Widigdo B, Rukisah, Laga A, Hakim AA, Wardiatno Y. 2017. Carapace length-weight and width-weight relationships of Scylla serrata in Bulungan District, North Kalimantan, Indonesia. Biodiversitas 18: 1316-1323. The mud crab, Scylla serrata lives associated with mangrove ecosystems and is widely distributed in the Indo West-Pacific. The present work was aimed to reveal the carapace length/width-weight relationships of Scylla serrata in two mangrove ecosystem area of Bulungan District, North Kalimantan- Indonesia, i.e. Kahayan Delta and Tibi Island. The crabs were collected by using ambau pancang (trap) for two months from November to December 2016. A total of 522 individuals were collected and their carapace length, carapace width, and weight were measured. The sex ratio of total collected samples (male to female) was 1:0.79. Carapace length and width of S. serrata caught in these two study area ranged from 40 to 89 mm for male; 32 to 91 mm for female and 59 to 128 mm for male; 53 to 122 mm for female, respectively. The carapace length-weight relationships of total samples showed logarithmic equations as follow: W = -3.2194 + 2.9725 Log CL for male and Log W = -2.2010 + 2.3750 Log CL for female. While the carapace width-weight relationships are as follow: W = -3.9162 + 3.1012 Log CW for male and Log W = -2.6001 + 2.3968 Log CW for female. The b values of carapace width-weight relationship indicated that the growth pattern of male was positive allometric and female was negative allometric. Size frequency of crab population is also presented.

This research aims to analyze the allometric growth and condition index of white shrimp (Litopenaeus vannamei) from fishpond and Juata Laut waters, Tarakan (Indonesia). The study was conducted for 3 months, from January to March 2020. The objective method was descriptive quantitative with a case study approach. The determination of the research area by using purposive sampling from fishpond and the catches of trawl fishermen from Juata Laut waters, Tarakan (Indonesia). A sampling of white shrimp (L.vannamei) used survey methods in those two locations. The data collection was done by using a laboratory scale in the Biology Laboratory of Faculty of Fisheries and Marine Science, University of Borneo Tarakan. The data instead of sex, total length, carapace length, and the total weight of white shrimp (L.vannamei). The research variables were sex ratio, allometric growth, and condition index of the male and female white shrimp (L.vannamei). The results study showed that white shrimp (L.vannamei) from ponds had a sex ratio for males and females of 1:3 with a percentage of males by 25% and females by 75%. The allometric growth,i.e.total length, and total weight for both of sex were negative, condition index with a thinner body was not found for male and 1,9% for females; thin body shape was 50% and 53.7%; ideal body shape was 5.6% while females were not found; the fat body was 44.4% and 40.7%; the fatter body for male was not found and females by 3.7%. The results from Juata Laut waters obtained the sex ratio for males and females was 1.68:1 with the percentage of males was 62.71%, and females were 37.29%. The allometric growth like total length and a total weight of males and females was negative with condition index of males and females for thin body shapes were 48.6% and 45.5%; ideal body shape were 2.7% and 9.1%; fat body shape was 45.9% and 45.5%; fatter body shape was 2.7%, respectively and females were not found.

HighlightThe sex ratio of giant prawns in the waters of fe- male groceries is 3 times higher than that of males.The growth characteristic of male and female   giant   prawns   is   negative   allometry, but the male and female body shapes are fat.Total   mortality, capture mortality, catch rate, male prawns are higher than females.The male infinitive growth is longer than the female,but the female’s growth rate is faster than male.AbstractGiant prawns (Macrobrachium rosenbergii) is a crustacean class that has the larg- est size and its habitat in Sembakung waters included brackish water (estuarine) with a salinity variable of 6.5+0.5 ppt and a temperature variable of 28.5+0.5OC and a variable pH of 6 (acidic). The objective of this research was to analyze the growth and mortality model of giant prawns (M. rosenbergii) that was taken from the catch of fisherman in the estuary, Sembakung sub-district, Nunukan Regency, Indonesia. The study was conducted for 3 months from November 2019 to Janu- ary 2020. The sampling was by using a survey method with purposive judgment sampling based on a catch of 14 fishermen who used the bottom fish pot from Sembakung waters, Nunukan Regency (Indonesia). The data collection included data of sex, total length, and the total weight of giant prawns. While analysis was employed for growth pattern, condition index, Von Bertalanffy growth, and mor- tality. The results obtain the sex ratio of male and female giant prawns 1:3.67. The growth pattern of male and female giant prawns were allometric negative. The growth of the von Bertalanffy model for infinitive growth of male giant prawns were 21.219 cm and female were 18.42 cm, respectively the mortality from giant prawns obtain total male mortality is 2,257, catch mortality is 1.92 and natural mortality is 33.75% with an exploitation rate of 0.85 (85%). The total female mor- tality is 1.528, catch mortality is 120.1% and natural mortality is 32.69% with an exploitation rate of 0.786 (78.6%).

Milkfish (Chanos chanos) gelatin was successfully developed as biosensor material. The milkfish bone was obtained from local restaurants in Tarakan, North Borneo, Indonesia. Gelatin was extracted from milkfish bone using acid method at 55°C. Characterization by FTIR showed that milkfish gelatin had similar functional group with commercial gelatin. The gelatin was used as biosensor material for detecting chromium. The gelatin was mixed with carbon in 1:1 ratio to form gelatin/carbon paste modified silver electrode. Electrochemical impedance spectroscopy (EIS) analysis of the gelatin/carbon paste modified silver electrode showed a better conductivity than paraffin/carbon paste modified silver electrode. Performance of the gelatin/carbon paste modified silver electrode in chromium (III) solution was conducted using cyclic voltammetry technique. Measurement was carried out at -1 V to +1 V with scan rate of 100 mV/s in acid and base condition. The best result was shown by gelatin/carbon paste modified silver electrode. It can detect chromium (III) ions at reduction potential of -0.78 V in alkaline condition. Unspecific responses were observed from silver electrode, paraffin/silver electrode, carbon/silver electrode, gelatin/silver electrode and paraffin/carbon paste modified silver electrode. This result can be concluded that the milkfish gelatin obtained have a potential to be developed as chromium (III) biosensor.

The purposes of this research were to analyze the growth of allometric and condition index of tiger shrimp (P.monodon) in Juata Laut waters and fishpond, Tarakan (Indonesia). The implementation of research for 3 months from January to March 2020. The research method used a quantitative descriptive with a case study and exploratory approach. The determination of the study area was done with purposive judgment sampling originating from the catch of trawl fishermen in Juata Laut waters and fishpond, Tarakan (Indonesia). A sampling of tiger shrimp (P.monodon) based on surveys of the catches from those two locations. The data collection method involved the differences between sex, total length, carapace length, and the total weight of tiger shrimp (P.monodon) in the Laboratory of Fisheries Biology, Faculty of Fisheries and Marine Science, University of Borneo Tarakan. The research variables were sex ratio, allometric growth, and condition index of male and female tiger shrimp. The results from Juata Laut waters obtained a sex ratio for males and females was 2:1 with a percentage of the male at 66.7% and female at 33.3%. The allometric growth, i.e., a total length and a total weight of male was positive and female was negative with a condition index of male and female for thin body shape was 56.3% and 50%; ideal body shape of 12.5% and female not found; fat body shape was 31.3% and 50%, respectively. The results from fishpond showed that the sex ratio for males and females was 1:1.52, with a percentage of 39.6% for males and females was 60.4%. The allometric growth of total length and total weight from the male was negative and female was positive with condition index of a male was 2.4% and female was not found; the thin body shapes was 32.7% and 48.4%; the ideal body of 2.4% and 1.6%; the fat body was 57.1% and 50% for each one; very fat body was 2.4% and female was not found.

HighlightsThe Paku Uban (Nephrolepis biserrata) was identified and analyzedThe ability of paku uban to stimulated molting process of Scylla sp was analyzedThe paku uban (Nephrolepis biserrata) could increase the presentation of molting and accelerate molting processAbstractMud crab (Scylla spp.) is a fishery commodity with high economic value. For this reason, efforts to increase production are required with a more effective applicative technology. This study aims to determine the molting response and survival rate of mud crabs injected with paku uban leaf  extract (N. biserrata) at different doses. The study was conducted for 30 days, located in Tibi Island, Tanah Lia District, Tanah Tidung. The design used in this study was a completely randomized design (CRD) with five treatments and eight replicates. Mud crabs weighing 80 - 150 g were tested in K1 (without injection), K2 (controlled injection), P1 (100 ppm extract), P2 (125 ppm extract) and P3 (150 ppm extract). The effectivity of paku uban (N. biserrata) extract with the highest percentage of molting of 50% took place at P3, 37.5% at P2, and 25% at P1. The lowest levels of molting percentage were at K1 and K2 by 0%. The fastest molting period was ten days at P2, and the longest was 29 days at P1. The highest weight growth reached 33.75 g at P3, followed by P2 and P1 with 31 and 18.75 g, respectively. The survival rate of mud crabs for all treatments reached 100%. The results of the analysis of variance indicated a significant bet effect (P < 0.05) on the molting and weight growth percentage. The BNT test suggested that a dose of 150 ppm was the optimum treatment.

Large-bodied Panulirus ornatus lobsters are economically important because they are an aquatic biota. It is one of the most important commodities in the city of Tarakan. The aim is to analyze the growth patterns and mortality of P. ornatus from the West Waters of Tarakan City. Method using a quantitative descriptive. The purposive sampling method was used by dragging the gill net fishing gear to the P. ornatus lobster ground area, and the collection was carried out 16 times in 7 months (December 2021-July 2022). The results of P. ornatus showed that the male sex ratio was higher than the female. The growth model was allometrically negative, and the criteria for the condition index were fat and thin. The growth pattern of Model Von Bertalanffy males is slower than females. However, the growth rate to achieve asymptotic growth for males is faster than for females. The total mortality, catch mortality, and exploitation rate of males was higher than females. However, the mortality of the female nature was higher than that of males. P. ornatus should be managed in the waters of West Tarakan using the domestication and restocking technique to increase sustainability.

The Covid-19 pandemic has had a major impact on society, such as job losses, rising staples, and economic hardship. Prices of food needs that continue to increase and are not affordable have resulted in food problems, one of which is protein. One of the high-quality protein is protein from fish. Fish as a fishery commodity that is relatively easy to cultivate on a large industrial scale and household scale for food self-sufficiency is catfish (Clarias sp). The purpose of this activity is to add insight and knowledge of the community about budikdamber for food self-sufficiency. The method of implementing community service activities in Kampung Six is carried out by counseling and training methods on Budikdamber. In this training activity, a bucket with 40 liters of water and 20 catfish seeds was used. Maintenance was carried out for 60 days with ad satiation feeding three times a day. Observations were made on growth, survival and water quality. The results of the activity found that 93% of the community partners had understood about Budikdamber. Budikdamber maintenance by partner communities gets an absolute weight growth value of catfish of 14 g, catfish survival value of 75%, and 1 bunch of kale per bucket. Based on the results of this activity, it is hoped that there will be the provision of special land for Budikdamber as an example for people who want to develop in their respective yards.