Se describe el desarrollo larval del paiche Arapaima gigas en base a la caracterización de individuos nacidos y manejados en un sistema de recirculación en Iquitos, Loreto (Perú). Cada dos horas se tomaron fotografías a grupos de seis larvas con el apoyo de cámaras conectadas a microscopios y estereoscopios. Las fotografías fueron analizadas en Image J obteniéndose medidas de longitud de estructuras y órganos según éstas iban apareciendo y desarrollándose en cada fase. Se registró el tiempo de aparición de cada nueva estructura. Las larvas fueron caracterizadas desde la eclosión hasta las 196 horas post eclosión (hpe). Las larvas de paiche miden 14.46 ± 0.34 mm al momento de la eclosión (0 hpe) y alcanzan 19.12 ± 0.55 mm  a los 196 hpe. El diámetro horizontal del saco vitelino significa el 82.8% de la longitud total del cuerpo de la larva al momento de la eclosió...

The study focuses on the Huachana lake, a vulnerable ecosystem in the Peruvian Amazon region that receives wastewater from the city of Iquitos. Despite its significance in ichthyology and its role as a type locality for various species, water bodies near Iquitos face threats. While a portion of the ichthyological diversity in the Loreto region is known, the Huachana lake had never been subject to sampling, making this study the first to examine fish diversity in this aquatic environment. A total of 52 fish species from 5 orders, 20 families, and 39 genera were identified. The Characiformes present the greatest species richness (30 species), followed by Cichliformes (12 species). Cichlidae and Characidae are the families richest in species. No species are endangered according to the IUCN; the majority are considered of least concern. The study also identified ornamental and commercial spe...

The present work corresponds to a fish inventory, carried out between August and September 2019, in three sampling sites in the Pintuyacu stream, a tributary of the Itaya River basin, in the Peruvian Amazon. Based on 504 individuals analyzed, 117 species were identified, corresponding to 33 families and 8 orders. The most diverse order was Characiformes (65 species, 55.6%), followed by Siluriformes (31 species, 26.5%). At the Characidae family level, it presents the highest species richness with 24 species (20.5%). The most abundant species were Stethaprion erythrops (13.1%, 66 individuals), Knodus smithi (13.1%, 66 individuals) and Bujurquina peregrinabunda (6.2%, 31 individuals). Species for ornamental and consumer use were recorded. No threatened species were recorded and most were classified as Least Concern (LC), according to IUCN criteria. The present study is the first to present ...

The objective of the study was to determine the efficacy of paiche pituitary extract (EPP) in the induction of Brycon amazonicus "red-tailed tarpon". 27 pairs of B. amazonicus were used (1.94 ± 0.24 kg of weight and 50.78 ± 2.22 cm of length in males and 2.28 ± 0.38 kg of weight and 49.32 ± 11, 39 cm in length in females). The hormonal inducers of EPP (10% and 90% of the total) will be applied in two doses, with an interval of 12 hours. Three hormonal doses of EPP are applied, in the case of females: T1: 3.0 mg/kg, T2: 4.0 mg/kg and T3: 5.5 mg/kg. In males: T1: 0.5 mg/kg, T2: 1.0 mg/kg, T3: 1.5 mg/kg. The females induced with EPP responded positively to ovulation, finding significant differences (P<0.05), with T1 and T2 reaching the best ovulation rates with 77.73% and 88.87% respectively, regarding the hatching rate, differences were also found. T2 the best with 40.21%. The males of...

El presente estudio se llevó a cabo en las instalaciones del Programa de Investigación para el Uso y conservación del Agua y sus Recursos (AQUAREC), del Instituto de Investigación de la Amazonía Peruana (IIAP), situado a la margen derecha del Km. 4.5 de la Carretera Iquitos – Nauta, Departamento de Loreto, entre los meses de Julio y Noviembre del 2015, con el objetivo de evaluar la influencia del probiótico comercial EM® CAMARÓN en la dieta, sobre el crecimiento y composición corporal de juveniles de sábalo cola roja Brycon cephalus, criados en corrales. Un total de 120 juveniles con longitud y peso inicial de 8.20 ± 0.73 cm y 5.74 ± 1.50 g respectivamente, fueron cultivados en 12 corrales, sembrando 10 individuos en cada unidad experimental (9 m3) a una densidad de 1.1 pez por m2, por un periodo de 120 días. Los peces fueron alimentados con una dieta balanceada de 42 % de...

Se describe el desarrollo larval del paiche Arapaima gigas en base a la caracterización de individuos nacidos y manejados en un sistema de recirculación en Iquitos, Loreto (Perú). Cada dos horas se tomaron fotografías a grupos de seis larvas con el apoyo de cámaras conectadas a microscopios y estereoscopios. Las fotografías fueron analizadas en Image J obteniéndose medidas de longitud de estructuras y órganos según éstas iban apareciendo y desarrollándose en cada fase. Se registró el tiempo de aparición de cada nueva estructura. Las larvas fueron caracterizadas desde la eclosión hasta las 196 horas post eclosión (hpe). Las larvas de paiche miden 14.46 ± 0.34 mm al momento de la eclosión (0 hpe) y alcanzan 19.12 ± 0.55 mm  a los 196 hpe. El diámetro horizontal del saco vitelino significa el 82.8% de la longitud total del cuerpo de la larva al momento de la eclosió...

The study focuses on the Huachana lake, a vulnerable ecosystem in the Peruvian Amazon region that receives wastewater from the city of Iquitos. Despite its significance in ichthyology and its role as a type locality for various species, water bodies near Iquitos face threats. While a portion of the ichthyological diversity in the Loreto region is known, the Huachana lake had never been subject to sampling, making this study the first to examine fish diversity in this aquatic environment. A total of 52 fish species from 5 orders, 20 families, and 39 genera were identified. The Characiformes present the greatest species richness (30 species), followed by Cichliformes (12 species). Cichlidae and Characidae are the families richest in species. No species are endangered according to the IUCN; the majority are considered of least concern. The study also identified ornamental and commercial spe...

The present work corresponds to a fish inventory, carried out between August and September 2019, in three sampling sites in the Pintuyacu stream, a tributary of the Itaya River basin, in the Peruvian Amazon. Based on 504 individuals analyzed, 117 species were identified, corresponding to 33 families and 8 orders. The most diverse order was Characiformes (65 species, 55.6%), followed by Siluriformes (31 species, 26.5%). At the Characidae family level, it presents the highest species richness with 24 species (20.5%). The most abundant species were Stethaprion erythrops (13.1%, 66 individuals), Knodus smithi (13.1%, 66 individuals) and Bujurquina peregrinabunda (6.2%, 31 individuals). Species for ornamental and consumer use were recorded. No threatened species were recorded and most were classified as Least Concern (LC), according to IUCN criteria. The present study is the first to present ...

Trichopodus trichopterus (Pallas, 1770) es una especie nativa del sudeste asiático que se introdujo en el Perú como un controlador biológico de los vectores de la malaria y para la ornamentación. Teniendo en cuenta que las especies hospedadoras exóticas pueden co-introducir sus parásitos en ambientes naturales, el presente estudio tiene como objetivo identificar los monogenoideos que parasitan las branquias del gourami de los tres puntos, dando una descripción morfológica de sus especies de parásitos y sus índices parasitológicos. Treinta especímenes de T. trichopterus fueron capturados en julio de 2018 de un estanque natural en Iquitos, Perú. Las muestras se sacrificaron y luego se analizaron en el Laboratorio de Parasitología y Sanidad Acuícola del Instituto de Investigaciones de la Amazonía Peruana (IIAP), Iquitos, Perú. Se encontró al monogenoideo Trianchoratus acle...

The effect of the chlorophytes Scenedesmus sp and Chlorella sp used as feed on the growth of the native cladoceran Ceriodaphnia sp were studied. Three treatments with three repetitions for each chlorophyte were used: T1 = 5 ml.L-1 (25 x 106 cells), T2 = 10 ml.L-1 (50 x 106 cells) and T3 = 15 ml.L-1 (75 x 106 cel). The physical and chemical characteristics of the water in the containers varied between 28.4 and 28.6 °C, pH between 6.57 and 7.36 and the dissolved oxygen between 6.34 and 6.66 mg/l between treatments. The results showed that Ceriodaphnia sp prefers the Chlorella sp microalgae, where diets with a concentration of 10 ml.l-1 (50 x 106 cells) were better than the other diets.

The effect of the chlorophytes Scenedesmus sp and Chlorella sp used as feed on the growth of the native cladoceran Ceriodaphnia sp were studied. Three treatments with three repetitions for each chlorophyte were used: T1 = 5 ml.L-1 (25 x 106 cells), T2 = 10 ml.L-1 (50 x 106 cells) and T3 = 15 ml.L-1 (75 x 106 cel). The physical and chemical characteristics of the water in the containers varied between 28.4 and 28.6 °C, pH between 6.57 and 7.36 and the dissolved oxygen between 6.34 and 6.66 mg/l between treatments. The results showed that Ceriodaphnia sp prefers the Chlorella sp microalgae, where diets with a concentration of 10 ml.l-1 (50 x 106 cells) were better than the other diets.

In the Peruvian Amazon, species of the Cichlidae constitute a valuable resource for fisheries and aquaculture activities. Due to the importance of cichlids in this region and the constant interest in conduct studies focused on the biodiversity of monogenoids, the present study aimed to present a checklist of monogenoids from the gills of cichlids with importance in aquaculture in the Peruvian Amazon. Thirteen species of cichlids were analyzed from November 2020 to May 2023 from different water bodies in the Peruvian Amazon. There were identified five species of Gussevia Kohn & Paperna, 1964; eight morphospecies of Gussevia (Gussevia sp. 1 to sp. 8); four species of Sciadicleithrum Kritsky, Thatcher & Boeger, 1989; eight morphospecies of Sciadicleithrum; one species of Biotodomella Morey, Arimuya & Boeger, 2019 and one species of Trinidactylus Hanek, Molnár & Fernando, 19...

El canal del Puinahua, ubicado en la Amazonía peruana, es una zona de alta biodiversidad ictiológica y una importante área pesquera. Este canal, que forma parte de la cuenca del río Ucayali, alberga una rica diversidad de peces, con estudios recientes que han incrementado significativamente el número de especies registradas en la zona. A pesar de su importancia económica y ecológica, la información sobre las poblaciones de peces y las zonas de desove es limitada. El presente estudio realiza un diagnóstico del recurso pesquero en el canal del Puinahua, abordando cuatro aspectos principales: las percepciones locales sobre el estado de los recursos pesqueros, la evaluación biológica de las especies capturadas, el registro de la riqueza y abundancia de peces, y el análisis del ictioplancton mediante técnicas de identificación molecular (Barcoding). Además, se destacan las infl...