Motupore Island Research Centre, University of Papua New Guinea, University 134, National Capital District, Papua New Guinea.
J Fish Biol. 2009 Mar;74(4):806-19. doi: 10.1111/j.1095-8649.2008.02158.x.
Population structure and life-history variables of the widely distributed alligator pipefish Syngnathoides biaculeatus were characterized in Bootless Bay, Papua New Guinea over the course of 11 months. There was little evidence of seasonality with four focal populations showing no significant change in abundance. Similarly, the sex ratio remained 1:1 for all but 1 month. Reproductive males carrying eggs (148-278 mm in total length, L(T)) were found in all months. Brood size was significantly, positively related to male L(T) for newly laid broods only. Maximum observed brood size was 351 and mean +/-s.d. brood size was 238 +/- 57 for newly laid broods. Juveniles and males showed no change in mean L(T) over the year while slightly smaller females were captured in November 2006 and September 2007. Males were significantly longer than females so von Bertalanffy growth coefficients were estimated separately for each sex: males L(infinity)= 285 mm, K = 0.82 year(-1) and females L(infinity)= 261 mm, K = 1.10 year(-1). These estimates suggest that this species grows rapidly and has a short-life span. In the context of growing concern about overexploitation of syngnathids, a rapid growth rate combined with year round reproductive activity suggests that the tropical S. biaculeatus may be relatively resilient with regard to fishing pressure.
在巴布亚新几内亚的布塔斯湾，研究人员对广泛分布的尖鼻海龙的种群结构和生活史变量进行了为期 11 个月的研究。研究结果表明，尖鼻海龙的种群数量并没有明显的季节性变化，四个重点研究种群的数量都没有显著变化。同样，除了一个月之外，雌雄比例一直保持在 1:1。所有月份都发现了携带卵子（全长 148-278 毫米，L(T)）的繁殖雄性个体。只有新产下的鱼卵数量与雄性个体的全长呈显著正相关。新产下的鱼卵最大观察到的窝卵数为 351，平均窝卵数为 238 +/- 57。在这一年中，幼鱼和雄性个体的平均全长没有变化，而 2006 年 11 月和 2007 年 9 月捕获的雌性个体则略小。雄性个体的全长明显长于雌性个体，因此分别为雌雄个体估计了 von Bertalanffy 生长系数：雄性个体 L(infinity)= 285 毫米，K = 0.82 年(-1)，雌性个体 L(infinity)= 261 毫米，K = 1.10 年(-1)。这些估计表明，该物种生长迅速，寿命较短。在人们对过度捕捞海龙科鱼类的担忧日益增加的背景下，快速的生长速度加上全年的繁殖活动表明，热带尖鼻海龙在面临捕捞压力时可能具有相对的弹性。
