Analysis of Oocyte Development and Potential Fecundity of the Squid <i>Loligo Vulgaris</i> from the Waters of Southern Portugal

Lopes, Soares; Coelho, M.L.; Andrade, J.P.

doi:10.1017/s0025315400036262

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…In the'loliginid PhotoloLigo sp., Moltschaniwskyj (1995) found primary oogonia in the ovaries of females that had oviposited. Other studies, however, indicate that spawning females of some loliginids do not always continue to form primary oogonia (Knipe & Beeman 1978, Lopes et al 1997. How females coordinate the processes of primary oogonia formation, oocyte development, fertilization, and oviposition remains an outstanding question in cephalopod research.…”

Section: Spawning Strategymentioning

confidence: 99%

Female reproductive output in the squid Loligo pealeii:multiple egg clutches and implications for a spawning strategy

Maxwell¹,

Hanlon²

2000

Mar. Ecol. Prog. Ser.

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We examined actual and potential reproductive output with particular attention to the females' abilities to lay multiple clutches of eggs. Combining the results of 2 summer spawning seasons, 28 of 47 females that laid eggs in captivity produced substantial clutches (i.e., 5 or more egg capsules per clutch) at least twice. Multiply-ovipositing females exhibited a variety of patterns of oviposition, ranging from relatively small clutches at short intervals to large clutches several weeks apart. Actual reproductive output varied greatly between females. In both years, the number of egg capsules and ova laid showed a negative relationship with the combined mass of the ovary and oviduct at the time of death. Separate correlations between the number of ova laid and the combined number of oocytes and ova remaining in the reproductive tract at death revealed a similarly negative, although statistically weaker, relationship in both years. Most importantly, the number of ova laid in captivity (mean = 11 800 in 1997 and mean = 15 293 in 1998) exceeded the combined number of ova and oocytes remaining at death (mean ca 4500 in both years) by roughly 3x, providing an inhcation of the extent to which only counting remaining oocytes and ova can underestimate fecundity. The ages of ovipositing females spanned 4 to 6 mo. Interestingly, neither age nor mantle length consistently affected reproductive output, i.e., short young females could be just as fecund as longer older females. A supplementary feeding experiment failed to demonstrate an effect of feeding regime on captive lifespan or reproductive output. The females in one year (1998) were maintained in isolation without access to males; these females laid fertilized eggs, some over periods of 15 or more days, demonstrating the use of stored sperm. For females that had oviposited in both years, the oocytes remaining in the ovary always ranged greatly in size and structure. Thus, the 'spawning strategy' of Loligo pealeii appears to involve multiple ovipositions over weeks or months, with oocytes possibly being developed continually. Placing the results of this study in a larger context, reproduction by females in this and other loliginids most likely entails copulation with multiple males and the laying of multiple clutches of eggs, possibly in different locations.

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Section: Spawning Strategymentioning

confidence: 99%

Female reproductive output in the squid Loligo pealeii:multiple egg clutches and implications for a spawning strategy

Maxwell¹,

Hanlon²

2000

Mar. Ecol. Prog. Ser.

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Batch or trickle: understanding the multiple spawning strategy of southern calamary, Sepioteuthis australis (Mollusca : Cephalopoda)

Kuipers

Pecl

Moltschaniwskyj

2008

Mar. Freshwater Res.

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Many cephalopods are ‘multiple spawners’; however, we know little about the timing and dynamics of egg production. This has implications for the allocation of energy to reproduction, lifetime fecundity and subsequent recruitment. The current study aimed to determine if Sepioteuthis australis (Quoy and Gaimard, 1832), which spawns multiple times, produces mature oocytes for deposition in a continuous trickle or in larger discrete batches. Throughout a spawning season, developmental stages were assigned to the ovaries of each female by combining macroscopic and histological analyses of the oocytes. Half of the females (46%) showed a significant peak in oocytes at one of the maturation stages, indicating that females were developing eggs in batches. It was hypothesised that the remaining females were also batch spawning, given that the oviduct weights of the remaining females (54%) were high and the other measured biological characteristics were similar to those of the females showing a peak in oocyte stage. Average batch fecundity declined over the 3-month spawning season, but total egg numbers in the ovary increased, suggesting that females might have deposited small batches more often during December. As reproduction requires large allocations of energy, understanding how females distribute reproductive effort throughout their lives is crucial to understanding the behaviour of populations, individuals and their offspring.

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Analysis of Oocyte Development and Potential Fecundity of the Squid Loligo Vulgaris from the Waters of Southern Portugal

Cited by 2 publications

References 7 publications

Female reproductive output in the squid Loligo pealeii:multiple egg clutches and implications for a spawning strategy

Female reproductive output in the squid Loligo pealeii:multiple egg clutches and implications for a spawning strategy

Batch or trickle: understanding the multiple spawning strategy of southern calamary, Sepioteuthis australis (Mollusca : Cephalopoda)

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