Embryonic and larval development of the suckermouth sailfin catfish Pterygoplichthys partialis from Marikina River, Philippines

Q3 Agricultural and Biological Sciences Eurasian Journal of Biosciences Pub Date : 2014-07-01 DOI:10.5053/ejobios.2014.8.0.4
J. Jumawan, A. Herrera, Benjamin Vallejojr
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引用次数: 3

Abstract

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 from fertilization until yolk resorption. Results: The females subjected to a single dose of HCG responded positively to treatment (97%) with higher fertilization success (88%) compared to the untreated females (21%). Nonetheless, the HCG-induced fertilized eggs had a low hatching success (49%), while from the free-living embryos successfully hatched, a high number (90%) survived to become juveniles. Embryonic development in P. pardalis was completed 168 h and 30 min after fertilization, with the total yolk resorption completed on the 8t h day post hatching, during which the suckermouth gradually shifted from rostral to ventral position to commence the loricariid algae-scraping feeding mode. Conclusions: Pterygoplichthys pardalis does not undergo a true larval metamorphosis between the free-living embryo and the juvenile stage and a definitive adult phenotype is developed directly. These results provided basic, yet essential information on the early developmental features of this invasive species whose spawning and early developmental strategies were difficult to observe in the field. Implications of some ontogenetic features in this species with regards to invasion are also discussed.
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菲律宾马里基纳河吸嘴帆鳍鲶鱼的胚胎和幼体发育
背景:为了了解这种入侵鱼类的早期生活史和对入侵的发育策略,目前关于其早期发育的信息很少。材料与方法:利用人绒毛膜促性腺激素(HCG)诱导雌性parygoplichthys pardalis产卵,研究其从受精到卵黄吸收的发育阶段。结果:接受单剂量HCG治疗的雌性对治疗有积极反应(97%),受精成功率(88%)高于未接受治疗的雌性(21%)。尽管如此,hcg诱导的受精卵的孵化成功率很低(49%),而从成功孵化的自由生活胚胎中,存活率很高(90%)。在受精后168 h 30 min完成胚胎发育,在孵化后第8天完成卵黄的完全吸收,在此期间吸吮口逐渐从吻侧移到腹侧,开始吸藻进食模式。结论:parygoplichthys pardalis在自由生活的胚胎和幼鱼阶段之间没有经历真正的幼虫蜕变,而是直接发育为确定的成虫表型。这些结果为这种在野外很难观察到的入侵物种的早期发育特征提供了基本而重要的信息。本文还讨论了该物种在入侵方面的一些个体发生特征的含义。
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来源期刊
Eurasian Journal of Biosciences
Eurasian Journal of Biosciences Agricultural and Biological Sciences-Agricultural and Biological Sciences (all)
CiteScore
1.20
自引率
0.00%
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0
期刊介绍: EurAsian Journal of BioSciences (Abbrev. Eurasia J Biosci or EJOBIOS) is an international, refereed electronic journal. It publishes the results of original research in the field of biological sciences restricted tomorphology, physiology, genetics, taxonomy, ecology and biogeography of both prokaryotic and eucaryotic organisms. The journal encourages submission of manuscripts dealing with plant biology, animal biology, plant physiology, microbiology, hydrobiology, ecology and environmental science, ethnobiology, biodiversity and conservation biology. EurAsian Journal of BioSciences publishes original articles in the following areas: -Agriculture, Fisheries & Food -Anatomy & Morphology -Behavioural Sciences -Biology, Biochemistry and Biotechnology -Biophysics -Biology Education -Cellular Biology and Anatomical Sciences -Ecology, Evolution & Environment -Entomology -Forestry -General Biology -Genetics & Heredity -Life Sciences - Other topics -Microbiology and Immunology -Molecular Biology -Mycology -Palaeontology -Parasitology -Pharmacology & Pharmacy -Physiology and Related Sciences -Plant Sciences -Toxicology -Veterinary Sciences -Virology -Zoology
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