Batbitim marine conservation area (MCA) of Misool, Raja Ampat has been set as an area that is prohibited for fishing activities since 2005. The only activities allowed in that area are tourism and research activities. The difference in the management status between area inside the Batbitim MCA and outside the MCA might affect ecosystem components such as fish and coral reef in the respective area. The present study aims to investigate the ecological status of target fishes in the two areas. Data were collected by using an underwater visual census at 5 sites, in which at each site 3 transects were placed. Collected data are then used to assess ecological indices for the target fishes. It is found that there were 38 species of target fish belonging to 13 families. The diversity index of Shannon was found to be in the range between 0.99 (inside MCA) to 1.67 (outside MCA) and dominance index ranged between 0.26 (outside MCA) and 0.61(inside MCA). The abundance of individual target fish in each location varies between 960 ind ha−1 (outside MCA) and 9413 ind.ha−1 (inside MCA). Those results indicate that there is a discrepancy between the ecological status of the target fish at locations inside and outside the MCA.
Arfak rainbow fish, Melanotaenia arfakensis is an endemic fish on several river systems in the northeastern part of the Vogelkop peninsula. This study aims to describe the growth, age at first maturity, and sexual dimorphism of this endemic fish on the Nimbai Stream and the Aimasi Stream, the Prafi River system. The fish were caught using handnet, then were measured their standard length and individual weight. Data were analyzed to estimated growth patterns, von Bertalanffy's growth rate, age at first maturity and sexual dimorphism characteristics. The results showed that male growth patterns varied, with a tendency of the increase in body length faster than that of body weight (negative allometric patterns) with b values ranging from 2.886 to 3.132. On the other hand, the female individuals had positive allometric patterns (b values ranged from 3.062 to 3.378). The growth rate (K) of male body length was faster (0.165-0.174) than that of female individuals (0.159-0.163). Male individuals reached the first maturity condition earlier (at age of 1.83-2.18 years) than female individuals (at age of 2.49-2.64 years). Sexual characteristics between the sexes are related to body height starting to appear when fish are of a standard length of larger than 18.22 mm or when male fish begin to approach the time of the first sexual maturity. Understanding of growth, age, and the characteristics of the sexual dimorphism of endemic fish has an important meaning in monitoring population conditions and for conservation efforts in their natural habitat.
Indonesia has a wide variety of fish resources and one of them is yellowfin tuna. Tuna in Palabuhanratu is caught by Tonda and swamp tuna. Tuna is an export commodity that causes an increase in catches and requires proper management of fish resources. One of the information needed in fisheries management is the relationship between weight-length and fish condition factors. The purpose of this study is to determine growth pattern and factors of yellowfin tuna conditions landed at Palabuhanratu Fishing Port. The study was conducted in Palabuhanratu from September 2021 to January 2022. Data collection was carried out at the fish landing site at Palabuhanratu Fishing Port. The data collected in this study consisted of primary data and secondary data. Primary data consist of data on the length and weight of the fish. As many as 200 yellowfin tuna was measured their total length and weight. The total lengths of the measured tuna ranged from 30.9 - 101.9 cm. The growth pattern model analysis showed b value of 2.7. This indicates that yellowfin tuna in the study area had a negative allometric growth pattern (b<3), which explains that the length gained was faster than the weight gained. Tthe condition factor of the yellowfin tuna fish ranged from 0.70 – 1.54, with an average of 1.0. The condition factor is influenced by the availability of food because Indian Ocean is available with sufficient food because the Indian Ocean is famous for its upwelling area.
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