The heavy metal pollution in marine environment is caused by industrial and mining waste (Gümgüm et al., 1994), geographical, industrial, agricultural, pharmaceutical, domestic, and atmospheric wastes (He et al., 2005;Tchounwou et al., 2012). According to Şireli et al. (2006) and WHO (2008), heavy metals such as lead, cadmium and cuprum are toxic, and are mostly found in marine environments. In addition, the heavy metals in marine environments cannot be degraded, and can accumulate in organisms through industrial, atmosphere, soil, water cycles and food chain processes (Ziyaadini et al., 2017;Rodríguez et al., 2015;Monsefrad et al., 2012;Naghshbandi et al., 2007).A lot of research has been conducted on the accumulation and distribution of heavy metals in marine environments and various biota, for example, the research on the heavy metal contamination in water and sediment conducted by (Bhuyan et al., 2017;Varol and Sen, 2012), and the research on heavy metal concentrations in Oysters (Crassostrea sp) in Setiu Wetlands, Terengganu (Shaari et al., 2016). Bioaccumulation of heavy metals in water

Abstract. Taniwel D, Leiwakabessy F, Rumahlatu D. 2020. Short Communication: Density and length-weight relationship of mudskipper (Periophthalmus spp.) in the mangrove area of Kairatu Beach, Maluku, Indonesia. Biodiversitas 21: 5465-5473. Mudskippers (genus Periophthalmus) fish species inhabit mudflat, sandy beaches, and mangrove areas. Their daily activities are influenced by tidal rhythms. The aim of this research was to identify the species of mudskipper, their density, and length-weight relationship of more density species in the mangrove area of ​​Kairatu beach, Maluku, Indonesia. This research was conducted from July to August 2018, 3 sampling sites using purposive sampling technique. The physical-chemical parameters of environmental conditions (temperature, dissolved oxygen, salinity, and pH of water) were measured directly on location (in-situ), while the different mudskippers species present in the study sites were identified in the laboratory at the Pattimura University. Quantitative data on population density and length and weight of individuals were obtained for four Periophthalmus species. The physical-chemical parameters of environmental conditions in the three sampling stations were within the range of optimal values previously obtained for mudskipper species. The temperatures ranged from 30.01-30.05 oC, the dissolved oxygen ranged from 7.1-7.5 mg/L, the pH ranged from 7.3-7.5, and the salinity ranged from 5-7 ‰. The four mudskippers species identified in the sampling sites were (in density descending order): Periophthalmus argentilineatus (5.05 ind/m2), P. gracilis (1.5 ind/m2), P. malaccensis (0.4 ind/m2) and P. kalolo (0.3 ind/m2). The results of the regression analysis showed that there was no significant relationship between physical-chemical parameters to mudskipper density. The results of the length-weight relationship of the two most abundant species P. argentilineatus and P. gracilis a negative allometric length-weight relationship (b<3), while the P. kalolo and P. malaccensis indicated a positive allometric growth type (b>3).

Research was conducted to determine the effect of the method and duration of ripening on the content of β-carotene of Fe’i banana, as well as determine the method and duration of ripening is effective in maintaining the nutritional value of Fe’i Banana. Through laboratory experimental with randomized complete design consisting of 19 groups of treatments and three repetitions, the data obtained were analyzed using statistical tests ANOVA and continued with Duncan test. Results of the analysis showed that method ofripening statistically significant difference (p <0,05) on the content of β-carotene in the banana sticks sky. Long ripening length statistically significant difference (p <0, 05) on the content of β-carotene in the Fe’i Banana. Grilled ripening method is more effective against β-carotene content in the Fe’i Banana and takes1 0 minutes of ripening length more effectively on the content of β-carotene on a Fe’i Banana.

Background: This study aims to determine the effect of the application of the learning model of the horay course review to improve student learning outcomes of teaching material on the classification system of living things in class X of SMA Negeri 14 Ambon. Method: Samples from this study were students of class X1 with 23 students. This type of research is descriptive research to see student learning outcomes which consists of 3 factors, namely physical, cognitive and psychomotor. The instruments used in this study were test instruments in the form of initial tests and final tests. Results: The results of this study show that there is a significant effect by using the learning review horay learning model on improving student learning outcomes during the implementation of the learning model of the course review horay. Conclusion: Based on the results of the study it can be concluded that the use of the Course Review Horay learning model can improve the learning outcomes of class X1 students at SMA Negeri 14 Ambon. This can be seen from the results of the final test which is very satisfying from the results of the initial test. Presentation of student grades during the initial test is 13% and the final test score reaches 100%.

Background: One reason students tend to score below the KKM is the lack of understanding of the material provided by teachers and students less actively involved in the learning process. Method: This research uses Problem Based Instruction (PBI) model and the Student Sheet (LKS) media. This study looks at the improvement of students' learning outcomes on the concept of the VIII grade system of SMP Negeri 5 Ambon by applying the Problem Based Instruction based LKS model. This research was conducted at SMP Negeri 5 Ambon. Result: Implementation of Problem Based Instruction based learning model (LKS) based on LKS can improve biology learning result. Conclusion: Implementation of Problem Based Instruction based learning model can improve student learning outcomes on the concept of Respiratory System of Class VIII4 SMP Negeri 5 Ambon.