Reproductive biology of the female Japanese mantis shrimp Oratosquilla oratoria (Stomatopoda) in relation to changes in the seasonal pattern of larval occurrence in Tokyo Bay, Japan

Kodama, Keita; Shimizu, Takamichi; Yamakawa, Takashi; Aoki, Ichiro

doi:10.1111/j.1444-2906.2004.00866.x

Cited by 44 publications

(59 citation statements)

References 19 publications

(44 reference statements)

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“…Therefore, the temporal activity of the cement glands could be considered as a secondary sexual character useful for establishing the spawning season of S. mantis. On the other hand, our histological observations suggest a synchronous development of oocytes into the S. mantis ovary, where almost all oocytes are extruded simultaneously, as already observed in other stomatopods (Kodama et al 2004). Do Chi (1975) reported that each female lays a single batch of eggs giving rise to a single generation per year.…”

Section: Discussionsupporting

confidence: 81%

Fishery and life history of spot-tail mantis shrimp, <i>Squilla mantis</i> (Crustacea: Stomatopoda), in the Gulf of Cadiz (eastern central Atlantic)

Vila¹,

Sobrino²,

Jiménez³

2013

Sci. Mar.

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SUMMARY: Squilla mantis is an economically important species that is mainly caught by the Sanlucar de Barrameda bottom trawl fleet in the Gulf of Cadiz (eastern central Atlantic). Annual landings have ranged between 24 t in 1999 and 600 t in 2003, with a mean value of 269 t for the period 1984-2010. Catches have a marked seasonality, peaking in winter and showing the lowest values in summer. Larval abundance was negatively correlated with depth and distance from the coast but positively correlated with sea surface temperature. No correlation with sea surface salinity was found. The highest larval abundance was observed in June at 20-25 m depth, while adults were mostly found at 30-35 m depth. This species is mainly concentrated in the area of influence of the Guadalquivir River but is very scarce in the rest of the study area. The maturation of the ovary and the activity of the sexual accessory glands begin in early winter. The population is age-structured in three year classes and females reach first maturity within the second year class, at 23.7 mm carapace length.Keywords: Squilla mantis, fisheries, maturation, larvae, Gulf of Cadiz. RESUMEN: Pesquería e historia de vida de la galera, Squilla mantiS (CrustaCea: stomatoPoda) en el golfo de Cádiz (atlántiCo Centro-oriental). -La galera Squilla mantis es una especie de importancia económica en el Golfo de Cádiz (Atlántico Centro-oriental), capturada principalmente por la flota de arrastre de fondo de Sanlúcar de Barrameda. Los desembarcos anuales oscilaron entre 24 t en 1999 y 600 t en 2003 con un valor medio de 269 t en el periodo comprendido entre 1984 y 2010. Las capturas tienen una marcada estacionalidad, con un pico máximo en invierno y registrándose los valores más bajos en verano. La abundancia de larvas está negativamente correlacionada con la profundidad y la distancia a costa, mientras que una correlación positiva con la temperatura superficial del mar fue encontrada. No se encontró ninguna correlación con la salinidad superficial. Las mayores abundancias de larvas fueron observadas en junio en estaciones situadas a una profundidad de 20-25 m, mientras que los adultos fueron más abundantes a 30-35 m. Esta especie está principalmente concentrada en el área de influencia del río Guadalquivir, y es muy escasa en el resto del área de estudio. La maduración del ovario y la actividad de las glándulas sexuales accesorias comienzan a principio del invierno. La población está estructurada en tres clases anuales de edad, y las hembras alcanzan la primera madurez sexual dentro del segundo año, que corresponde con una longitud del cefalotórax de 23.7 mm.

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Section: Discussionsupporting

confidence: 81%

Fishery and life history of spot-tail mantis shrimp, <i>Squilla mantis</i> (Crustacea: Stomatopoda), in the Gulf of Cadiz (eastern central Atlantic)

Vila¹,

Sobrino²,

Jiménez³

2013

Sci. Mar.

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“…3a). This result suggests that the major spawning currently takes place in the summer, whereas primary spawning used to occur in the spring, at least during the 1950s to 1980s (Shimizu 2002, Kodama et al 2004, 2006c. Our calculation also showed that individuals currently derived from small spawners constituted 84% of the total recruitment.…”

Section: Discussionmentioning

confidence: 60%

“…The first seasonal peak of current spawning is primarily composed of females ≥10 cm in body length (from the base of the rostrum to the anterior edge of the median notch of the telson) and a few smaller females, whereas the second peak is dominated by smaller females (Kodama et al 2004). Small, sexually mature females (<10 cm) were first observed in the 1980s , and their proportion has since increased (Kodama et al 2004). Changes in O. oratoria life history and the body-length structure of landings over the past few decades are summarized in Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…size landed 11 cm in 1980s (Kitahara & Maki 1997) 10 cm in 2000s (Kodama et al 2006b) Min. size at maturation >10 cm before 1960s (Kubo et al 1959) 7 cm in 2000s (Kodama et al 2004) 8 cm in 1987) 50% size at maturation 7-8 cm in 2002 (Kodama et al 2004) Age at first maturation 1 yr before 1960s (Kubo et al 1959) before 1 yr in 2000s (Kodama et al 2004) Spawning season May-July before 1960s (Kubo et al 1959) May-June and July-September from 1980s to present (Kodama et al 2004 (Shimizu 2004) changed since the 1980s and compared these estimates to values from the actual population. In addition to these main objectives, our model also provided values of fishing mortalities for small and large individuals that could maintain the population.…”

Section: Introductionmentioning

confidence: 99%

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Impacts of shifts in spawning seasonality and size at maturation on the population growth of mantis shrimp in Tokyo Bay

Nakajima

Kodama²,

Horiguchi³

et al. 2010

Mar. Ecol. Prog. Ser.

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The spawning season of mantis shrimp Oratosquilla oratoria (Stomatopoda) in Tokyo Bay has changed from being unimodal (spring only) to bimodal (spring and summer).This shift in the pattern of spawning arose because reproductive maturation began to occur in smaller females, which presumably spawn in summer, and because the proportion of smaller mature females increased. Currently, recruitment appears to depend entirely on the summer cohort because of significantly lower juvenile survival in the spring cohort. In this study, we propose that the new summer spawning period and spawning by smaller-bodied individuals have supported the population. Our size-and agestructured mathematical model of O. oratoria population dynamics indicated that the number of eggs spawned in spring is lower than that in summer, and 98% of the annual recruitment is currently derived from summer spawning. The model also suggested that smaller-bodied spawners provided 84% of total recruitment and that if the proportion of smaller-bodied mature females had not increased, the population would have shown a larger decline than was observed. In reality, the stock size of O. oratoria has become extremely low, damaging the local fishery. Based on our model predictions, an efficient solution for population recovery is to reduce the mortality of small, unsalable individuals, which are currently fished and discarded.

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“…Its spawning season lasts from April to September. There are 2 spawning peaks for the population in Tokyo Bay: the early spawning season in May by large females of body length (BL) ≥ 10 cm (≥ 1 yr) and the late spawning season in August by small females of 7 ≤ BL < 10 cm (0-1 yr; Kodama et al 2004Kodama et al , 2006a) (BL is measured from the base of the rostrum to the anterior edge of the median notch of the telson). The spawning ground of O. oratoria is located in the southern part of the bay (below the line between the Tama River and Sodegaura; Ohtomi & Shimizu 1991; see Fig.…”

Section: General Life History Traits Of Oratosquilla Oratoriamentioning

confidence: 99%

Effects of hypoxia on early life history of the stomatopod Oratosquilla oratoria in a coastal sea

Kodama¹,

Horiguchi²,

Kume³

et al. 2006

Mar. Ecol. Prog. Ser.

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Bottom hypoxia is considered to be one of the factors affecting the recent stock decline of the mantis shrimp Oratosquilla oratoria in Tokyo Bay, Japan. We used field surveys of the bay to investigate the spatiotemporal pattern of bottom hypoxia and the early life history of O. oratoria, and we examined the effects of bottom hypoxia on early life history by nonparametric analyses. Bottom hypoxia in Tokyo Bay began to appear in April, occupied more than half (55 to 67%) of the whole bay area in July and August, and disappeared from November onward. Newly settled juveniles appeared in September-October in the northeastern shallow coastal area, where the hypoxic bottom water had disappeared. After the hypoxia had abated, the distribution of juveniles expanded to the southcentral deep area. Classification and regression tree analysis showed that the threshold level of bottom dissolved oxygen concentration for the existence of juveniles was 2.78 ml l -1 , implying that hypoxia restricted the spatial distribution of juveniles. A generalized additive model showed that sampling date, bottom dissolved oxygen concentration, depth, latitude, and longitude had significant effects on the occurrence of juveniles, suggesting an adverse effect of hypoxia on the time and location of settlement of O. oratoria. Our results suggest that hypoxia is directly and/or indirectly associated with mass-mortality events during early life history.

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Reproductive biology of the female Japanese mantis shrimp Oratosquilla oratoria (Stomatopoda) in relation to changes in the seasonal pattern of larval occurrence in Tokyo Bay, Japan

Abstract: The reproductive traits and the monthly larval abundance of the mantis shrimp Oratosquilla oratoria were investigated in Tokyo Bay, Japan, in 2002.

Cited by 44 publications

References 19 publications

Fishery and life history of spot-tail mantis shrimp, <i>Squilla mantis</i> (Crustacea: Stomatopoda), in the Gulf of Cadiz (eastern central Atlantic)

Fishery and life history of spot-tail mantis shrimp, <i>Squilla mantis</i> (Crustacea: Stomatopoda), in the Gulf of Cadiz (eastern central Atlantic)

Impacts of shifts in spawning seasonality and size at maturation on the population growth of mantis shrimp in Tokyo Bay

Effects of hypoxia on early life history of the stomatopod Oratosquilla oratoria in a coastal sea

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