The catch production of this species has declined since 2015. This study aims to assess growth, mortality, and exploitation rate parameters of P. leopardus taken from Napan Yaur water, Cenderawasih Bay National Park (CBNP), Indonesia. The data were collected during periods of February to March 2016. Growth and mortality parameters were analyzed using von Bertalanffy method. Some fish samples used in this study was 123 individuals, with the average length of 32.34 ± 5.13 cm, the maximum length of 48.00 cm and minimum length of 24.5 cm. The von Bertalanffy analysis showed that the growth coefficient (K) was 0.34 year-1 , L∞ was 47.78 cm and t 0 was-0.09 year-1. The estimation of total mortality (Z) was 1.61 year-1 , natural mortality (M) was 0,75year-1 for fishing mortality (F) was 0.86 year-1 , and exploitation rate (E) was 0.53 year-1. The results indicated that most P. leopardus caught were at the pre-maturity size (age) and have been exploited at slightly above its optimum exploitation level. Nevertheless, P. leopardus is categorized as fast growing and long-lived fish species. These findings are important to fisheries management and conservation authorities to fish exploitation in the future.

For any simple undirected graph G(V, E), a map f : V ⋃ E → {1, 2, …, k} such that for any different edges xy and x’y’ their weights are distinct is called an edge irregular total k-labeling. The weight of edge xy is defined as the sum of edge label of xy, vertex label of x and vertex label of y. The minimum k for which the graph G has an edge irregular total k-labeling is called the total edge irregularity strength of G and is denoted by tes(G). In this paper, we determine the exact value of the total edge irregularity strength of odd arithmetic book graph Bn (C 3, 5, 7, …2n+1) and even arithmetic book graph Bn (C 4, 6, 8, …, 2n+2) of n sheets. We found that the tes of odd arithmetic book graph Bn (C 3, 5, 7, …, 2n+1) of n sheets is equal to the ceiling function of n 2 + n + 3 3 and the tes of even arithmetic book graph Bn (C 4, 6, 8, …, 2n+2) is equal to the ceiling function of n 2 + 2 n + 3 3 .

Abstract. Palupi T, Riyanto F. 2020. Seed coating with biological agents to improve the quality of rice seeds contaminated with blast pathogens and increase seedling growth. Biodiversitas 21: 683-688. The aim of this research were (1) to evaluate the compatibility of five biological agents (SP21, SP31, RP21, TP12, and TP11), (2) to evaluate the physical and physiological quality of rice seeds contaminated with Pyricularia grisea after being treated with seed coating enriched with biological agents, (3) to evaluate the effectiveness of seed coating on the incidence of blast disease and seedling growth. The first experiment tested the compatibility of five bacterial antagonists on the PSA plates. There were eight treatments in the second experiment namely seed coating enriched with SP21+SP31; SP21+RP21; SP21+TP12; SP31+RP21; RP21+TP11; fungicides; positive control (rice seeds contaminated with blast), and negative control (healthy seeds), and seven treatments in the third experiment which were the same as in experiment 2 without negative control. Parameters observed in the second experiment were: seed germination, vigor index, and growth rate, while parameters observed in the 3rd experiment were the incidence rate of blast disease and plant height. The results of experiment 1 showed that isolates SP21+SP3, SP21+RP21, SP21+TP12, SP31+RP21, and RP21+TP11 had good growth compatibility without antagonism, and they can be used as biocontrol agents. Results of experiment 2 showed that seed coating enriched with SP21+SP31 isolates has the potential to improve the physical and physiological quality of the seeds. Results of experiment 3 showed that seed coating enriched with RP21+TP11 had no incidence of blast disease up to 4 weeks after planting.

No abstract

Abstract. Palupi T, Pangaribuan F, Hearnes, Riyanto F, Wasian, Zulfita D. 2020. Morphological and agronomical characters of four black rice varieties from West Kalimantan, Indonesia. Biodiversitas 21: 1065-1073. The black rice paddy is a variety of rice known to have anthocyanin content which is beneficial to human health. Yet, the black rice paddy is relatively rare to find as not all rice-growing areas develop and plant black rice. West Kalimantan has several potential black rice varieties which are potentials as genetic resources to create a new black rice variety in plant breeding programs. This research was aimed to describe the morphological and agronomical characteristics of four black rice varieties from West Kalimantan, namely Nanga Taman, Mukok, Senakin, and Ensalang. The study was conducted at the experimental garden of Agriculture Faculty, University of Tanjungpura, Pontianak using Completely Randomized Design. Each variety consisted of six replications, and each replication consisted of 3 samples. We observed 12 characters of the vegetative phase and 21 characters of the generative period. The four varieties had similarities in 13 characters and differences in 20 characters. The results showed that the four black rice had superior properties such as the stem angle and the angle of the leaves is upright so that it reduces interference from bird pests. Among them, the Senakin variety had an advantage over the three other varieties in terms of plant height, age, the number of productive tillers, and weight of grains.