Maturation, fecundity and seasonality of reproduction of two commercially valuable cuttlefish, Sepia pharaonis and S. dollfusi, in the Suez Canal

Gabr, Howaida R.; Hanlon, Roger T.; Hanafy, Mahmoud; El-Etreby, Salah G.

doi:10.1016/s0165-7836(98)00107-6

Cited by 64 publications

(63 citation statements)

References 12 publications

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“…A maturity stage was assigned visually using a universal maturity scale adapted for cuttlefish by Arkhipkin (1992). Gonadosomatic indices (GSIs) of both sexes were calculated for each sampling period (GSI = (GW/TW) × 100) (Gabr et al, 1998). Subadult and adult large female cuttlefishes were then dissected and the ovary and oviducts were excised; out of 26, 4 were stage II, 5 were stage III, 5 were stage IV, and 12 were stage V. Potential fecundity (PF) of females was calculated as the sum of the oocytes in the ovary plus the eggs in the oviduct.…”

Section: Methodsmentioning

confidence: 99%

Reproductive biology of pink cuttlefish Sepia orbignyana in the Aegean Sea (eastern Mediterranean)

Dursun¹,

Eronat²,

Akalin³

et al. 2013

Turk J Zool

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Section: Methodsmentioning

confidence: 99%

Reproductive biology of pink cuttlefish Sepia orbignyana in the Aegean Sea (eastern Mediterranean)

Dursun¹,

Eronat²,

Akalin³

et al. 2013

Turk J Zool

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“…Gonads and accessory glands were weighed to the nearest 0.0001 g. All oocytes from the ovary and the oviduct were separately counted and measured along the major axis to the nearest 0.1 mm. Gonadosomatic indices (GSI) of both sexes were calculated for each sampling period (GSI = [GW/BW] x 100) (Gabr et al, 1998), and reproductive system indices (RSI), as a ratio between reproductive system mass (RSM) and body mass (BM) (RSI = [RSM/BM] x 100) Önsoy et al (2008). Potential fecundity (PF) of mature females was computed as the sum of the oocytes in the ovary plus the eggs in the oviduct.…”

Section: Methodsmentioning

confidence: 99%

Reproductive biology of <i>Neorossia caroli</i> (Cephalopoda: Sepiolidae) in the Aegean Sea

Salman¹

2010

Sci. Mar.

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SUMMARY: A total of 171 specimens of Neorossia caroli were collected by monthly sampling using a bottom trawl with 44-mm mesh size. The depth range of trawls varied between 150 and 550 m. The maximum size (dorsal mantle length, ML) was 41 mm for males and 50 mm for females. Seasonal gonadal stages of both sexes were examined using a gonadosomatic index. It has been observed that the pattern of ovulation of N. caroli is asynchronous and that spawning is continuous. The potential fecundity of females ranged between 317 and 685 oocytes (mean 548). As for males, the number of spermatophores per individual varied between 50 and 71 (mean 61). The smallest female with mature oocytes in the oviduct was 36 mm ML, while the smallest mature male with spermatophores was 20 mm ML. A peak in maturity was observed between July and September. Females appeared to reach larger sizes than males.Keywords: Neorossia caroli, fecundity, reproductive biology, Aegean Sea. RESUMEN: Biología reproductiva de Neorossia caroli (Cephalopoda: Sepiolidae) en el mar Egeo. -Se realizó un muestreo mensual con red de arrastre de fondo, cuyo tamaño de mallas en el copo fue de 44 mm, en el mar Egeo en el cual se recolectaron 171 ejemplares de Neorossia caroli. El rango de profundidad de los arrastres varió entre 150 y 550 m. El tamaño máximo (longitud dorsal del manto, LM) fue de 41 mm para los machos y de 50 mm para las hembras. Se examinó la variación estacional de los estadios gonadales de ambos sexos mediante un índice gonadosomático. Se ha observado que el patrón de ovulación de N. caroli es asincrónico y que su freza es continua. La fecundidad potencial de las hembras varió entre 317 y 685 ovocitos (media 548), variando entre 50 y 71 espermatóforos (61 en promedio) en el caso de los machos. La hembra más pequeña con ovocitos maduros en el ovario midió 36 mm de LM, mientras que el macho maduro más pequeño con espermatóforos fue de 20 mm de LM. Se observó la existencia de un pico de puesta entre julio y septiembre. La distribución de tallas de ambos sexos mostró que las hembras alcanzan mayores tamaños que los machos.

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“…Gonadosomatic indices (GSI) for females were calculated with GSI = (GW (including ovary weight and oviduct weight) / BW) x 100 for females and GSI = (GW (gonad weight) / BW) x 100) (except spermatophoric complex) for males (Gabr et al, 1998). All spermatophores collected from 10 mature males (ML= 36-54 mm) were counted, and 40 spermatophores were measured from each specimen.…”

Section: Methodsmentioning

confidence: 99%

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Salman¹

2015

Turk. J. Fish. Aquat. Sci.

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Reproductive biology of Mediterranean cuttlefish Sepia elegans has been studied in the Aegean Sea from total of 924 animals (432 males, 492 females) caught during monthly trawl surveys from May 2008 to April 2009. Cuttlefishes were measured, weighed, maturity assessed, and reproductive systems were removed and investigated in the lab. The size at maturity (ML 50 ) were 42 mm (males) ML and 41mm ML (females) respectively. Seasonal changes in a gonadosomatic index suggest extended reproductive period of the population with two peaks of spawning; once in July and in October. The ovulation pattern of S. elegans is asynchronous and spawning occurs continuously. The female potential fecundity was 513-1190. The spermatophore counts for mature males ranged 167-486. Size of adult individuals in the East Mediterranean was smaller than that in the Western Mediterranean probably due to lower productivity and high temperatures (hence expenses on metabolism).

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Maturation, fecundity and seasonality of reproduction of two commercially valuable cuttlefish, Sepia pharaonis and S. dollfusi, in the Suez Canal

Cited by 64 publications

References 12 publications

Reproductive biology of pink cuttlefish Sepia orbignyana in the Aegean Sea (eastern Mediterranean)

Reproductive biology of pink cuttlefish Sepia orbignyana in the Aegean Sea (eastern Mediterranean)

Reproductive biology of <i>Neorossia caroli</i> (Cephalopoda: Sepiolidae) in the Aegean Sea

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