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Reproductive biology, embryo and early larval morphology, and development rates of krill (Euphausia lamelligera and Euphausia distinguenda), endemic to the Eastern Tropical Pacific

2015; Inter-Research; Volume: 1; Issue: 2 Linguagem: Inglês

10.3354/sedao00014

2195-2744

Israel Ambriz-Arreola, Jaime Gómez‐Gutiérrez, MC Franco-Gordo, Eva R. Kozak,

Marine Bivalve and Aquaculture Studies

SEDAO Sexuality and Early Development in Aquatic Organisms Contact the journal Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections SEDAO 1:143-161 (2015) - DOI: https://doi.org/10.3354/sedao00014 Reproductive biology, embryo and early larval morphology, and development rates of krill (Euphausia lamelligera and Euphausia distinguenda), endemic to the Eastern Tropical Pacific Israel Ambriz-Arreola1,2,*, Jaime Gómez-Gutiérrez2, María del Carmen Franco-Gordo1, Eva R. Kozak1 1Centro de Ecología Costera, Universidad de Guadalajara, Gómez Farias 82, San Patricio Melaque, Jalisco CP 48980, Mexico 2Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Departamento de Plancton y Ecología Marina, Ave. IPN S/N, Col. Playa Palo de Santa Rita, La Paz, Baja California Sur CP 23096, Mexico *Corresponding author: rayamaris@gmail.com ABSTRACT: The reproductive biology and early life phases of tropical broadcast spawning krill are largely unknown worldwide. This investigation provides the first published data on the reproductive period, brood size, embryo and nauplius-to-metanauplius morphology, biometry, development, and hatching success rates of two of the smallest krill species known (Euphausia lamelligera, <11 mm and E. distinguenda, 66%) with the shortest hatching times (9 to 14 h) known so far for any species of the Order Euphausiacea. E. distinguenda was significantly larger than E. lamelligera at each early larval stage. A pseudometanauplius stage (molting between nauplius and metanauplius stages), previously thought to be an exclusive stage of sac-spawning species, was observed for both broadcast spawning species. Our results support the hypothesis that both species exhibit a continuous but seasonally variant spawning reproductive strategy associated with female body size and seasonal coastal upwelling dynamics, and show brood sizes within the low range of variability known for temperate krill species. KEY WORDS: Euphausia lamelligera · Euphausia distinguenda · Embryogenesis · Nauplius · Development times · Reproductive biology · Eastern Tropical Pacific Full text in pdf format Supplementary material PreviousNextCite this article as: Ambriz-Arreola I, Gómez-Gutiérrez J, Franco-Gordo MC, Kozak ER (2015) Reproductive biology, embryo and early larval morphology, and development rates of krill (Euphausia lamelligera and Euphausia distinguenda), endemic to the Eastern Tropical Pacific. Sex Early Dev Aquat Org 1:143-161. https://doi.org/10.3354/sedao00014 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in SEDAO Vol. 1, No. 2. Online publication date: July 22, 2015 Print ISSN: 2195-2736; Online ISSN: 2195-2744 Copyright © 2015 Inter-Research.