Abstract. This study examined the selectivity of ethyl acetate extract of putat air (Barringtonia racemosa) in controlling Pomacea canaliculata compared to local catfish (Clarias batrachus). Five concentration of putat air (25, 50, 100, 200, and 400 ppm) with triplicate were tested in this study. The powder of putat air kernel was extracted through increasing the polarity of solvent, i.e. dichloromethane, ethyl acetate, and methanol. The mortality data were analyzed using Trimmed Spearman Karber (TSK) program version 1.5. The selectivity value was calculated based on LC50 values obtained from TSK. The results showed that (1) LC50 values of putat air's kernel extract of putat air to P. canaliculata and C. batrachus were 25.00 and 87.06 ppm, respectively, (2) the selectivity value of putat air's kernel extract as molluscicide of P. canaliculata was 3.48. Key words: Pomacea canaliculata, local catfish (Clarias batrachus), putat air (Barringtonia racemosa).

Like other fish, Nile tilapia (Oreochromis niloticus) is one species that potentially exposed to pollutants, including lead (Pb). However, the impact of Pb exposure on hatching rate and larvae development of Nile tilapia is still not investigated. Therefore, this study aimed to examine the toxic effect of Pb exposure on hacthing rate and larvae abnormalities of Nile tilapia. A total of 2,400 fertilized eggs of Nile tilapia was distributed to control and 3 treatment group namely: treatment A (0.21 mg/L PbCl2), treatment B (0.42 mg/L PbCl2) and treatment C (0.63 mg/L PbCl2) with triplicate. The exposure period lasted for ten days. Cumulative hatching rate, survival rate, malformation rate, heart rate, body length, total lead content and deformities of larvae were analyzed. The results showed that increasing Pb concentration significantly increased malformation rate, heart rate, and total Pb content in Nile tilapia larvae. The highest malformation rate, heart rate and total lead content observed in treatment C were 3.4%, 115.6 beats/minute and 4.80 mg Pb/kg, respectively. Furthermore, Pb was affect several deformities of Nile tilapia larvae including lordosis, kyphosis, and curved tail. Otherwise, exposed to lead up to concentration 0.63 mg/L PbCl2 have no significant effect on cumulative hatching rate, survival rate and body length in Nile tilapia.

The mudskipper is one of the fishes that inhabit mangrove ecosystems. Its growth and distribution is influenced by food sources, tidal action, and environmental factors. The aims of the research were to analyze the growth patterns and condition factors of the mudskipper, Periophthalmus gracilis Eggert, inhabiting mangrove ecosystem rehabilitation areas in Banda Aceh and Aceh Besar, Aceh Province, Indonesia. The research period in these mangrove ecosystems was from August to October 2020. The research was conducted at three sampling stations using the purposive sampling method to determine their location. The mudskippers caught at each station were identified and body length and weight were measured. Physicochemical water parameters were measured directly at the sampling stations to determine the suitability of them for mudskipper growth and occurrence. The mean total lengths (TL) and weights (W) of the mudskipper specimens caught at stations 1, 2, and 3 were 52.0 mm and 6.2 g; 53.5 mm and 6.4 g, and 56.0 mm 6.7 g, respectively. The growth patterns of the mudskippers from the three sampling stations were negative (b < 3), and Fulton’s condition factor (K) exceeded 1. The K value at stations 1, 2, and 3 ranged from 1.28 to 3.62, 1.15 to 3.56, and 1.05 to 3.89, respectively. The relative weights (Wr) at the three stations were 103.8 ± 26.5, 104.3 ± 29.3, and 104.1 ± 28.2, respectively. Wr >100 indicated that there was sufficient food availability, low predator density, and the environment was in equilibrium. Furthermore, physicochemical water parameters at the study stations were suitable and within optimal ranges for the mudskipper. Significant differences in total length were noted among specimens from the three stations (P < 0.05); however, no significant differences in body weight were noted at them (P > 0.05).

Shark fisheries in Aceh are not supported by the availability of research-based data and information that needed to support the preservation and development of this resource. The purposes of the study were to assess the biological aspects including shark species identify and their status in IUCN, length distribution, sex ratio, and maturity stage of male shark. This study was conducted from August to October 2017 in the Fishing Port of Kutaraja, Banda Aceh. The observation survey of fish landing sites was conducted to collect the catch species composition, total length of each individual, sex, and maturity stage of male genital of shark (clasper). The results showed there are 17 species of sharks caught by some fishing gears (n = 318). Mean total length, fork length, and standard length are 122.90 cm, 110.77 cm, and 86.50 cm, respectively. The sex ratio of dominated species (Carcharhinus sorrah, Sphyrna lewini, and Alopias pelagicus) showed not significantly difference between males and females, based on Chi-square test. The percentage of male shark maturity for each category (NC, NFC, FC) is 52%, 13%, and 35%, respectively. The percentage of the IUCN status (threatened rare, threatened with extinction, and almost threatened) of collected species are 12%, 29%, and 41%, respectively.

This study aims to determine the application of regulations related to work safety equipment and its availability on purse seine vessels in the Ocean Fisheries Port (PPS) of Kutaraja, Banda Aceh, and to find out fishermen's perceptions of the importance of work safety equipment. This research was conducted in July 2018, using the method of direct surveys and interviews concerning existing national regulations. Data were analyzed descriptively and linear regression analysis through SPSS program. The results showed that from all samples of vessels 11 GT-> 61 GT (n = 21) the percentage of the presence or application of safety devices on purse seine vessels was 63%. In the 11 GT - 20 GT category the existence or application of safety equipment is 45% (n = 3), on the 21 GT - 30 GT vessel is 60% (n = 6), on the 30 GT - 50 GT ship is 65% (n = 7), on vessels 51 GT - 60 GT is 57% (n = 3) and on vessels larger than 61 GT is 86% (n = 2). In general, fishermen already understand the importance of work safety equipment, but the availability and number of occupational safety equipment on the ship are inadequate. Safety tools (independent) work influences the perception of fishermen (dependent) of only 1.83%, the rest of 98.17% is influenced by other factors outside the availability of work safety tools.