Home Articles List Article Information
Egyptian Journal of Aquatic Biology and Fisheries
Journal Archive
Volume Volume 29 (2025)
Volume Volume 28 (2024)
Volume Volume 27 (2023)
Volume Volume 26 (2022)
Volume Volume 25 (2021)
Volume Volume 24 (2020)
Volume Volume 23 (2019)
Volume Volume 22 (2018)
Volume Volume 21 (2017)
Volume Volume 20 (2016)
Volume Volume 19 (2015)
Volume Volume 18 (2014)
Volume Volume 17 (2013)
Volume Volume 16 (2012)
Volume Volume 15 (2011)
Volume Volume 14 (2010)
Volume Volume 13 (2009)
Volume Volume 12 (2008)
Volume Volume 11 (2007)
Volume Volume 10 (2006)
Volume Volume 9 (2005)
Volume Volume 8 (2004)
Volume Volume 7 (2003)
Volume Volume 6 (2002)
Volume Volume 5 (2001)
Volume Volume 4 (2000)
Volume Volume 3 (1999)
Volume Volume 2 (1998)
Volume Volume 1 (1997)
Gabr, H., Riad, R. (2008). Reproductive biology and morphometric characters of the Squid Loligo forbesi (Cephalopoda: Loligindae) in the Suez bay. Red Sea,Egypt. Egyptian Journal of Aquatic Biology and Fisheries, 12(1), 59-73. doi: 10.21608/ejabf.2008.1972
Howaida Gabr; Rafik Riad. "Reproductive biology and morphometric characters of the Squid Loligo forbesi (Cephalopoda: Loligindae) in the Suez bay. Red Sea,Egypt". Egyptian Journal of Aquatic Biology and Fisheries, 12, 1, 2008, 59-73. doi: 10.21608/ejabf.2008.1972
Gabr, H., Riad, R. (2008). 'Reproductive biology and morphometric characters of the Squid Loligo forbesi (Cephalopoda: Loligindae) in the Suez bay. Red Sea,Egypt', Egyptian Journal of Aquatic Biology and Fisheries, 12(1), pp. 59-73. doi: 10.21608/ejabf.2008.1972
Gabr, H., Riad, R. Reproductive biology and morphometric characters of the Squid Loligo forbesi (Cephalopoda: Loligindae) in the Suez bay. Red Sea,Egypt. Egyptian Journal of Aquatic Biology and Fisheries, 2008; 12(1): 59-73. doi: 10.21608/ejabf.2008.1972

Reproductive biology and morphometric characters of the Squid Loligo forbesi (Cephalopoda: Loligindae) in the Suez bay. Red Sea,Egypt

Article 5, Volume 12, Issue 1, January 2008, Page 59-73  XML PDF (1.23 MB)
Document Type: Original Article
DOI: 10.21608/ejabf.2008.1972
View on SCiNiTO View on SCiNiTO
Authors
Howaida Gabr1; Rafik Riad2
1Department of Marine Sciences, Faculty of Sciences, Suez Canal University, lsmailia. Egypt.
2National Institute of Oceanography and Fisheries, Alexandria, Egypt
Abstract
Reproductive biology and morphometric variation of male and female Loligo forbesi were investigated from samples obtained from commercial catches in Suez bay. The samples were collected seasonally between 2005 and 2006. The results of sex ratio indicated that females outnumber males during peak periods of reproduction. Based upon morphological features of the gonads, three maturity stages were described in both sexes. Depending on the proportion of each maturity stages as well as various maturity indices (gonad somatic index, GSI and nidamental gland index. NG1) the spawning season was found to take place during spring and early summer. Sexual dimorphism is evident in L. forbesi, where the males grow more rapidly than do females and achieve larger sizes. The mean size at maturity was 106 and 104 mm dorsal mantle length (DML) for males and females respectively. Potential fecundity estimates were obtained by counting eggs and ova in the oviduct and ovary of mature females and were in the range of 4985 to 12427 (mean = 9633±1555). There was a weak relationship between ova number and mantle length but a reasonable positive correlation was reported. The ovaries of mature females contained eggs of various sizes, indicating that spawning probably occurs intermittently. Comparisons of external morphometric characters between males and females of L. forbesi indicated a high overlapping between the sexes. Sexual dimorphism was limited to few measurements,
Keywords
Loligo forbesi; Reproductive biology; Morphometric characters; Suez Bay
Main Subjects
Fisheries
Statistics
Article View: 469
PDF Download: 760