Some Histological Notes on the Gonads of Tapes japonica DESHAYES

Kô, Yoshio

doi:10.2331/suisan.23.394

Cited by 16 publications

(2 citation statements)

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“…By contrast, the largest shell length of R. philippinarum clams with byssus production in the field was 36.6 mm (Stn K2 in June 2018), which is well over the smallest mature shell length of this species (= ca. 15 mm) (Kô, ; Toba et al, ). Additionally, the presence of byssal glands was here observed histologically in the foot of all specimens including a sexually matured one.…”

Section: Discussionmentioning

confidence: 99%

“…If a mass‐spawning event of the populations occurred after the first clam collection, this variation in the relationship between SCI and SNSS would be explained by spawning stress in adult clams. Actually, spawning of R. philippinarum populations in western Kyushu, Japan takes place twice a year during late April to early July and during September to January (Kô, ). Unfortunately, however, we have no specimens with gonadal tissue with a few exceptions, because we focused on their byssal glands at the beginning of the present study (i.e.…”

Section: Discussionmentioning

confidence: 99%

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Byssus production ability and degree of byssal‐gland development in the infaunal clam Ruditapes philippinarum

2019

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Byssus production of Ruditapes philippinarum clams becomes reduced with growth. This tendency is well recognized but has not been analysed in detail. Additionally, it remains uninvestigated whether the lack of competence to produce byssus threads in the adult stage is caused by atrophy of the byssal glands or not. The objective of this study was to evaluate the byssus production ability of clams through the juvenile to adult stages and to examine the importance of two endogenous factors (i.e. shell size, somatic condition) in determining the byssus production probability (proportion of clams with byssus production in a population). This study also histologically confirmed the presence of byssal glands in juvenile to adult clams. For these purposes, field surveys to investigate the relationship among byssus production, shell size and somatic condition of clams collected from four intertidal sites and a histological study for byssal glands of the clams was conducted. This study revealed that byssus production probability decreases with increasing shell size and declining somatic condition and that the lack of byssus production is not caused by the loss of the byssal glands.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%