Jurnal Iktiologi Indonesia
ISSN / EISSN : 16930339 / 25798634
Current Publisher: Masyarakat Iktiologi Indonesia (10.32491)
Total articles ≅ 90
Latest articles in this journal
Jurnal Iktiologi Indonesia, Volume 19, pp 297-314; doi:10.32491/jii.v19i2.494
Halmahera Epaulette Shark (Hemiscyllium halmahera) is an endemic fish in the North Maluku sea. This species was first discovered in two spots of Halmahera waters namely Ternate and Bacan in 2013. Halmahera Epaulette Shark research was continue in Weda and Kao Bay in 2016, 2017 and 2018. Those previous studies, however, did not reveal the morphological description of this species in the other part of the Halmahera Islands. This research was made to enhance the information about this species from the other part of Halmahera waters with a purpose to describe the morphology of Halmahera epaulette shark. The study was carried out in remote areas of Loleo, Tidore, Maitara, Mare, and Lelei Island in 2018. Photos of fish were documented, some meristic and morphometric characters and body weigt were measured. Halmahera epaulette shark has many local names. Observation results showed that many dark brown spots with different patterns and shapes were present with 0.5-1.2 cm in diameter. The total and standard lengths were 40-63 cm and 35-55 cm, respectively. Head length and head width ranged from 7-12 cm and 3-6 cm, respectively. The head height ranged from 9-10 cm. The body circumference of fish ranged between 11-24 cm. Pectoral fins length ranged from 4-6 cm. The dorsal fin length ranged from 5-6 cm. The lower tail length ranged from 4-6 cm. The upper tail length ranged from 4-6 cm. Fish mouth type is subterminal with pointed teeth.
Jurnal Iktiologi Indonesia, Volume 19, pp 411-423; doi:10.32491/jii.v19i3.469
Selective breeding of striped catfish (Pangasianodon hypophthalmus Sauvage, 1878) has been conducted at BPBAT Sungai Gelam to produce a growth line with mass selection method. Until 2018, the selective breeding program has produced three generations. Therefore, it was necessary to evaluate the performance of the third generation growth line (G3Ps) at the reproductive, seed and grow-out phase compared to the second generation the base population (G2Ds). A total of 10 pairs of broodstock (G3Ps and G2Ds) were spawned then the seeds were raised for 120 days in the media with regular water exchange (first treatment: T1) and without water exchange (second treatment: T2). The results showed that the number of eggs per gram of G3Ps (1600±124 eggs g-1) was significantly different from G2Ds (1490±101 eggs g-1). The bodyweight of G3Ps seeds at aged 40 days larger than G2Ds with selection response is 32.25%, while survival and feed efficiency were not significantly different. At the grow-out phase, between treat-ments were not significantly different and there was no interaction between lines and treatments for all the characters measured (p>0.05). The bodyweight of G3Ps was larger than the G2Ds with response selection 18.41% in T1 and 42.6% in T2. The control used was the base population so that the selection response obtained was an accumulation of three generations. Thus the selection response per generation was 6.14% in T1 and 14.20% in T2 measured at 162 days from hatching. It can be concluded that there is an improvement in the character of bodyweight for the third generation of growth line (G3Ps) as results of the selection at BPBAT Sungai Gelam both in good (T1) and bad environment (T2).
Jurnal Iktiologi Indonesia, Volume 19, pp 437-448; doi:10.32491/jii.v19i3.466
Clown loach Chromobotia macracanthus is one of Indonesian native species and as a key species for ornamental aquaculture. The problem in mass production of this species are the low of growth rate which causes a long period of rearing and low of survival rate. The purpose of the present study was to evaluate free glutamine supplementation at different doses in diet to increase physiological response, growth performance and survival rate of clown loach. Expe-rimental diets contained four different free glutamine levels, viz 0, 1, 2 and 3%. These diets were given to six repli-cate groups of 50 juvenile clown loaches. The fish were reared in each aquarium with dimensions of 40×30×30 cm3 for 60 days. Fish were fed four times a day at satiation. Parameters observed including intestinal glutamine concen-tration, villous and intestinal morphometry, intestinal protease activity, feed efficiency, nutrient retention, growth performance, survival rate, superoxide dismutase (SOD) activity, and malondialdehyde (MDA). The results showed that supplementation of 1% free glutamine significantly affected the morphometry of villi. The length and surface area of villi at a dose of 1% showed the highest values i.e., 320.44 ± 10.39 μm and 27,046.79 ± 250.54 μm2, respect-ively. The 1% dose also had a significant effect on protease activity (13.57 ± 1.92 mg units of protein-1) compared to the 0% dose. The 2% dose showed the highest SOD activity (0.82 ± 0.07 mg protein-1 unit) and the lowest MDA level was found at a dose of 3% (0.25 ± 0.02 nmol mg protein-1). Feed consumption with the supplementation of free glutamine has a significant effect on survival rate with the highest value reached 97.00 ± 1.00%, but no significant effect on intestinal morphometry, feed efficiency, nutrient retention and growth performance. Dietary with the sup-plementation of free glutamine is not able to improve growth performance, but can improve the physiological res-ponse and survival rate.
Jurnal Iktiologi Indonesia, Volume 19, pp 391-410; doi:10.32491/jii.v19i3.471
Diversity, potentiality and conservation status of fish fauna in upper Mahakam’s tributaries of east Kalimantan is unknown. The purposes of this study were to analysis species diversity, determine potentiality and conservation status of fish fauna in upper Mahakam’s tributaries, east Kalimantan. Fish sampling with purposive method was conducted in four tributaries, i.e Tepai River, Pahangai River, Danum Parai River, and Meraseh River for one month. Fishes were collected by several gears type. The results of this research showed that the total number of fish caught was 820 individuals; consist of 26 species, 7 families, and 4 orders. The Cyprinidae was the most dominant family found in all tributaries. The Shannon-Wiener diversity index in four tributaries were varied and ranging from 1.749-2.087. The highest fish diversity was recorded at Maraseh River followed by Pahangai River, Danum Parai River, and Tepai River. The low fish diversity was discovered at Tepai River may be due to differences in substrate type, water velocity, and water depth as compared to the Maraseh River, Pahangai River, Danum Parai River. The fish species similarity coefficient between four tributaries ranged from 0.606-0.842 and the highest dissimilarity was found between Tepai River and Danum Parai River. Almost all fishes categorized as edible fish for local consumption. Syncrossus hymenophysa and Gastromyzon lepidogaster have potential as ornamental fish. Regarding IUCN red list status, six fish species were grouped into least concern status, two species as data deficient, one species as near threatened, one species as endangered species and 16 other species were not on the list.
Jurnal Iktiologi Indonesia, Volume 19, pp 491-510; doi:10.32491/jii.v19i3.486
Seagrass are globally known as an essential habitat for marine fishes. The study of fish assemblages in seagrass ecosystem is needed as the first base to select the most suitable coastal fisheries management. The study aims to reveal the composition of fish assemblages both seasonally and spatially in Karang Congkak Island, Kepulauan Seribu. Sampling was performed six times in NW monsoon (March), first transitional monsoon (April-May) and SE monsoon (Juni, August, September) 2018. Fish were sampled at four sites at seagrass ecosystem of Karang Congkak Island, namely eastern, southern, western, and northern by using beach seine net. The differences of juvenile fish assemblages were analyzed using One-Way ANOSIM. A total of 6,326 fish were collected belonging to 78 species, 31 families and 10 orders in which Labridae was the most diverse family. The result indicates strong spatial and temporal variation in fish composition. Fish compositions were dominated by juvenile both spatially and temporally. The most common species that inhabits seagrass beds of the Karang Congkak Island as temporary resident such as Gerres oyena and Siganus canaliculatus, and regular visitor namely Halichoeres argus. Cannonical correspondence analysis indicated strong correlation between several fish species and environmental variables.
Jurnal Iktiologi Indonesia, Volume 19, pp 425-436; doi:10.32491/jii.v19i3.504
Micro-bubble generator is a device to maintain water quality by producing micron-sized bubbles. This study aims to evaluate the application of micro-bubble generator in different density on production performance and physiological response of nile tilapia reared in recirculating system. An experiment was designated by performing 3 densities, namely 15 , 30, and 45 individuals 60 L-1 with 3 replications. Every single unit of experiment applies a 34×42×41 cm3 maintenance container. The length size of fish used in this study was 7.44±2.89 cm and body weight of 10,96 ± 0,53 g. Fish were reared for 42 days in recirculation water system and fed ad satiation. The results of the evaluation of the physiological response showed that fish kept at density up to 45 60 L-1 did not show any changes, indicating that fish was in stress condition. The best production performance was in treatment A (15 individuals 60 L-1) with a specific growth rate of 1.87 ± 0.15% and a feed conversion ratio of 0.95 ± 0.08.
Jurnal Iktiologi Indonesia, Volume 19, pp 375-390; doi:10.32491/jii.v19i3.503
Sailfin molly, Poecilia latipinna is one of the alien ornamental fishes in Indonesia. This fish has been found in the aquaculture area in Maros Regency, south Sulawesi as a pest. The research aimed to identify species and observe aspects of reproductive biology of sailfin molly. The study was conducted in the Bosowa Isuma aquaculture area, in Maros Regency from November 2017 to April 2018. Fish was captured using a gillnet. The catches were separated for fish identifying and reproductive biology purposes. For the observation of reproductive biology, the samples were separated by sex according to external morphology. Measurement of total length and weight using calliper (mm) and analytical scales (g), respectively. The gonads preserved in the 4% formalin solution, used for determination of gonad developmental stages and fecundity. Identification results showed that the molly fish found in the ponds was Poecilia latipinna (Lesueur 1821). The length distribution of male and female fish was 26-76 and 31-66 mm with a mean of 51 and 46 mm, respectively. Overall, sex ratio and mature gonads between male and female fish were 1: 2 and 1:10; the growth patterns of male and female were negative allometrics and isometric, respectively. This fish is spawn throughout the year with the peak of spawning in January. The number of larvae to be born (larval fecundity) ranges from 12-111 individuals with an average of ± 32 larva/female.
Jurnal Iktiologi Indonesia, Volume 19, pp 349-359; doi:10.32491/jii.v19i3.501
This study aimed to evaluate the effectiveness of giving Daphnia sp. as a natural feed enriched with the doses of glutamine to increase growth performance and survival rate of larvae. This study used a completed randomized design which consisted of four treatments, namely 0, 25, 50, dan 75 mgL-1 and three replications. The test feed was given to larvae stocked with 60 fish/aquarium (40 cm x 30 cm x 30 cm) for 21 days. The results showed that significant on growth performance and survival rate were revealed on larvae fed with Daphnia sp. which enriched by glutamine dose of 25-75 mgL-1.The physiological response of protease enzyme and antioxidant activity showed that better performance was found in the treatment with addition of glutamine rather than control. In short, enrichment of Daphnia sp. using glutamine can improve the growth performance and survival rate of goramy larvae. The optimal dose of glutamine for improving the survival of gorami larvae is 25 mg L-1.
Jurnal Iktiologi Indonesia, Volume 19, pp 361-374; doi:10.32491/jii.v19i3.502
The ichthyofaunal study is needed to reveal the diversity of fish, investigate the existence of native and introduced fish, inventory some species that are potential as consumed and ornamental fishes, and to be a part of the effort to find new species. This study aimed to determine the composition of freshwater fish in the Alas River around Soraya Research Station, Leuser Ecosystem Area, Subulussalam, Aceh. Research was conducted from July to September 2018. Fish sampling was carried out at six research stations using selective gill nets, throwing net, hook, tray net, and scoop net. A total of 339 individual’s fish belonging to 20 species, eight families and three orders was collected from sampling location. Cyprinidae was the predominant family found in the Alas River. As many of 16 fish species has the potential as consumption fish. Two introduced fishes were collected, namely tilapia (Oreochromis niloticus) and Amazon sailfin catfish (Pterygoplichthys pardalis). One fish species is thought to have the potential as a new species, i.e. catfish (Hemibagrus sp.). The result of this study can be used as a basic data for policy decision making in order to develop management program of Leuser ecosystem in the future.
Jurnal Iktiologi Indonesia, Volume 19, pp 449-462; doi:10.32491/jii.v19i3.505
Information on trophic ecology can provide an understanding of the functional role of fish in an ecosystem, including endemic and native fish groups, as well as alien fish that are introduced through anthropogenic activities. The research on the trophic ecology of the fish community in the Nimbai Stream, Prafi River system, is intended to describe the interaction of competition and predation, especially towards endemic fish, Melanotaenia arfakensis. Fish samples were collected monthly from four habitat types, i.e., slow littoral, medium littoral, pool, and run from May 2016 to April 2017. A combination of an electric shocker and a hand net was used to collect fish samples. A total of 16 fish species were collected, consists of one endemic species, namely M. arfakensis, nine species of native fish, and six species of alien fish. The Arfak rainbowfish and three native fish species were categorized as insectivorous, four native fish species as herbivorous, and two other fishes as carnivorous. Three alien fish species also belong to insectivorous, two alien fish species as carnivorous, and one species as herbivorous. The niche breadth of fish communities ranges from 0.071 to 0.857. The trophic niche overlap between the Arfak rainbowfish and three native fish species and three alien fish species was recorded. The results of this study indicate a potential competition and predation interactions between Arfak rainbowfish and native fish as well as with alien fish species. Therefore, introducing alien fish into Prafi River system will disrupt Arfak rainbowfish population.