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Faster position are probably a result of opportunity sink from the spawning affairs



Faster position are probably a result of opportunity sink from the spawning affairs

The massive variances on W-L relationships to possess wahoo and you will dolphinfish were a result of the fresh amount of better-conditioned-to-poor-conditioned anyone on examples

Predicated on observation away from captive Baptist dating dolphinfish you to definitely appeared to spawn the next day at the latest National Marine Fisheries Services Kewalo Lookup Facility, weight shed of the good mating partners are obviously visible changes 2 days from spawning. A healing out of condition was also observed if the mating couples was split up. (7)

New vintage modal years from inside the condition (LeCren, 1951) noticed in Their state-stuck wahoo (Fig. 10) and you may tip regarding bimodality on the condition basis regarding dolphinfish (Fig. 6, 7) have an interesting link to habits out-of seasonal wealth away from these kinds when you look at the Hawaii fisheries. Wahoo catch for every single journey possess you to definitely form while in the Get-September for all about three fisheries, whereas dolphinfish catch for each trip on The state longline, troll, and you can handline fisheries is actually bimodal, peaking on their large inside the April and higher again through the October-November. (8,9) This new seasonality of one's catch decorative mirrors this new connect rates, and though there can be interannual version inside development, the typical trend is actually observed during the many years of this research. (2)

Swordfish position was high inside the February-March (early in the spawning several months) which can be lower within the an excellent mais aussi al

The condition and you may wealth of wahoo appear to be linked to an easy annual reproductive course. Ovaries collected from around area of the Destinations and also at the fresh edge of the banks throughout the Northwestern Hawaiian islands have oocytes having yolk globules, oocytes which had began to moisturize, or possess blog post ovulatory follicles during the summer weeks. Into the Sep, oocytes during the ovaries are in the brand new atretic stage (10) showing the end of the new spawning seasons. The condition of wahoo is highest in may up until the spawning season and you will declines through the spawning year getting the very least inside the July-August (Fig. 10). Connect peaked in summer, in the spawning 12 months, suggesting you to wahoo get assemble close to the isles in order to spawn.

Including a pattern is even observed in central North Pacific swordfish, Xiphias gladius, and that spawn around the isles and large finance companies of Hawaiian archipelago (De). , 1999). Brand new The state longline fishery for swordfish comes after the fresh intensity of seafood regarding the subtropical overlap far northern of the countries in the January-February off closer to the islands throughout the February-Will get (Bigelow et al., 1999). Truly the only appreciable density off swordfish from inside the coastal Hawaii fisheries next happens in Summer. (8) That it development during the hook costs ways a southward reproductive migration through the the original half a year of the year (De). For the remainder of the year swordfish try scarce up to they come once again much with the northern within sub-cold convergence during the November-December (Bigelow et al., 1999).

I postulate one to migration related to reproduction may also explain particular of one's seasonality in hook pricing out-of wahoo close to the Hawaiian Isles. Eight wahoo ovaries collected > 50 mi. (>93 kilometres) of coastline was basically undeveloped or even in early development stages. (10) The newest density regarding wahoo larvae inside plankton tows within this 15 mi. (twenty-eight kilometer) out-of coastline of the isles in the main Hawaiian islands has actually been advertised during the Summer-Sep because of the Miller mais aussi al. (1979) by Boehlert and Mundy (1996). It would appear that wahoo may move on unlock water to help you the islands and you may banks to replicate and leave the hawaiian islands and you can finance companies to pass through in the wild sea. Skin currents (11) and you may eddies made on the area gets (Wyrtki et al., 1967; Patzert, 1969; Barkley, 1972) try elements that could transportation larvae and you can juveniles into discover water.


樋口 豪大
樋口 豪大
株式会社イノセンティブ インターン
1994年3月生まれ。日本大学理工学部4年。現在は株式会社イノセンティブでインターン、学生団体SWITCHに所属するなど精力的にコミュニティへ参加。うちなーMUSICフェスタ2015 in 赤坂BLITZのスタッフを行うなどイベント活動も積極的に行っている。

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