population in Dumai mangrove ecosystem was decreasing due to increase in exploitation and mangrove degradation. This research aims to study the reproduction aspects and spawning season of the “sepetang” clam (Pharella acutidens). This study was carried out for 12 months, from November 2010 to October 2011 at Dumai mangrove. The “sepetang” clam samples were collected monthly from the Dumai mangrove ecosystem, from three stations. The clam were collected through sampling plots, 1 m x 1 m quadratic transects. Reproductive aspects such as sex ratio, gonadal development, gonadosomatic index (GSI), fecundity and oocytes diameter were studied. Results shown that sex of the “sepetang” clam can be determined at the size of more than 35 mm. Male and female ratio was 1 : 1.12 and no hermaphroditism observed. Histological analysis indicated that P. acutidens had four distinguishable gonad development in male and female clam, namely early active, late active, ripe and partially spawned. The fecundity increase as shell length increase and it correlated significantly with shell length. Mean oocytes diameter does not show any monthly pattern, except on May to June, the mean of oocyte diameter was relatively small. Based on gonadal development, GSI and mean oocyte diameter, the “sepetang” clam probably spawn continuously throughout the year with a peak spawning season between May-June
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    Species Composition and Its Abundance of Mudskipper Fish from Dumai Coast, Riau, Indonesia
    (2016-03-31) Samiaji, Joko; Efriyeldi; Christina, Reny
    The study to observe the species composition and its abundance on mudskipper fish was conducted in June-September 2013 in Dumai coastal waters of Riau Province, Indonesia. The study was carried out in providing the lack information on the biological aspects of the mudskipper from Indonesian seas in general, and of Riau's coasts in particular. The study used a survey method by selecting 3 different stations as the sampling sites. Fish samples were collected during the low tide. The quadrants were used in the field in facilitating the survey in fish abundance, whilst the identification was commenced in the Laboratory of Marine Biology of University of Riau. The results showed that a number of three species of mudskipper were successfully recorded, i.e. Baleophthalmus boddarti (Pall), Periopthalmodon schlosseri dan Periopthalmus variabilis (Eggert). In terms of abundance, the highest, 16 individuals /m2 was recorded in station I and the lowest, 9 individuals/m2, was found in station III. Based on the diversity index (H'), it was reported that the the Dumai coast had moderate diversity of the mudskipper. None of the fish was dominating the population since the dominance index (C) was very close to null from each station. It can be concluded that the habitats of mudskipper in Dumai coasts were in the state of unstable due to its E value in which also close to null.