Some freshwater crabs can be found from brackish up to the freshwater habitats. The crab of the family Varunidae, i.e. Varuna litterata (Fabricius, 1798) has unique migration distribution pattern because it is a euryhaline and catadromous species. The Varunid species is distributed throughout the Indo Pacific region. The purpose of this study was to determine the existence of V. litterata in Meru Betiri National Park (MBNP). Specimens were collected along the rivers passing Andongrejo and Bandealit resorts in MBNP by road sampling method on various habitats, and from lowland up to the middle stretch. The collected specimens were preserved in 70% ethanol. V. litterata was found mainly in settlements at lowland area. This species can migrate to the freshwater as far as 31 Km from the coast. During the collecting time, large females were found in coastal area showing this species association with marine life.

Freshwater fish diversity is the number of fish species found in freshwater areas. This research is an exploratory study aimed at the diversity of freshwater fish in the Sanenrejo and Wonoasri Resort’s Rivers of Meru Betiri National Park. Fishes were caught using gill nets with mesh sizes 0.5 inch and handnet The level of diversity of freshwater fish in the Sanenrejo and Wonoasri Resorts is classified as being moderate with the diversity index values in the Sanenrejo and Wonoasri Resorts respectively 1.5902 and 2.2323 while the overall index value is 2.4102. Freshwater fish found consisted of 15 species, namely: Barbodes binotatus, Trichopodus trichopterus, Neovespicula depressifrons, Rasbora lateristriata, Planiliza subviridis, Orechromis niloticus, Eleotris melanosoma, Dermogenys pusilla, Periopthalmus argentilineatus, Pterygoplichthys pardalis, Channa gachua, Butis butis, Nemacheilus fasciatus, Siycopterus cyanocephalus, and Monopterus albus.

National Park plays important role in maintaining natural ecosystems such as freshwater ecosystems. Meru Betiri National Park is loacted in southern East Java, it covers two regencies, Banyuwangi and Jember. A recent survey was carried out in two resorts, Bandealit and Andongrejo, to study the diversity of freshwater gastropoda. We had collected 86 specimens which consisted of five families, seven genera, and nine species. Seven species were found from Andongrejo and four species were found from Bandealit. River in the Bandealit primary forest area had the highest diversity with four species. The relations between diversity and environmental conditions will be discussed briefly in this paper.

Freshwater ecosystems are habitat for macroinvertebrate, fish and reptile groups. One of the macroinvertebrates that can be found in freshwater habitat is shrimp which belongs to the class of Crustaceae, order of Decapoda. This study aims to determine diversity and the abiotic conditions of freshwater shrimp habitat. Determination of sampling locations was done by purposive sampling based on the habitat type of freshwater shrimp and followed by road sampling that takes the straight path from the designated sampling location. The tools used to catch freshwater shrimp are traps and tray nett. The results obtained in the Bandealit river of Meru Betiri National Park were five species of freshwater shrimp consisting of 2 families. The diversity index of freshwater shrimp in the Bandealit river was classified as moderate by the analysis of diversity index. Meru Betiri National Park has ideal abiotic conditions for freshwater shrimp life.

Crabs are macrobenthos with characters that are attached to or resting on a base or live on basic sediments. The role of crabs in the ecosystem includes converting nutrients and enhancing mineralization, increasing the distribution of oxygen in the soil, helping carbon life cycles, and providing natural food for various types of aquatic biota. This research was conducted in the estuary area of ​​the Meru Betiri National Park (TNMB) Resort Bandealit. Identification results from 37 individual crabs at the Estuary Resort Bandealit Meru Betiri National Park (TNMB) obtained 5 species from 2 families (Portunidae and Sesarmidae). In the family Portunidae, there are 3 types, namely Scylla tranquebarica, Scylla paramamosain, and Scylla olivacea. Whereas in the family Sesarmidae found 2 types, namely Parasesarma pictum and Parasesarma cognatum. Keywords: Crab, Bandealit Resort, Identification

Penelitian ini bertujuan untuk mendeskripsikan miskonsepsi pada siswa SMP pada pokok bahasan sistem organisasi kehidupan. Waktu penelitian dilaksanakan pada semester genap tahun ajaran 2019/2020. Subjek penelitia yaitu siswa kelas VII yang sudah menerima materi sistem organisasi kehidupan.Teknik pengumpulan data dilakukan dengan menggunakan tes diagnostik berbentuk essay. Soal yang diberikan berkaitan dengan materi sistem organisasi kehidupan berjumlah 15 soal. Instrumen untuk mendukung penelitian yaitu berupa observasi kegiatan pembelajaran dan wawancara. Data yang didapatkan dari hasil penelitian dianalisis berdasarkan kriteria derajat pemahaman konsep siswa yaitu memahami konsep, miskonsepsi dan tidak memahami konsep. Hasil penelitian diperoleh persentase miskonsepsi tertinggi adalah tentang sistem pencernaan dengan rata-rata sebesar 57,1%, sedangkan miskonsepsi terendah pada konsep tentang system ekskresi sebesar 17,9%. Faktor-faktor penyebab terjadi miskonsepsi pada pokok bahasan sistem organisasi kehidupan yaitu berasal dari kesalahan siswa itu sendiri dan metode pembelajaran yang digunakan guru.

Feed according to nutrient requirements is a major aspect to support optimum growth of C. quadricarinatus. Commontly, farmers still use fish flour as a source of feed nutrients. However, the price of fish flour often fluctuates. While, T. molitor L. flour has potential to be an alternative feed ingredient for C. quadricarinatus because of its high nutrient content. This study aims to determine the effect of feed based on T. molitor L. flour on C. quadricarinatus growth, which is measured by parameters of wet biomass (gram/week), dry biomass (gram/week), carapace length (mm/week), FCR, and FUE (%/week) during the research period. The research was carried out in March-September 2021 at the Animal Laboratory of the Biology Education Study Program, University of Jember. The test animals used were C. quadricarinatus seeds aged 80 days with wet biomass (4±0.3grams) and carapace length (23±0.6mm). This study was an experimental design using a completely randomized design, consisting of 2 treatments 1 control with 3 replications each. The results showed that feeding with flour-based T. molitor L. had a significant effect on the growth of wet biomass (p=0.047), dry biomass (p=0.046), and carapace length (p=0.011). However, FCR and FUE showed no significant effect (p=0.089; p=0.162 respectively).

The granules of sugar apple seeds extract (Annona squamosa L.) have been taken as the natural larvacide an economical in eradicating mosquito flicks of Aedes aegypti L. because of its the content of toxic compounds such as acetogenin, alkaloids, and flavonoids. In its use it is feared to cause toxic in the environment, especially the class of mammals as non-target animals, especially kidney organ. The kidney is an organ that is susceptible to toxic effects, since it receives 25-30% of the blood circulation to be cleaned, so that as a filtration organ there is a possibility of pathological changes. This study aims to determine the effect granules of sugar apple seeds extract (Annona squamosa L.) on the histology of white rat (Rattus norvegicus B.). Kidney histology observed as fat degeneration, hydrophic degeneration, and necrosis of tubular cells occurred in one field of view. The concentration given was 1 mg, 2 mg, 4 mg, and 8 mg while the negative control induced 2 ml aquades and positive control using abate 100 mg for 14 days with sonde method. The analysis used in this research is descriptive analysis with scoring. The results showed that granules of sugar apple seeds extract did not give effect to histology of white rat (Rattus norvegicus B.).