Joycelyn Cagatin Jumawan

Joycelyn Cagatin Jumawan
Caraga State University | CSU · Biology Department

6.76
 · 
Ph.D. Biology

About

19
Publications
11,828
Reads
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73
Citations
Research Experience
June 2007 - present
Caraga State University
Position
  • Associate Professor

Publications

Publications (19)
Article
The histological and ultrastructural features of the testis of the invasive suckermouth sailfin catfish Pterygoplichthys disjunctivus rapidly proliferating in Marikina River, Philippines were characterized during the fish's 2010-2011 reproductive season. The germinal compartment of the testes was composed of anastomosing tubules with cysts undergoi...
Article
Full-text available
The ovarian histomorphology during the annual reproductive cycle of the non-native suckermouth sailfin catfish, Pterygoplichthys disjunctivus (Weber 1991), a highly invasive and dominant fish population in Marikina River, Philippines was described from July 2010 to June 2011. Six ovary development stages were described with defined oocyte diameters...
Article
Lipid peroxidation and patterns of cadmium and lead accumulation in the gills, liver, gut and muscles of Pterygoplichthys Gill, 1858 from four stations in Marikina River, Philippines were analyzed to study effects of possible metal toxicity alongside stress response. Mean cadmium (Cd) concentrations from tissues studied are within permissible amoun...
Article
Full-text available
Length-weight relationships (LWRs) of 16 fish species caught from eight floodplain lakes of Agusan Marsh in the Philippines in January 2014-2015 are reported. The species collected belong to nine families and were mostly introduced to the country. Samples were collected using five types of fishing gear. The " b " values in the LWR W= aL b ranged fr...
Article
The effects of solo and combinatorial exposure to ethanolic extract of Annona squamosa Linn. leaves and mercuric acetate (MA) were studied in gestating ICR mice and their fetuses in-utero. Results show that mercuric acetate significantly increased maternal mortality and fetal resorption index while inducing decreased fetal size. Exposure of mercuri...
Article
Full-text available
Clarias macrocephalus Günther, 1864 is a Near Threatened freshwater catfish found in the Philippines and other Southeast Asian countries. Its numbers have dwindled over the past few years because of habitat loss and competition. This study examined the genetic diversity of the remaining viable populations of C. macrocephalus in the Philippines. Pri...
Article
Full-text available
The length-weight relationships (LWR), sex ratio and gonado-somatic index (GSI) of the suckermouth sailfin catfish Pterygoplichthys disjunctivus caught in 2010-2011 from Marikina River, Philippines was reported to provide information essential for management of this invasive species in non-native ranges. Pooled LWRs for males and females was expres...
Article
Pterygoplichthys spp., locally known as janitor fish, has been documented to have spread all over the freshwater habitat of the Philippines. It is now threatening the delicately balanced freshwater ecosystem of Agusan River, the third largest river in the Philippines. This species is believed to be exported as an aquarium pet and accidentally escap...
Article
Full-text available
Lake Mainit is the deepest lake in the Philippines. Nonetheless, cases of schistosomiasis were also reported in several communities surrounding the lake adding to concern to the tourism in the area. This gastropod survey was conducted in ten barangays surrounding Lake Mainit to provide an inventory of gastropods and their possible preference to hab...
Article
Full-text available
Catfishes of the genus Clarias are important food fishes in aquaculture. In the Philippines, six species are documented but only three, namely C. batrachus, C. macrocephalus, and C. gariepinus, are found in the market today. Of these, C. macrocephalus is both native and near threatened. In this study, the cytochrome c oxidase I (COI) gene was ampli...
Conference Paper
Mercury analyses of fish muscles of select bioindicator fish species and sediments in the Tambis River System, Barobo and Hinatuan, Surigao del Sur was determined between index seasons (dry and wet) of 2014 to trace mercury content in fishes and sediments near areas practicing artisanal small scale gold mining. Three species of bioinicator fishes w...
Article
This study aimed to assess the diversity of aquatic macroinvertebrates and its implications towards the water quality of Gibong River, Philippines. Riparian, Channel Environmental (RCE) inventory was undertaken to describe the integrity of the riparian vegetation. Selected physicochemical parameters were determined to support the presence of bioind...
Article
This study investigated the effects of sub-acute (70 mg/L) lead chloride (PbCl2) exposure on the vital organs of the suckermouth sailfin catfish Pterygoplichthys pardalis, a species known to thrive in polluted freshwaters. Histological observations in the gills show thickened lamellar epithelium and distinct thrombosed telangiectatic secondary lame...
Article
It has been reported that the water fruit extract of Calabash (Crescentia cujete) have many traditional claims for herbal medicine. However the safety of its use during pregnancy has not been fully investigated. The ethanolic fruit extract (25%, 75%, and 100%) was given to Sprague Dawley rats on days 6 to 19 of gestation, that is, organogenetic per...
Article
Full-text available
Macroinvertebrates have been utilized to monitor water bodies to evaluate water quality and complement water quality surveys. The physico-chemical features of four freshwater bodies near nickel mining activity was assessed using selected physico-chemical parameters in combination with macroinvertebrate composition scoring and diversity indices. Res...
Article
Full-text available
The study was conducted in order to establish and describe the mangrove community and vegetation of the mangrove forest in Alabel and Maasim, Sarangani province. It was evident that the studies for mangrove vegetation were really few in Sarangani bay. Thus, this study will serve as baseline information. Sampling plots (10m x 10m) were established i...
Article
Full-text available
Background: There is little information about the early development of this invasive fish species in order to understand its early life history and developmental strategies towards invasion. Material and Methods: Female Pterygoplichthys pardalis were induced to spawn using human chorionic gonadotropin (HCG) so as to study the developmental stages...
Article
Full-text available
DNA barcoding for accurate identification of invasive alien fish species is relatively unexplored. In this study, partial sequence (655 bp) of the mitochondrial gene COI (cytochrome c oxidase subunit I) was used to delineate between two species of exotic suckermouth sailfin catfish Pterygoplichthys – P. pardalis and P. disjunctivus and their interg...

Questions and Answers

Question & Answers (4)
Question
Hi everyone! Are there studies that point out possibilities for new and bigger sized snail vectors for schistosomiasis? Is it possible for schistosomes to adapt and transfer to bigger sized new vectors for their sporocyst and cercarial stages than the known vectors such as Oncomelania or Biomphalaria?

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