Hypophysation was the first known induced reproduction technique in fish farming and, it continues being applied to this day. The study aimed to evaluate the reproductive response of adult males and females of black-finned pacu Colossoma macropomum, induced with injections of paiche pituitary extract (EPP) and carp pituitary extract (CPE). We used ten females and ten males with an average body weight of 6,81 ± 1,86 kg and 6,59 ± 2,34 kg, respectively. Four females were treated with carp pituitary extract (CPE) at 6,0 mg/kg body weight, while another six received paiche pituitary extract (PPE) at 3,5 mg/kg body weight. In both cases, the dose was administered in two injections (10% at the beginning and 90% twelve hours later). Four males were induced with EPC and six with EPP at 1 mg/kg body weight administered in two 50% doses simultaneously as the females. The females induced with the...

Fishes of fish farming importance in the Peruvian Amazon such as Arapaima gigas, Osteoglosom bicirrhossum, Colossoma macropomum, Piaractus brachypomus, Prochilodus nigricans, Brycon amazonicus, Myloplus schomburgkii and Pseudoplatustoma punctifer are parasitized by protozoan and metazoan parasites with different levels of infection/parasitic infestation. Given the importance of fish farming of species for human consumption in the Amazon and the possible parasitic conditions, the main objective of this study was to know the level of parasitism through the calculation of parasitological indices in native fish species of the Peruvian Amazon. The objective was to identify the parasite species, characterize them morphologically and get information for recognizing the characteristic symptoms of each identified parasite. In the present study, samples of fish species acquired from fish farming c...

Hypophysation was the first known induced reproduction technique in fish farming and, it continues being applied to this day. The study aimed to evaluate the reproductive response of adult males and females of black-finned pacu Colossoma macropomum, induced with injections of paiche pituitary extract (EPP) and carp pituitary extract (CPE). We used ten females and ten males with an average body weight of 6,81 ± 1,86 kg and 6,59 ± 2,34 kg, respectively. Four females were treated with carp pituitary extract (CPE) at 6,0 mg/kg body weight, while another six received paiche pituitary extract (PPE) at 3,5 mg/kg body weight. In both cases, the dose was administered in two injections (10% at the beginning and 90% twelve hours later). Four males were induced with EPC and six with EPP at 1 mg/kg body weight administered in two 50% doses simultaneously as the females. The females induced with the...

En este trabajo se registra una nueva especie de Monogenoidea, Cosmetocleithrum amazonensis n. sp., parasitando las branquias del silurido Auchenipterichthys coracoideus (Eigenmann & Allen, 1942). Cosmetocleithrum amazonensis n. sp. se distingue de todas las demás especies congéneres por poseer un órgano copulador masculino (OCM) tubo alargado, esclerotizado y sinuoso, con espirales poco definidos, base con borde esclerotizado y con la región distal apoyada sobre la pieza accesoria. La pieza accesoria es una placa única, robusta y no articulada con el OCM. En este estudio se presenta el tercer registro de una especie de Monogenoidea en un hospedero Auchenipteridae (Siluriformes) del Perú. Publicación registrada en Zoobank/ZooBank article registered:LSIDurn:lsid:zoobank.org:pub:A2885133-CCFE-45FE-B97C-21C2C128FD5DActo nomenclatural/nomenclatural act:Cosmetocleithrum amazonensis...

Ponds covered with duckweeds release nutrients rapidly, causing problems of eutrophication of the water which can reduce water clarity and quality, creating a hypoxic or anoxic ‘dead zone' lacking sufficient oxygen to support most organisms. In the present study, the sudden mortality of black-band myleus Myloplus schomburgkii Jardine, 1841 drove the investigate of factors that caused the death of the specimens registered in a fish pond in the Peruvian Amazon. After the tallying of dead fish, it was revealed that sixty individuals (75% of the total population) of M. schomburgkii had died. The taxonomic identification of the aquatic plant revealed the presence of “duckweeds” locally named in Peru as “lenteja de agua” Lemna minor distributed throughout the pond. Physical and chemical water parameters revealed low levels of oxygen, acid water, and high levels of nitrate and phospha...

Ponds covered with duckweeds release nutrients rapidly, causing problems of eutrophication of the water which can reduce water clarity and quality, creating a hypoxic or anoxic ‘dead zone' lacking sufficient oxygen to support most organisms. In the present study, the sudden mortality of black-band myleus Myloplus schomburgkii Jardine, 1841 drove the investigate of factors that caused the death of the specimens registered in a fish pond in the Peruvian Amazon. After the tallying of dead fish, it was revealed that sixty individuals (75% of the total population) of M. schomburgkii had died. The taxonomic identification of the aquatic plant revealed the presence of “duckweeds” locally named in Peru as “lenteja de agua” Lemna minor distributed throughout the pond. Physical and chemical water parameters revealed low levels of oxygen, acid water, and high levels of nitrate and phospha...

In the rearing of native fish of the Peruvian Amazon such as Colossoma macropomum, Piaractus brachypomus, Brycon amazonicus, Prochilodus nigricans and Arapaima gigas, balanced feed is used, in whose formulation fishmeal and other non‑local inputs predominate. This makes its acquisition more expensive and difficult, mainly by rural Amazonian producers who are far from the urban area. Worldwide, there are experiences of alternatives for raising fish based on the use of vegetables, fruits and insects, taking advantage of the biological diversity of the environment. Thus, the use of insect larvae constitutes a promising alternative for the aquaculture sector on a global scale. The present study shows the semi‑captivity breeding of Hermetia illucens "black soldier fly" using organic waste (citrus) collected from urban and rural areas, highlighting the use of orange bagasse and grapefruit ...

In the rearing of native fish of the Peruvian Amazon such as Colossoma macropomum, Piaractus brachypomus, Brycon amazonicus, Prochilodus nigricans and Arapaima gigas, balanced feed is used, in whose formulation fishmeal and other non‑local inputs predominate. This makes its acquisition more expensive and difficult, mainly by rural Amazonian producers who are far from the urban area. Worldwide, there are experiences of alternatives for raising fish based on the use of vegetables, fruits and insects, taking advantage of the biological diversity of the environment. Thus, the use of insect larvae constitutes a promising alternative for the aquaculture sector on a global scale. The present study shows the semi‑captivity breeding of Hermetia illucens "black soldier fly" using organic waste (citrus) collected from urban and rural areas, highlighting the use of orange bagasse and grapefruit ...

Poecilia reticulata (Peters, 1859), popularly known as the guppy, is a small fi sh commonly confined to the shallow edges of pools and streams and also found in heavily polluted water bodies. In natural and artificial environments, this fish species can be infected by a wide range of pathogens and parasites. In the present study, we reported for the first time in the Peruvian Amazon, the infestation of metacercariae of Clinostomum marginatum (Rudolphi, 1819) in the body of specimens of P. reticulata. Between May and June 2024, fifty specimens of P. reticulata were collected from an urban stream in the city of Iquitos, Loreto, Peru. Samples were collected at the “Laboratorio de Parasitolog.a y Sanidad Acuícola” from the “Instituto de Investigaciones de la Amazon.a Peruana” (IIAP) in Loreto, Peru. Metacercariae of C.marginatum were observed embedded in the muscle tissue of 100% of...