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This paper deals with the following quasilinear Keller-Segel-Navier-Stokessystem modeling coral fertilization $(*)$: $$\left\{ \begin{array}{l}n_t+u\cdot\nabla n=\Delta n-\nabla\cdot(nS(x,n,c)\nabla c)-nm,\quad x\in\Omega, t>0, c_t+u\cdot\nabla c=\Delta c-c+m,\quad x\in \Omega, t>0,m_t+u\cdot\nabla m=\Delta m-nm,\quad x\in \Omega, t>0,\\ u_t+\kappa(u \cdot\nabla)u+\nabla P=\Delta u+(n+m)\nabla \phi,\quad x\in \Omega, t>0,\\\nabla\cdot u=0,\quad x\in \Omega, t>0 \end{array}\right.$$ under no-fluxboundary conditions in a bounded domain $\Omega\subset \mathbb{R}^3$ withsmooth boundary, where $\phi\in W^{2,\infty} (\Omega)$. Here the matrix-valuedfunction $S(x,n,c)$ denotes the rotational effect which satisfies$|S(x,n,c)|\leq S_0 (c)(1 + n)^{-\alpha}$ with $\alpha\geq0$ and somenonnegative nondecreasing function $S_0$. Based on this inequality and somecarefully analysis, if $\alpha>0$, then for any $\kappa\in\mathbb{R},$ system$(*)$ possesses a global weak solution for which there exists $T > 0$ such that$(n,c,m , u)$ is smooth in $\Omega\times( T ,\infty)$. Furthermore, for any$p>1,$ this solution is uniformly bounded in with respect to the norm in$L^p(\Omega)\times L^\infty(\Omega) \times L^\infty(\Omega)\times L^2 (\Omega;\mathbb{R}^3)$. Building on this boundedness property and some other analysis,it can finally even be proved that in the large time limit, any such solutionapproaches the spatially homogeneous equilibrium $(\hat{n},\hat{m},\hat{m},0)$in an appropriate sense, where$\hat{n}=\frac{1}{|\Omega|}\{\int_{\Omega}n_0-\int_{\Omega}m_0\}_{+}$ and$\hat{m}=\frac{1}{|\Omega|}\{\int_{\Omega}m_0 -\int_{\Omega}n_0\}_{+}$.

A new result for the global existence (and boundedness), regularity and  stabilization of a three-dimensional Keller-Segel-Navier-Stokes system  modeling coral fertilization