Tujuan dari penelitian ini adalah untuk mengujii dan membandingkan pengaruh perbedaan suhu terhadap tingkat produktivitas induk ikan Guppy. Penelitian merupakan eksperimental, dengan menggunakan Rancangan Acak Lengkap (RAL). Ikan Guppy yang digunakan memiliki berat rata-rata 1,1 g. dipelihara selama 40 hari empat perlakuan tiga ulangan yaitu S0 (26 0C), S1 (28 S2 (30 0C) S3 (32 0C). Hasil menun...

DAPI staining of the metaphase chromosomes pretreated with barium hydroxide generates a C-like banding pattern. In this work a protocol for visualizing similar pattern at the synaptonemal complex (SC) spreads after immunostaining is suggested. This method was used to visualize centromeric and sex heterochromatin at the SC spreads of guppy fish (Poecilia reticulata Peters, 1859). The efficiency ...

Quantitative structure-toxicity relationships were developed for the prediction of aqueous toxicities for Poecilia reticulata (guppy) using the CODESSA treatment. A two-parameter correlation was found for class 1 toxins with R(2) = 0.96, and a five-parameter correlation was found for class 2 toxins with R(2) = 0.92. A five-parameter correlation for class 3 toxins had R(2) = 0.85. The correlatio...

Compared to egg-laying fish, live-bearing species invest much energy in the production of fewer, yet relatively more developed offspring. Although in many live-bearing species (e.g. mammals) viviparity is combined with extensive brood care after birth, this is not the case in the Poeciliidae, a family of freshwater fish that includes the well-known guppy (Poecilia reticulata), mollies (subgenus...

The authors examined the relationships between 2 "personality" dimensions (Approach and Fear Avoidance) and 2-way active avoidance learning performance in the guppy (Poecilia reticulata). Contrary to expectations (based on prior rodent studies), higher fearfulness facilitated both earlier appearance and acquisition of the shuttlebox avoidance responses, especially in the less exploratory and ac...

Alpha-cypermethrin is a synthetic pyrethroid insecticide used to control pests in domestic, industrial and agricultural situations. Adult male guppy fish (Poecilia reticulata standard test species) were selected for the bioassay experiments. The experiments were performed in four series and the 96-h LC50 value was determined for guppies. The acute toxicity experiments were carried out by static...

In many species, females mate with multiple partners, meaning that sexual selection on male traits operates across a spectrum that encompasses the competition for mates (that is, before mating) and fertilizations (after mating). Despite being inextricably linked, pre- and postcopulatory sexual selection are typically studied independently, and we know almost nothing about how sexual selection o...

Differences in the exploratory behavior and social tendencies of 29 guppies (Poecilia reticulata) in 2 domains of situations involving novelty and conspecincs were investigated. Consistent individual differences were found in most behavior patterns. Two behavioral dimensions (Activity Exploration and Fear Avoidance) were identified in the novelty situations. Likewise, 2 dimensions (Sociability ...

This study was conducted to analyse the use of coconut water doses achieve a higher percentage males in guppy breeding and how it affects survival fry. The search took place Mertoyudan, Magelang district between November 2021 January 2022. research plan completely randomized design with 4 treatments replicates. Treatments this were immersed gravid females at 0%; 50%; 55%; 60% solution concentra...

Se hace una contribución al conocimiento taxonómico, composición y distribución de los peces que habitan en sistemas agua dulce la provincia Holguín. El periodo muestreo fue del año 2019 2021, se realizó 189 sitios. registraron 43 especies, comprendidas clase, 13 órdenes, 20 familias 36 géneros. identificaron 26 especies estrictas 11 periféricas. nueve endémicas, introducidas 23 autóctonas, den...