Abstract
The Portuguese oyster (Crassostrea angulata) is an important fishery resource in Taiwan. This study investigated oyster cultures at two locations along the coast of Taisi Township from March 2012 to July 2014. The average recruitment density, measured once every two weeks, of the oyster larvae was 256.4 ± 236.6 individuals/shell (N = 62) at site A and 118.5 ± 140.2 individuals/shell (N = 39) at site B. The average adherence density of the barnacle larvae was 187.1 ± 251.2 individuals/shell (N = 60) at site A and 60.9 ± 112.5 individuals/shell (N = 37) at site B. In Taiwan, C. angulata spawned all year. The primary spawning season was from March to September. The primary of adherence spawning season of barnacles was from March to October. Rainfall was the major factor that influenced oyster C. angulata and barnacle settlement, the eigenvalue of PC1 was 1.83 and could explain 61.0%. There are two main culturing seasons that move oyster larvae from coast of Taisi to farms in other places: from March to May and from August to September. Although the oyster larvae are more abundant in spring, fishermen prefer harvesting the larvae in autumn to avoid the typhoon season (July-September).
Highlights
IntroductionThe Pacific oyster Crassostrea gigas (Thunberg 1793) is a well-known commercial oyster cultivated in many countries and areas, including the United Kingdom, Japan, Korea, Australia, and Taiwan [3]-[8]
The oysters were recognized as C. angulata, and the barnacles were classified into two species, Amphibalanus amphitrite (Darwin 1854) and A. reticulatus (Utinomi 1967)
Karuppaiyan and Raja (2007) reported that the adherence season of oyster larvae in southeast India was from September through May, except for the coldest days in December [59] (Karuppaiyan and Raja 2007)
Summary
The Pacific oyster Crassostrea gigas (Thunberg 1793) is a well-known commercial oyster cultivated in many countries and areas, including the United Kingdom, Japan, Korea, Australia, and Taiwan [3]-[8]. The Pacific oyster and the Portuguese oyster Crassostrea angulata (Lamarck 1819) were considered a single species until recently when molecular biology studies proved otherwise [9]-[15]. The Pacific oyster is native to temperate waters close to Japan and Korea, whereas the Portuguese oyster is found in the waters surrounding Taiwan [16] [17]. The Portuguese oyster has a wide distribution in subtropical Taiwan and southern China [15] [16] [20] [21] [22] [23]
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