Size structure, length-weight relationship, and sex ratio of silky sharks (Carcharhinus falciformis, Müller & Henle, 1839) in Prigi waters, East Java, Indonesia
Silky sharks (Carcharhinus falciformis) are one of the shark species found in Prigi waters, East Java. According to the International Union for Conservation of Nature (IUCN), silky sharks are included in the near threatened species. The purpose of this study was to determine the size structure, leng...
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| Format: | Article |
| Language: | English |
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iVolga Press
2019-06-01
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| Series: | Biotika |
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| Online Access: | https://journal-biotika.com/current-issues/2019-02/article_02.pdf |
| _version_ | 1797763395763568640 |
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| author | Suseno B. Susiloningtyas D. Budiharsono S. |
| author_facet | Suseno B. Susiloningtyas D. Budiharsono S. |
| author_sort | Suseno B. |
| collection | DOAJ |
| description | Silky sharks (Carcharhinus falciformis) are one of the shark species found in Prigi waters, East Java. According to the International Union for Conservation of Nature (IUCN), silky sharks are included in the near threatened species. The purpose of this study was to determine the size structure, length-weight relationship, sex ratio, and level of gonadal maturity of silky sharks in Prigi waters, East Java. This research was conducted at Pelabuhan Perikanan Nusantara in Prigi, using descriptive methods. The data used were total length data and weight of C. falciformis. The study took samples of 30 individuals, consisting of 19 males and 21 females. The size of C. falciformis ranged from 61-189 cm. The longest male sharks were around 76-103 cm and the longest female sharks were 81-100 cm. The weight of C. falciformis ranged from 3.5 kg to 55 kg with an average of 8.5 kg. The length-weight relationship of C. falciformis resulted in and equation of y = 2.4087x-9.0779. From this value, it can be concluded that the growth pattern has negative allometric where the growth of the body of the sharks is not balanced with their weight gain. The sex ratio between male and female is unbalanced, which is 0.45: 1. |
| first_indexed | 2024-03-12T19:41:57Z |
| format | Article |
| id | doaj.art-0d1b93812a194c4f8a3d7606783eea76 |
| institution | Directory Open Access Journal |
| issn | 2410-9290 |
| language | English |
| last_indexed | 2024-03-12T19:41:57Z |
| publishDate | 2019-06-01 |
| publisher | iVolga Press |
| record_format | Article |
| series | Biotika |
| spelling | doaj.art-0d1b93812a194c4f8a3d7606783eea762023-08-02T03:46:11ZengiVolga PressBiotika2410-92902019-06-01272914Size structure, length-weight relationship, and sex ratio of silky sharks (Carcharhinus falciformis, Müller & Henle, 1839) in Prigi waters, East Java, IndonesiaSuseno B.0Susiloningtyas D.1Budiharsono S.2Marine Sciences Program, Faculty of Mathematics and Natural Sciences, University of IndonesiaMarine Sciences Program, Faculty of Mathematics and Natural Sciences, University of IndonesiaMarine Sciences Program, Faculty of Mathematics and Natural Sciences, University of IndonesiaSilky sharks (Carcharhinus falciformis) are one of the shark species found in Prigi waters, East Java. According to the International Union for Conservation of Nature (IUCN), silky sharks are included in the near threatened species. The purpose of this study was to determine the size structure, length-weight relationship, sex ratio, and level of gonadal maturity of silky sharks in Prigi waters, East Java. This research was conducted at Pelabuhan Perikanan Nusantara in Prigi, using descriptive methods. The data used were total length data and weight of C. falciformis. The study took samples of 30 individuals, consisting of 19 males and 21 females. The size of C. falciformis ranged from 61-189 cm. The longest male sharks were around 76-103 cm and the longest female sharks were 81-100 cm. The weight of C. falciformis ranged from 3.5 kg to 55 kg with an average of 8.5 kg. The length-weight relationship of C. falciformis resulted in and equation of y = 2.4087x-9.0779. From this value, it can be concluded that the growth pattern has negative allometric where the growth of the body of the sharks is not balanced with their weight gain. The sex ratio between male and female is unbalanced, which is 0.45: 1.https://journal-biotika.com/current-issues/2019-02/article_02.pdfCarcharhinus falciformislength-weightsex ratioPrigi |
| spellingShingle | Suseno B. Susiloningtyas D. Budiharsono S. Size structure, length-weight relationship, and sex ratio of silky sharks (Carcharhinus falciformis, Müller & Henle, 1839) in Prigi waters, East Java, Indonesia Biotika Carcharhinus falciformis length-weight sex ratio Prigi |
| title | Size structure, length-weight relationship, and sex ratio of silky sharks (Carcharhinus falciformis, Müller & Henle, 1839) in Prigi waters, East Java, Indonesia |
| title_full | Size structure, length-weight relationship, and sex ratio of silky sharks (Carcharhinus falciformis, Müller & Henle, 1839) in Prigi waters, East Java, Indonesia |
| title_fullStr | Size structure, length-weight relationship, and sex ratio of silky sharks (Carcharhinus falciformis, Müller & Henle, 1839) in Prigi waters, East Java, Indonesia |
| title_full_unstemmed | Size structure, length-weight relationship, and sex ratio of silky sharks (Carcharhinus falciformis, Müller & Henle, 1839) in Prigi waters, East Java, Indonesia |
| title_short | Size structure, length-weight relationship, and sex ratio of silky sharks (Carcharhinus falciformis, Müller & Henle, 1839) in Prigi waters, East Java, Indonesia |
| title_sort | size structure length weight relationship and sex ratio of silky sharks carcharhinus falciformis muller henle 1839 in prigi waters east java indonesia |
| topic | Carcharhinus falciformis length-weight sex ratio Prigi |
| url | https://journal-biotika.com/current-issues/2019-02/article_02.pdf |
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