Population structure, length-weight and length-length relationships, and condition- and form-factors of the Pool barb Puntius sophore (Hamilton, 1822)(Cyprinidae) from the Chalan beel, north-central Bangladesh
The present study describes the length-frequency distribution, length-weight (LWR) and length-length relationships (LLR),and condition- and form-factors of Puntius sophore wild population from the Chalan beel, north-central Bangladesh.Sampling was done using traditional fishing gears including jhaki...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Penerbit UKM
2012
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/25373/ http://irep.iium.edu.my/25373/ http://irep.iium.edu.my/25373/1/Population_structure%2C_length-weight_and_length-length_relationships%2C_and_condition.pdf |
| Summary: | The present study describes the length-frequency distribution, length-weight (LWR) and length-length relationships (LLR),and condition- and form-factors of Puntius sophore wild population from the Chalan beel, north-central Bangladesh.Sampling was done using traditional fishing gears including jhaki jal (cast net), tar jal (square lift net), and dughair(conical trap) during March 2010 to February 2011. For each individual, the total length (TL), fork length (FL) and standard length (SL) were measured by digital slide calipers. Individual body weight (BW) was also taken by a digitalbalance. A total of 185 specimens ranging from 3.62-9.02 cm TL and 0.70-13.20 g BW were analyzed in this study. The ength-frequency distribution showed that the 6-7 cm TL size group was numerically dominant and constituted 43% of the
total population. The coefficient b of the LWRs indicated positive allometric growth (b>3.00) for P. sophore in the Chalan beel. The results also indicated that the LWRs were highly correlated (r2 > 0.945). The calculated Fulton’s condition factor(K) values ranged from 0.69-2.35, with a mean value 1.64±0.30. The relative weight (Wr) was not significantly different from 100 for (p=0.074), indicating the balance habitat with food availability relative to the presence of predators for P. sophore. The estimated values of form factor (a3.0) were as 0.0138, 0.0345 and 0.0435 for TL, FL and SL of P. sophore, respectively. These results will be useful for fishery biologists and conservationists to suggest adequate regulations for sustainable fishery management and conservation its numerous stocks in the region.
Kajian ini menunjukkan pengagihan kekerapan-panjang, hubungan berat-panjang (LWR) dan panjang-panjang (LLR), bentuk keadaan dan faktor populasi liar Puntius sophore dari Chalan beel, utara-tengah Bangladesh. Pensampelan dibuat menggunakan peralatan memancing tradisi termasuk jhaki jal (jala), tar jal (jaring angkut segi empat sama) dan dughair (perangkap kon) dari Mac 2010 hingga Februari 2011. Untuk setiap individu, jumlah panjang (TL), panjang cabang (FL) dan panjang piawai (SL) diukur menggunakan angkup slaid digital. Berat badan (BW) individu turut ditentukan menggunakan penimbang digital. Sejumlah 185 spesimen meliputi 3.62-9.02 cm TL dan 0.70-13.20 g BW telah dianalisis dalam kajian ini. Pengagihan kekerapan-panjang menunjukkan bahawa kumpulan saiz 6-7 cm TL adalah dominan dari segi bilangan dan meliputi 43% dari jumlah populasi. Pekali b LWR menunjukkan pertumbuhan alometri positif (b>3.00) untuk P. sophore dalam Chalan beel. Hasil juga menunjukkan bahawa LWR amat berhubung kait (r2>0.945). Faktor keadaan Fulton (K) yang dikira merangkumi 0.69-2.35, dengan nilai min 1.64±0.30. Berat relatif (Wr) tidak berbeza secara bermakna dengan 100 untuk (p=0.074), menunjukkan habitat seimbang dengan kesediaadaan makanan relatif berbanding dengan kehadiran pemangsa untuk P. sophore. Nilai yang dianggarkan untuk faktor bentuk (a3.0) adalah 0.0138, 0.0345 dan 0.0435 masing-masing untuk TL, FL dan SL P. sophore. Hasil ini berguna kepada ahli biologi dan pemuliharaan perikanan untuk mencadangkan peraturan yang mencukupi bagi pengurusan perikanan mampan dan pemuliharaan stok yang banyak di rantau ini.
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