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Length Weight Relationship and Condition Factor of Indo-Pacific King Mackerel (Scomberomorus guttatus) in Pangandaran Water, West Java, Indonesia

100%
Tarigan A. L., Hamdani H., Yustiati A., Dewanti L. P.
World News of Natural Sciences
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2019
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vol. 24
199-208
EN
Scomberomorus guttatus is an economical valuable fish in Pangandaran, West Java, Indonesia. Indeed, the catch of large pelagic fish in Pangandaran water is dominated by Scomberomorus guttatus at around 42.30% of the total production of large pelagic fish in 2015-2017. The purpose of this research is to analyze length-weight relationship and condition factors of Scomberomorus guttatus. The samples were collected in August and September 2018 at Cikidang Fishing Port, Pangandaran Regency, West Java. The Scomberomorus guttatus observed during the research had total length ranging from 205 to 685 mmTL, and the length-weight relationship of Scomberomorus guttatus in Pangandaran water was indicated by the equation W=〖0,0000038L〗^3.0839. Furthermore, the growth pattern of Scomberomorus guttatus is positive allometric (b = 3.0839), meaning that weight growth is faster than length growth, while its condition factor range from 0.52 to 1.54 (average - 1.00 ±0.08).
2
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The Eco Friendly Level of Mini Purse Seine Based on Catch Decapterus spp in Pekalongan Nusantara Fishing Port, Central Java, Indonesia

100%
Prasetyo A., Hamdani H., Astuty S., Dewanti L. P.
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vol. 21
42-52
EN
Excessive exploitation of fish resources with the use of fishing gear that is not selective and not eco-friendly will have an impact on the sustainability of capture fisheries, and cause damage to fish resources and marine ecosystems. The mini purse seine is a fishing gear that is most widely used by fishermen in the sea of the north coast of Java. Research was undertaken the Nusantara Fisheries Port (PPN), Pekalongan. The purpose of this research is to analyze the level of eco friendliness of mini purse seine fishing based on the main catch, which is (Decapterus spp.). The research method used a survey method at PPN Pekalongan and follows the operation of 3 units of mini purse seine working the fishing ground on the North Coast of Central Java, in January-February 2018. Data taken included total catches, catch composition, diversity index and the size of the fork length. Data analysis used the proportion of the main catch and by-catch, as well as the proportion of fish worth catching and not catching. The results showed that the mini purse seine fishing gear caught 6 species with a total catch of 35,633 with a weight of 4,600 kg. The main catch is 51%, compared to 49% by-catch. The length of the main catch fish worth catching is 46% of all fish measured. Diversity index value is 1.42 (high diversity), based on a research mini purse seine operated in the the Java Sea. The results of our work indicate that mini purse seine fishing is not eco friendly - as seen from the criteria of catch composition.
3
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Abundance and distribution of sea urchins (Echinoidea Leske, 1778) on coral reefs in the waters of Latondu Island, Taka Bonerate, South Sulawesi, Indonesia

100%
Malik P. M., Riyantini I., Yuliadi L. P. S., Hamdani H.
World News of Natural Sciences
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2019
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vol. 27
59-72
EN
Sea urchin is one of the key biota of coral reef stability. Research on the abundance and distribution of urchins was carried out from January-August 2019 and field data retrieval occurred in March 2019 on Latondu Island, Taka Bonerate. This study aims to determine the relationship between sea urchin abundance with coral reef conditions and sea urchin distribution patterns in the waters of Latondu Island, Taka Bonerate. Observation of coral reefs and sea urchins was carried out at 3 stations with different criteria of coral reef conditions. Retrieval of coral reef data was done using the Point Intercept Transect (PIT) method, while sea urchin observation came about via a transect belt method. The results showed that in the waters of the island of Latondu, there were 133 sea urchins from 7 species of the Echinoidea class, namely Diadema setosum, Diadema antillarum, Echinometra mathaei, Echinotrix calamaris, Mespillia globulus, Heterocentrotus mammillatus and Echinotrix diadema. The largest abundance of sea urchins was found in Station 3 on the southern part of Latondu Island with 12 ind / 50m2, while Station 1 in the northeast and Station 2 in the northwest part showed 5 ind / 50m2. Sea urchin distribution at Station 1 with a value of 0.79 was uniform, Station 2 with a value of 0.80 was also uniform and Station 3 with a value of 0.91 was uniform as well. The relationship between Sea urchin and coral reef was 0.56, which meant the relationship was moderate and directly proportional.
4
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Analysis of Stingray Catches which Landed in Fish Landing Site of Labuan Bajo, West Manggarai Regency of East Nusa Tenggara

100%
Asut H., Hamdani H., Junianto J., Dewanti L. P.
World News of Natural Sciences
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2019
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vol. 24
89-99
EN
The purpose of the study was to determine the sustainability status of Stingray capture to determine the feasibility of catching Stingray in the waters of West Manggarai Regency. The research method used is the survey method, and this was conducted in July 2018 until mid-September 2018. The parameters studied included the type of Stingray, size and sex ratio. The results showed that the Stingray species found were A. narinari, D. kuhlii, H. granulata, H. uarnak, P. sephen, and T. lymma, with species diversity still stable (H' = 1,4). The average size of Stingray species caught makes it, however, not worth catching. Comparison of the Stingray sex ratio shows that T. lymma and H. granulata species were unbalanced, thus they should not be caught. D. kuhli and H. uarnak are still in balance so they can still be harvested. Based on conservation status in IUCN, the stingray that had the most severe threat status was H. granulata and H. uarnak, thus, these should not be harvested at all.
5
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Success Rate of Mangrove Planting based on Mangrove Morphology at Pramuka Island, Kepulauan Seribu National Park, Indonesia

100%
Palufi G. E., Hamdani H., Pratama R. I., Sahidin A.
World News of Natural Sciences
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2019
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vol. 27
73-84
EN
Planting mangroves on Pramuka Island is done in a monoculture way and usually fails. However, the planting managed by the Kepulauan Seribu National Park has become more successful. The specific objective of the research was to quantify the success rate of mangrove planting in Pramuka Island based on survival, growth and benthos levels in Pramuka Island mangroves. The mangrove planting area that was used as the research sample was an area wherein the planting are 14, 12 and 6 years old. The type of mangrove that planted is Rhizophora stylosa. The number of plots was determined based on the area. Data was collected in the form of primary data, namely, the number of living trees, tree heights, number of leaves and leaf dimensions. The success of mangrove planting reached 52%, 66.43% and 57.5% at stations 1, 2 and 3. The highest success rate was at station 2, while stations 1 and 3 are considered failures. This indicates that Pramuka Island has a low success rate of mangrove planting.
6
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Relationship between Length and Mouth Opening of Skipjack Tuna (Katsuwonus pelamis) in the Waters of Palabuhanratu Sukabumi Regency

100%
Ridwan M., Khan A. M. A., Zahidah Z., Hamdani H.
World News of Natural Sciences
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2020
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vol. 30
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issue 2
220-231
EN
Skipjack tuna (Katsuwonus pelamis (Linnaeus, 1758)) is one of the main commodities of Palabuhanratu capture fisheries with a percentage of 14% or 422.701 kg of total capture fisheries production in 2017. The purpose of this research is to analyze the correlation between length and mouth opening of skipjack tuna (Katsuwonus Pelamis) in the waters of Palabuhanratu Sukabumi Regency. The sample was collected in June until August 2019 at the Palabuhanratu Fishing Port, Sukabumi Regency. Skipjack tuna observed during the research had a total length range from 250 until 730 mm FL. The pattern of length and opening mouth relationships of skipjack tuna can be seen from the regression and correlation values. The results obtained were collected combined Y = 0.8064x - 0.2283 and R2 = 0.7786. Correlation value of the length and mouth opening relationship of skipjack tuna was 0.88. The level of length-mouth opening relationship of skipjack tuna is highly interrelated.
7
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Effect of Adding Pumpkin Flour and Carrot Flour on Changes in Color Intensity of Goldfish (Carassius auratus L.) Strain Oranda

88%
Ahlam R. N., Lili W., Hamdani H., Rosidah R., Bangkit I.
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vol. 26
52-60
EN
Goldfish is one of the most famous ornamental fish because of its body shape and color which was interesting to be maintained. The purpose of this research was to find the optimum dose of pumpkin and carrot flour combination on artificial feed to increase color brightness of goldfish. Complete Randomized Design with four treatments and four replications were used in the experiment. For the treatments, pumpkin flour 15%, pumpkin flour 7.5% with carrot flour 2.5% and carrot flour 5%, were studied. The parameters observed were color intensity, survival rate, and water quality. The results showed that supplementation of combination of pumpkin flour 7.5% with carrot flour 2.5% gave the highest color intensity of goldfish with TCF code 0815 and score 2.11 with 100% survival rate. Water qualities during the research were still in optimal condition.
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