Reproductive strategy of the giant electric ray in the southern Gulf of California

María I. Burgos-Vázquez, Paola A. Mejía-Falla, Víctor H. Cruz-Escalona, Nancy J. Brown-Peterson

Research output: Contribution to journalArticle

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Abstract

© María I. Burgos-Vázquez, Paola A. Mejía-Falla, Víctor H. Cruz-Escalona, and Nancy J. Brown-Peterson. The objective of the present study was to describe and characterize macroscopic and microscopic aspects of the reproductive biology of the Giant Electric Ray Narcine entemedor, a viviparous elasmobranch targeted by commercial fishers in Mexico. A total of 305 individual rays were captured (260 females, 45 males); all males were sexually mature. The median size at maturity for females was estimated to be 58.5 cm TL, the median size at pregnancy was 63.7 cm TL, and the median size at maternity was 66.2 cm TL. The range of ovarian follicles recorded per female was 1–69; the maximum ovarian fecundity of fully grown vitellogenic oocytes was 17, and uterine fecundity ranged from 1 to 24 embryos per female. The lengths of the oblong ovarian follicles varied significantly among months, and the largest ovarian follicles were found in July, August, and September. Median embryo size was largest in August, and the size at birth was between 12.4 and 14.5 cm TL. Histological evidence of secretions from the glandular tissue of the uterine villi indicate that this species probably has limited histotrophy as a reproductive mode. Vitellogenesis in the ovary occurred synchronously with gestation in the uterus. The Giant Electric Ray has a continuous annual reproductive cycle; a period of ovulation occurs between May and September and two peaks of parturition, one in January and one in August, occur, suggesting that embryonic diapause occurs in some individuals. These results provide useful information for the management of this important commercial species in Bahía de La Paz, Mexico, and will allow possible modification of the current Mexican regulations to enable better protection of this species.
Original languageAmerican English
Pages (from-to)577-596
Number of pages20
JournalMarine and Coastal Fisheries
DOIs
StatePublished - 1 Jan 2017
Externally publishedYes

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Torpediniformes
Gulf of California
reproductive strategy
ovarian follicles
pregnancy
fecundity
embryo
embryo (animal)
Mexico
uterine tissue
commercial species
parturition
size at maturity
information management
diapause
vitellogenesis
reproductive cycle
reproductive biology
villi
secretion

Cite this

Burgos-Vázquez, María I. ; Mejía-Falla, Paola A. ; Cruz-Escalona, Víctor H. ; Brown-Peterson, Nancy J. / Reproductive strategy of the giant electric ray in the southern Gulf of California. In: Marine and Coastal Fisheries. 2017 ; pp. 577-596.
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abstract = "{\circledC} Mar{\'i}a I. Burgos-V{\'a}zquez, Paola A. Mej{\'i}a-Falla, V{\'i}ctor H. Cruz-Escalona, and Nancy J. Brown-Peterson. The objective of the present study was to describe and characterize macroscopic and microscopic aspects of the reproductive biology of the Giant Electric Ray Narcine entemedor, a viviparous elasmobranch targeted by commercial fishers in Mexico. A total of 305 individual rays were captured (260 females, 45 males); all males were sexually mature. The median size at maturity for females was estimated to be 58.5 cm TL, the median size at pregnancy was 63.7 cm TL, and the median size at maternity was 66.2 cm TL. The range of ovarian follicles recorded per female was 1–69; the maximum ovarian fecundity of fully grown vitellogenic oocytes was 17, and uterine fecundity ranged from 1 to 24 embryos per female. The lengths of the oblong ovarian follicles varied significantly among months, and the largest ovarian follicles were found in July, August, and September. Median embryo size was largest in August, and the size at birth was between 12.4 and 14.5 cm TL. Histological evidence of secretions from the glandular tissue of the uterine villi indicate that this species probably has limited histotrophy as a reproductive mode. Vitellogenesis in the ovary occurred synchronously with gestation in the uterus. The Giant Electric Ray has a continuous annual reproductive cycle; a period of ovulation occurs between May and September and two peaks of parturition, one in January and one in August, occur, suggesting that embryonic diapause occurs in some individuals. These results provide useful information for the management of this important commercial species in Bah{\'i}a de La Paz, Mexico, and will allow possible modification of the current Mexican regulations to enable better protection of this species.",
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Reproductive strategy of the giant electric ray in the southern Gulf of California. / Burgos-Vázquez, María I.; Mejía-Falla, Paola A.; Cruz-Escalona, Víctor H.; Brown-Peterson, Nancy J.

In: Marine and Coastal Fisheries, 01.01.2017, p. 577-596.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Reproductive strategy of the giant electric ray in the southern Gulf of California

AU - Burgos-Vázquez, María I.

AU - Mejía-Falla, Paola A.

AU - Cruz-Escalona, Víctor H.

AU - Brown-Peterson, Nancy J.

PY - 2017/1/1

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N2 - © María I. Burgos-Vázquez, Paola A. Mejía-Falla, Víctor H. Cruz-Escalona, and Nancy J. Brown-Peterson. The objective of the present study was to describe and characterize macroscopic and microscopic aspects of the reproductive biology of the Giant Electric Ray Narcine entemedor, a viviparous elasmobranch targeted by commercial fishers in Mexico. A total of 305 individual rays were captured (260 females, 45 males); all males were sexually mature. The median size at maturity for females was estimated to be 58.5 cm TL, the median size at pregnancy was 63.7 cm TL, and the median size at maternity was 66.2 cm TL. The range of ovarian follicles recorded per female was 1–69; the maximum ovarian fecundity of fully grown vitellogenic oocytes was 17, and uterine fecundity ranged from 1 to 24 embryos per female. The lengths of the oblong ovarian follicles varied significantly among months, and the largest ovarian follicles were found in July, August, and September. Median embryo size was largest in August, and the size at birth was between 12.4 and 14.5 cm TL. Histological evidence of secretions from the glandular tissue of the uterine villi indicate that this species probably has limited histotrophy as a reproductive mode. Vitellogenesis in the ovary occurred synchronously with gestation in the uterus. The Giant Electric Ray has a continuous annual reproductive cycle; a period of ovulation occurs between May and September and two peaks of parturition, one in January and one in August, occur, suggesting that embryonic diapause occurs in some individuals. These results provide useful information for the management of this important commercial species in Bahía de La Paz, Mexico, and will allow possible modification of the current Mexican regulations to enable better protection of this species.

AB - © María I. Burgos-Vázquez, Paola A. Mejía-Falla, Víctor H. Cruz-Escalona, and Nancy J. Brown-Peterson. The objective of the present study was to describe and characterize macroscopic and microscopic aspects of the reproductive biology of the Giant Electric Ray Narcine entemedor, a viviparous elasmobranch targeted by commercial fishers in Mexico. A total of 305 individual rays were captured (260 females, 45 males); all males were sexually mature. The median size at maturity for females was estimated to be 58.5 cm TL, the median size at pregnancy was 63.7 cm TL, and the median size at maternity was 66.2 cm TL. The range of ovarian follicles recorded per female was 1–69; the maximum ovarian fecundity of fully grown vitellogenic oocytes was 17, and uterine fecundity ranged from 1 to 24 embryos per female. The lengths of the oblong ovarian follicles varied significantly among months, and the largest ovarian follicles were found in July, August, and September. Median embryo size was largest in August, and the size at birth was between 12.4 and 14.5 cm TL. Histological evidence of secretions from the glandular tissue of the uterine villi indicate that this species probably has limited histotrophy as a reproductive mode. Vitellogenesis in the ovary occurred synchronously with gestation in the uterus. The Giant Electric Ray has a continuous annual reproductive cycle; a period of ovulation occurs between May and September and two peaks of parturition, one in January and one in August, occur, suggesting that embryonic diapause occurs in some individuals. These results provide useful information for the management of this important commercial species in Bahía de La Paz, Mexico, and will allow possible modification of the current Mexican regulations to enable better protection of this species.

U2 - 10.1080/19425120.2017.1370042

DO - 10.1080/19425120.2017.1370042

M3 - Article

SP - 577

EP - 596

JO - Marine and Coastal Fisheries

JF - Marine and Coastal Fisheries

SN - 1942-5120

ER -